Cases

In recent years, Direct-to-Grid High-Voltage Energy Storage has emerged as a promising technical path in the energy storage industry. As a company committed to innovation in power electronics and energy storage, FGI continues to develop efficient, safe, and scalable solutions. This article explores the fundamentals, benefits, and development trends of this technology from an FGI perspective. 1. What Is Direct-to-Grid High-Voltage Energy Storage? High-voltage direct-connect energy storage is a novel system architecture that connects the energy storage system directly to medium or high-voltage grids (e.g., 6kV, 10kV, or 35kV) through a cascaded topology of power modules—without the need for step-up transformers. In contrast, traditional centralized or string-type systems connect battery clusters to a low-voltage DC bus, then convert it to low-voltage AC via PCS, and finally use a transformer to reach grid-level voltages. The direct-to-grid approach eliminates the transformer by connecting multiple modular units (each with a power converter and battery cluster) in series, achieving grid voltage levels through cascaded output. 2. Core Advantages of High-Voltage Direct-Connect Storage A. Higher Efficiency and Reliability Reduced energy losses: Eliminating the transformer avoids iron and copper losses, along with long-distance cable loss. Overall system efficiency may increase by 2% or more, depending on system design. Improved power quality: Multilevel converter topologies ensure higher waveform quality and better grid adaptability. The system can provide rapid and precise reactive power support, enhancing transient voltage stability. Enhanced system reliability: The architecture avoids the single-point-of-failure risk of centralized PCS designs, improving fault tolerance and resilience. B. Greater Flexibility and Scalability Battery-level adaptability: Fine-grained cluster-level control enables mixing different brands or capacities of battery packs within a single system. Modular scalability: System voltage and power capacity can be adjusted by simply increasing or decreasing the number of series-connected modules. 3. Future Trends and Remaining Challenges As storage projects scale up to hundreds of megawatts, low-voltage architectures face limitations—such as insufficient AC segmentation, DC arcing, and loop currents—jeopardizing both safety and efficiency. High-voltage direct-connect storage, with its streamlined architecture and superior performance, is increasingly regarded as a preferred solution for large-scale grid-side and renewable base storage applications. However, the technology still faces challenges in system control, fault protection, and module-level stability. Nonetheless, driven by supportive policies, growing market demands, and technical advancements, its development is accelerating. At FGI, we are actively exploring the practical implementation of direct-to-grid high-voltage storage systems, aiming to support a smarter, more resilient, and cleaner energy future. Reach out to us for a free evaluation and tailored solution: E-mail: overseas@fengguang.com Add: Jincheng Road, Economic Development Zone, Wenshang County, Shandong Province, China.

FGI's Static Var Generator (SVG) continues to provide reliable solutions across a wide range of industrial scenarios. From ferroalloy production to renewable energy integration, FGI SVG ensures stable voltage, improved power factor, and compliance with national power quality standards. Below are three newly implemented SVG application cases across China. Case 1: Ferroalloy Furnace Application in Zhengzhou, Henan Location: Zhengzhou City, Henan ProvinceCompensation Capacity: -2000kvar to +2000kvarSystem Voltage: 6kV Load Characteristics:Compared to arc furnaces, ferroalloy (submerged arc) furnaces are more stable. However, the site encountered serious three-phase load imbalance and a low power factor. Compensation Results: Significant reduction in three-phase imbalance Power factor improved to meet utility requirements Stable operation of the furnace under optimized power conditions  Case 2: Wind Power Station Application in Yantai, Shandong Location: Yantai City, Shandong ProvinceCompensation Capacity: -10000kvar to +10000kvarSystem Voltage: 35kV Load Characteristics:Due to the intermittent nature of wind resources, the system suffered from frequent voltage fluctuations, with instantaneous power factor dropping as low as 0.81. Compensation Results: System voltage stabilized within 35.5–35.7kV Meets national standard GB/T 12325-2008 (Voltage Deviation Assessment) Real-time power factor raised to 0.96 Complies with GB/T 14549-1993 (Harmonics in Public Power Grid) Supports Low Voltage Ride-Through (LVRT) requirements Case 3: Induction Furnace Application in Xuzhou, Jiangsu Location: Xuzhou City, Jiangsu ProvinceCompensation Capacity: -4000kvar to +4000kvarSystem Voltage: 6kV Load Characteristics:The load exhibits a wide frequency spectrum with serious harmonic current distortion, especially at the 5th, 7th, 11th, and 13th orders. Compensation Results: Harmonic current compensation efficiency up to 70% below 19th order 5th, 7th, 11th, and 13th harmonic currents reduced to meet national standard Complies with GB/T 14549-1993 (Harmonics in Public Power Grid) ConclusionFGI SVG solutions demonstrate outstanding performance in tackling real-world grid challenges — from harmonic mitigation and power factor correction to voltage stabilization and LVRT compliance. Whether in renewable energy or heavy industry, FGI ensures that power systems remain efficient, reliable, and compliant. Production Base: Jincheng Road, Economic Development Zone, Wenshang County, Jining City, Shandong Province, China Email: overseas@fengguang.com

Introduction FGI’s Static Var Generator (SVG) technology plays a critical role in modern power systems by providing fast and dynamic reactive power compensation, enhancing voltage stability, and reducing harmonic distortions. This article presents three industrial application cases of FGI SVG solutions improving power factor correction, minimizing grid voltage fluctuations, and ensuring compliance with national electrical standards in China. Case 1: Dynamic Reactive Power Compensation for Rolling Mill Using FGI SVG Location: Heze City, Shandong ProvinceCompensation Capacity: -4000kvar to +4000kvarSystem Voltage: 10kV Load Characteristics:The rolling mill faces severe voltage fluctuations and large reactive power disturbances during steel rolling, with a low power factor of 0.35 and harmonic distortions exceeding limits at the 5th, 7th, 11th, and 13th orders. Compensation Results: Power factor improved to 0.98 through FGI SVG dynamic compensation Reactive power surges on the system side effectively eliminated Grid voltage fluctuations limited within 1.5% Harmonic voltages brought into compliance with regulatory requirements Case 2: FGI SVG Application in 30MW Photovoltaic Power Plant Location: Delingha City, Qinghai ProvinceCompensation Capacity: -8000kvar to +8000kvarSystem Voltage: 110kV Load Characteristics:The photovoltaic station experiences reactive power and voltage fluctuations due to varying solar irradiance levels. Compensation Results: Power factor maintained above 0.98 Voltage fluctuations significantly reduced using FGI SVG’s voltage stabilization capability Grid voltage at the measurement point meets national standards Improved Low Voltage Ride-Through (LVRT) capability of the PV plant Case 3: FGI SVG in Electric Arc Furnace Site Location: Changji City, Xinjiang ProvinceCompensation Capacity: -16000kvar to +16000kvarSystem Voltage: 35kV Load Characteristics:Electric arc furnace load varies violently, causing voltage flicker and generating multiple harmonics (2nd to 11th order, even and odd). Compensation Results: Effective improvement of grid voltage quality and flicker reduction Voltage fluctuations and flicker controlled to meet national standards Stable operation of other equipment ensured Case 4: FGI SVG Application in Urban Power Transmission and Distribution Location: Mianyang City, Sichuan ProvinceCompensation Capacity: -2000kvar to +2000kvarSystem Voltage: 10kV Load Characteristics:The supply line is relatively long, causing noticeable voltage fluctuations due to load variation and hydropower station output changes, with a low power factor. Compensation Results: Significant improvement in grid voltage stability Power factor raised to meet utility company requirements Enhanced supply reliability for urban customers ConclusionFGI’s Static Var Generator (SVG) technology is essential for dynamic reactive power compensation, voltage stabilization, and harmonic suppression in complex industrial power environments. These cases illustrate how FGI SVG enhances power quality, improves grid stability, and supports compliance with electrical regulations, making it a vital component in modern power systems. Production Base: Jincheng Road, Economic Development Zone, Wenshang County, Jining City, Shandong Province, China Email: overseas@fengguang.com

I. IntroductionA key state-owned coal enterprise in Northeast China, historically known for operating the first mechanized, electrified, and modernized large-scale open-pit coal mine in the country—and once the second largest in the world and the largest in Asia—has been a pioneer in China’s coal industry electrification. In recent years, this mining group has actively advanced its strategy for fully intelligent coal mining and accelerated the construction of a “Smart Mine.” FGI supported this initiative by supplying a fixed energy storage emergency power system for the group's materials company. The project features a 6kV 4MW/4MWh lithium iron phosphate (LFP) battery system, with an output voltage of 0.69kV. Through a 0.69kV/6kV isolation step-up transformer, the system is connected to the mine’s 6kV power grid. II. Operating Modes 1. Grid-connected Peak Shaving and Valley Filling Mode:Reduces load fluctuations on the grid. Charges during off-peak and mid-peak periods, discharges during peak and critical peak periods, lowering the enterprise's electricity costs. 2. Grid-connected Load Smoothing Mode:Gas generator sets are highly sensitive to load fluctuations. The energy storage system helps stabilize the load curve, enhancing power quality. 3. Off-grid Emergency Power Supply Mode:Operates independently from the grid to supply critical loads during power outages. 4. Off-grid Gas Power Station Support Mode:Supplements the limited capacity of gas generator sets, providing extended backup power during grid failures. III. Project HighlightsThis project features the following key advantages: Direct PCS off-grid parallel output ensures power supply for critical mining loads. Seamless startup and operation of major equipment such as main ventilation fans, hoists, and drainage pumps. Over 4 hours of stable joint operation with gas generator sets during emergency mode. IV. ConclusionFGI’s energy storage emergency power system has proven to be mature and internationally advanced. It ensures fast, stable, and continuous power for critical loads during grid outages in coal mines, significantly reducing safety risks and accident probability. The system greatly enhances emergency power supply and disaster resilience in mining areas, offering substantial economic and social value with broad potential for nationwide application. Production Base: Jincheng Road, Economic Development Zone, Wenshang County, Jining City, Shandong Province, China Email: overseas@fengguang.com

At a pivotal time for global energy transformation, FGI stands at the forefront of the energy revolution, leveraging its visionary strategy and exceptional technical prowess to drive industry development. 2024 was a year of significant achievements for FGI. Thanks to its deep expertise and continuous innovation in high-voltage cascade products, FGI was honored with the "Manufacturing Single Champion" title by the Ministry of Industry and Information Technology. This national recognition not only acknowledges FGI's past dedication to technological research and innovation but also solidifies its leading position in the industry, marking official recognition of its outstanding achievements in high-voltage cascade technology. In November 2024, FGI's first "100 MW Advanced Energy Storage System," developed on this platform, successfully rolled off the production line. This product features a PCS cascade design, boasting the largest single-unit capacity in China and significantly improving direct grid connection efficiency.   Strategic Partnership: FGI Powers 150MW/600MWh High-Voltage Cascade Energy Storage System In 2025, FGI entered a strategic partnership with a technology company to jointly develop a 150MW/600MWh high-voltage cascade energy storage system, marking a new chapter of collaboration. In this partnership, FGI is leveraging its leading advantages in high-voltage cascade PCS technology, providing 150MW PCS and 600MWh BMS for the energy storage system to ensure efficient and stable operation of energy conversion and control. The partner company, with its resources and technical strengths in batteries, is responsible for providing the batteries and system integration. This close collaboration exemplifies a win-win partnership in the energy storage sector, demonstrating effective resource allocation and complementary technical strengths.   FGI's Strategic Focus: Supplying PCS to Energy Storage System Integrators FGI's strategic focus on supplying Power Conversion Systems (PCS) exclusively to energy storage system integrators underscores its accurate judgment and deep understanding of the energy storage market's development trends. In the rapidly expanding energy storage market, specialized and refined industrial division of labor has become an inevitable direction. FGI specializes in the research and development and production of PCS. With a strong R&D team and advanced manufacturing processes, FGI provides integrators with technologically advanced, reliable, and energy-efficient PCS products, along with comprehensive, high-quality services. By working closely with integrators, FGI helps them effectively reduce production costs, significantly improve production efficiency, and enhance system performance, collectively advancing the energy storage industry toward a healthier and more sustainable future.   Successful Implementation and Future Outlook This collaboration is not only a successful application of FGI's high-voltage cascade PCS technology in a real project but also a vivid demonstration of its strategic layout. During the collaboration, FGI's advanced high-voltage cascade PCS technology was deeply integrated into the energy storage system, effectively improving the system's charging and discharging efficiency, stability, and reliability. Furthermore, both parties established efficient communication mechanisms and collaborative working models, including regular technical exchanges and project progress coordination, to ensure smooth project advancement. This strong cooperative model lays a solid foundation for future deeper collaborations in more areas and projects. Looking ahead, FGI will continue to uphold its innovation-driven development strategy, steadfastly increasing R&D investment in high-voltage cascade PCS technology, continuously optimizing product performance, enhancing product quality, and launching more innovative products to meet market demands. Concurrently, FGI will actively expand collaborations with more energy storage system integrators, embracing an open and inclusive cooperative attitude to share resources and achieve common development with partners. By integrating the advantageous resources of all parties, FGI will jointly explore new opportunities and challenges in the energy storage market, contributing more wisdom and strength to the vigorous development of the energy storage industry. Production Base: Jincheng Road, Economic Development Zone, Wenshang County, Jining City, Shandong Province, China Email: overseas@fengguang.com Website: www.fengguang.com

In today’s world, green, low-carbon, and intelligent development has become a global priority. As countries navigate diverse development stages and resource conditions, balancing energy security with sustainable transition remains a critical challenge. For major energy consumers and the global energy market alike, overcoming the “energy trilemma” — affordability, sustainability, and reliability — is key. FGI (Shandong-based state-owned enterprise) continues to lead by innovation. Leveraging its technical strengths, FGI has successfully applied high-voltage cascade technology in the field of electrochemical energy storage, setting a new benchmark for the industry. Project Overview Located in Lingtai County, Gansu Province, this project supports a 100MW agro-photovoltaic hybrid power station with an advanced energy storage system. The PV plant includes a new 110kV booster station, equipped with two 105MVA main transformers, connected to a 330kV substation via a 110kV overhead line. The supporting energy storage system has a rated capacity of 5MW/10MWh. Energy from the battery system is converted through PCS and stepped up from 10kV to 35kV, then integrated into the 110kV substation via a 35kV collection line. The solution adopts a 10kV high-voltage cascade system combined with a 35kV/10kV booster transformer. The storage system includes battery clusters, PCS units, EMS, and fully equipped containers (with HVAC, ventilation, distribution, fire protection, security, lighting, and fire-retardant materials), as well as internal cabling and communication lines. Key Features 35kV step-down design: Voltage is stepped down to 10kV before connecting to the high-voltage cascade energy storage system. Balance of safety and cost: Optimized configuration ensures system safety and cost-effectiveness. Modular single-phase design: Enhances safety spacing and capacity allocation. Large capacity per unit: Simplifies grid dispatch and enables fast response. No circulating current: Battery clusters operate in series with efficient energy flow. Social & Environmental Benefits The 5MW/10MWh energy storage system enhances the stability of PV output, enabling large-scale renewable integration. It actively supports grid regulation by storing energy during the day and discharging at night, easing nighttime power supply pressure. By participating in the electricity market, the storage system also improves the economic returns of the PV station. Over its 25-year operation period, the project is expected to generate 186 million kWh annually, reduce CO₂ emissions by approximately 170,000 tons, and save 57,000 tons of standard coal each year — contributing significantly to regional environmental improvement while delivering economic value. Production Base: Jincheng Road, Economic Development Zone, Wenshang County, Jining City, Shandong Province, China Email: overseas@fengguang.com Website: www.fengguang.com

Coal is China's main energy source, dominating primary energy production and consumption. It has consistently made up over 50% of China's primary energy use, providing stable energy for economic growth. With abundant coal resources, a healthy coal mining industry is vital for national energy security, reducing reliance on external sources and mitigating market risks. Coal mining is complex, with various electrical equipment. Their operation often leads to power quality issues like voltage fluctuations, harmonics, and low power factor. These problems can disrupt equipment, shorten lifespan, increase losses, and incur penalties. FGI's Solution FGI offers a specialized power quality solution for the coal mining industry, tailored to their power consumption and load characteristics. By installing dynamic reactive power compensation devices in coal mine substations, the solution stabilizes voltage, mitigates harmonics, and improves power factor. These devices can also connect to a user's monitoring system for remote operation, reducing maintenance costs. 【A coal mine in Xinjiang: 10kV, 6M, Indoor Air-Cooled SVG】 【A coal mine in Gansu: 10kV, 15M, Indoor Water-Cooled SVG】 【A coal mine in Ordos: 10kV, 6M, Outdoor Water-Cooled SVG】 Advantages of FGI's Solution Rapid Response: Reactive power response time is under 5ms, ensuring precise and fast compensation, superior to traditional devices. Harmonic Mitigation: Features multi-harmonic detection. Actively generates inverse harmonic currents to control and mitigate harmonics at the site's output. Diverse Models for Layout Needs: Through continuous upgrades, FGI's products offer a wide range of cooling methods: forced air, air-conditioned internal circulation, air-water, forced water, and water-water cooling. Supports various indoor and outdoor installation styles, reaching industry-leading standards. At FGI, we're not just about technology; we're about a sustainable future for everyone. Our advanced SVG products, born from years of dedicated research, are making a real difference globally. From powering wind farms to optimizing industrial operations, our solutions are helping industries worldwide operate more efficiently and sustainably. We're proud to contribute to the global effort for a greener planet, one innovative step at a time. Production Base: Jincheng Road, Economic Development Zone, Wenshang County, Jining City, Shandong Province, China Email: overseas@fengguang.com Website: www.fengguang.com

I. Background The Kubuqi Desert, China's seventh-largest, has been a major focus for ecological management. Desertification threatens its ecosystem and nearby economies. However, this barren area is rich in solar energy. Photovoltaic (PV) desert control projects effectively use this resource to improve the environment. These projects build large PV power stations in the desert using advanced technology. The solar panels generate clean electricity for surrounding areas, and also stabilize sand and prevent wind erosion. This project showcases an innovative, multi-faceted approach to desert control, leveraging solar technology to generate power, revitalize land, and boost rural economies. Pioneering Technology: This is China's first large-scale PV desert control project to extensively use flexible support materials in a desert environment. Enhanced Power Generation: It utilizes bifacial solar modules for double-sided power generation, boosting electricity output by 5-10%. Multi-dimensional Ecological Planting: High-quality forage grass and medicinal herbs are cultivated beneath the solar panels. Innovative "Livestock-Forage Coupling": A unique desert control technique is employed between the panels, starting with raising chickens, then sheep. Soil Improvement and Sustainability: Livestock manure is returned to the fields, aiding desert control and soil improvement. "PV+" Benefits: The project delivers multiple advantages, including power generation above the panels, planting below, breeding between, desert control and soil improvement, and rural revitalization.   II. FGI's Solution Currently, several power stations within the Kubuqi PV desert control project are already connected to the grid. FGI provided 8 high-power Static Var Generator (SVG) devices, contributing to the smooth grid connection of the photovoltaic power generation project. Based on different on-site requirements, both indoor and outdoor models were configured for users. Each device is connected to the on-site integrated automation system, enabling remote monitoring and real-time upload of operational data, which facilitates convenient operation and maintenance.   【Sanxia Mengneng Kubuqi Project, Mengken PV Power Station】       【Sanxia Mengneng Kubuqi Pilot PV-Storage Power Station】     III. Advantages of the Solution FGI actively responds to policy and industry demands, and considering equipment operational performance, has iterated on its dynamic reactive power compensation devices multiple times, resulting in the following advantages: Excellent High and Low Voltage Ride-Through Capability Indicators like the range and duration for high and low voltage ride-through exceed national standards. This ensures the equipment stays online during sudden drops or surges in grid voltage, preventing accidents from escalating. Time-Based Automatic Control Switching The system can set different operating modes based on specific times, automatically switching to better adapt to various on-site requirements. Rich Variety of Models FGI offers a wide range of models, including indoor, outdoor, air-cooled, and water-cooled units. Voltage levels cover 6kV, 10kV, 20kV, and 35kV, meeting diverse project demands. Multi-Unit Coordinated Control Mode This enables unified and coordinated control when multiple devices operate on a shared busbar. FGI specializes in the research, development, and manufacturing of power electronic products. We offer five main product categories: "electricity conservation, power quality, explosion-proof power, renewable power, and energy storage." FGI is committed to contributing its strength to the construction of a new power system.                                     Production Base: Jincheng Road, Economic Development Zone, Wenshang County, Jining City, Shandong Province, China Email: overseas@fengguang.com   Website: www.fengguang.com                                          

FGI has successfully addressed the difficult startup issue for flow battery energy storage systems. They did this by providing a customized 100kW DC/DC converter and a 630kW bidirectional inverter that work together for a client in Singapore. As a "technological pioneer" in core equipment for flow batteries, FGI's DC/DC module ensures the smooth implementation and operation of the client's flow battery project thanks to its 0V disturbance-free startup technology.       Key Technical Features of FGI's 100kW DC/DC Module   Addressing industry pain points, FGI independently developed its 100kW DC/DC module specifically for flow batteries. Its core competitive advantages lie in high precision, high reliability, and intelligence, providing a comprehensive solution for the Singapore project.     1. Wide Voltage Dynamic Matching Technology Broad Coverage: The low voltage side spans 0-850V (0-±275A), and the high voltage side covers 50-900V. This perfectly adapts to the wide voltage fluctuation characteristics of various flow battery types, including all-vanadium and iron-chromium batteries. Leading Efficiency: Utilizing Silicon Carbide (SiC) devices and a 6-phase interleaved parallel technology, it achieves a full-load efficiency of 99.5%, which is leading in the industry.     2. Intelligent 0V Impact-Free Activation Optimized Charging Logic: Through pre-charge detection and a stepped boost algorithm, it enables smooth startup of flow batteries from a 0V state. This prevents electrolyte backflow and electrode damage, extending battery life by over 20%. Cost Optimization: It eliminates the need for additional pre-charge circuit designs, saving approximately 15% in hardware costs per module.     3. Modular Redundant Design Flexible Expansion: Supports multi-module parallel operation, with single-unit power covering 50-100kW, and the system can be expanded to the megawatt (MW) level. N+1 Redundancy: In case any module fails, the system automatically switches to a backup unit, ensuring continuous operation.         DC/DC Technology Driving Flow Battery Industry Development   As flow battery costs continue to decline (expected to drop below 1.5 CNY/Wh by 2025), the efficiency and intelligence of DC/DC modules will become a key focus for industry competition. Solar-Storage-Direct-Flexible Applications: Through deep coupling of DC/DC and PCS (Power Conversion System), it can directly drive DC loads, reducing conversion losses in supporting power supplies like photovoltaic systems. AI Empowerment: AI power prediction algorithms enable self-optimization of the DC/DC module's charge and discharge strategies.     FGI's 100kW DC/DC Module Technology   FGI has specialized in power electronics for over 30 years, covering applications such as flow batteries, hydrogen energy, and rail transit.   Core Advantages: Full-Stack Independent Research & Development: Mastering key technologies including topology design, thermal simulation, and intelligent control. Rigorous Verification: Passed 67 reliability tests, including salt spray, vibration, and high/low-temperature cycling. Rapid Response: Supports fast customized design and development, and provides lifetime operation and maintenance services.     100kW Bidirectional DC Converter Technical Parameters   Time Category 100kW Bidirectional DC Converter Electrical Parameters Low Voltage Side / V 0~850V (Current range 0A~±275A) High Voltage Side / V 50V~900V (Rated voltage 700V, Rated current 143A) Rated Power / kW 100 Overload Capability 110% of rated current, long-term Low Voltage Rated Current / A 200 (max@275A) High Voltage Rated Current / A 143 Voltage Control Accuracy 1% Current Control Accuracy 1% Maximum Efficiency 99.5% Current Ripple RMS ≤2% MPPT Function Yes Other Parameters Dimensions / mm (WDH) 560*570*185mm Weight / kg

I Project Overview Hamza Sugar Mills Limited of Pakistan, formerly known as Hi-sons Sugar Mills established in 1969, was renamed to its current name in 1970. The company currently has a production scale of 38,000 tons of crushing capacity per day, making it the largest sugar mill in Asia. Its main products are sugar and raw materials for alcohol.   【Exterior View of Hamza Sugar Mill】       II Brief Introduction to Sugarcane Sugar Production Process Sugarcane sugar production mainly includes four steps: pretreatment, pressing, clarification and evaporation, and sugar boiling. After pretreatment, the sugarcane enters the press through a conveying system, where it undergoes multiple squeezings to extract the juice. The juice then enters the clarification, evaporation, and sugar boiling processes to produce white sugar, while the pressed residue is processed separately. The press is a crucial piece of equipment for extracting sugarcane juice using mechanical pressure. It mainly consists of a shredder and a main body containing three rollers, which are driven by a power device. The principle of juice extraction by pressing is to break the sugarcane cells and release the juice through squeezing. To improve extraction efficiency, the pressing process often uses multiple stages and may incorporate an imbibition process, which involves soaking the pressed bagasse in hot water or dilute juice to further extract residual sugar. 【Pressing Production Process Flow Chart】       III Reasons for Equipment Modification The extraction rate of the press is a crucial factor affecting sugar absorption; for every 1% increase in the extraction rate, the total recovery rate can be improved by 0.88% to 0.92%. The main factors affecting the extraction rate include: Reabsorption during fiber expansion: After pressing, the sugarcane fibers expand upon leaving the press, absorbing some of the extracted juice and causing sugar loss. Degree of crushing and morphology of cane material: ​ A good degree of crushing is a prerequisite for efficient pressing, promoting juice extraction and seepage. Moisture content of bagasse: Lowering the moisture content of bagasse ensures a higher extraction rate. Uniformity of cane layer thickness: Uneven cane layer thickness can lead to incomplete pressing or high bagasse moisture content, affecting the extraction rate. Wear of press rolls: Wear of the press rolls in the later stages of the crushing season increases the gap between them, reducing the extraction rate.   【Original Steam Turbine Operation Scene】     The original press, driven by an inefficient and polluting back-pressure steam turbine (without a condenser, leading to high exhaust temperatures), also lacked adjustable speed. This resulted in suboptimal cane layer thickness about 10% of the time, lowering the average extraction rate below 95.4%, causing sugar loss and reduced output. Consequently, the user sought a modification for press speed regulation to improve extraction (theoretically by >0.2%) and save energy by reducing speed during insufficient cane layer thickness.       IV Modification Plan According to on-site requirements, the modification plan adopts a high-voltage inverter + motor to replace the original steam turbine-driven press. The high-voltage inverter, as the motor's starting device, offers the following main advantages: Smooth start, protecting the motor and power grid: Reduces the impact of direct starting on the power grid, avoids motor winding overheating and insulation aging caused by instantaneous high starting current, and extends motor lifespan. Simple operation and easy maintenance. Convenient speed regulation to meet press process requirements. ​ IV.I On-site Equipment Conditions Each production line is equipped with 5 presses. The first press uses a one-to-one high-voltage inverter driving a high-voltage motor. This motor is a variable frequency three-phase asynchronous motor manufactured by Shanxi Electric Machinery Manufacturing. The first press has a heavier load, so its motor and inverter have higher power, while the remaining presses have lighter loads and correspondingly smaller equipment power.   Table 1 Basic parameters of the first press High-voltage variable-frequency three-phase asynchronous motor parameters Model Y3RKK6301-4 Power 2000kW Power factor 0.88 Rated voltage 11000V Rated speed 1490r/min Work system S1 Rated current 133.6 A Protection level IP55 Insulation class F Rated frequency 50/60Hz Connection method Y Cooling method IC 666 Manufacturer Shanxi Motor Manufacturing Co., LTD Basic parameters of high voltage frequency converter Model JD-BP38-2400FBIM Rated voltage 11000V Rated current 172.8 A Rated frequency 50/60Hz Rated power 2400     Table 2: Basic Parameters of the second to the fifth presses High-voltage variable-frequency three-phase asynchronous motor parameters Model YSPKK5603-4 Power 1250kW Power factor 0.914 Rated voltage 11000V Rated speed 1500r/min Work system S1 Rated current 93.8 A Protection level IP55 Insulation class F Rated frequency 50/60Hz Connection method Y Cooling method IC 666 Manufacturer Shanxi Motor Manufacturing Co., LTD Basic parameters of high voltage frequency converter Model JD-BP38-1400FBIM Rated voltage 11000V Rated current 101A Rated frequency 50/60Hz Rated power 2400   The main advantages of using a variable frequency motor include: High balance quality and high-speed capability: Vibration level R, high machining accuracy of mechanical parts, equipped with special high-precision bearings. Efficient and reliable cooling system: ​Uses imported axial flow fans for forced ventilation and heat dissipation, ensuring effective cooling of the motor at various speeds for long-term stable operation. Wider speed regulation range and higher design quality: ​Special magnetic field design suppresses high-order harmonic magnetic fields, meeting wide-frequency, energy-saving, and low-noise requirements, with wide-range constant torque and power speed regulation characteristics, stable speed regulation, and no torque pulsation.     IV.II On-site Modification of Main Circuit   【Simplified Diagram of Pressing Process】     According to on-site needs, each production line is equipped with 5 sets of presses. The variable frequency drive system for each press includes the following main components: Bypass cabinet: Serves as a standby power frequency starting device. Transformer cabinet. Power unit cabinet. Control cabinet: The panel is equipped with local/remote switching buttons, emergency stop buttons, and power frequency/variable frequency operation indicator lights. This modification adopts the JD-BP38 series high-voltage inverter manufactured by FGI Electronic Technology Co., Ltd. The operating frequency of the variable frequency speed regulation system is set via a remote operation console, making it convenient for personnel in the electrical control room to monitor the system status and adjust the speed of the press according to production needs, thereby improving production efficiency. 【Main Circuit Diagram of On-site Modification】     The main circuit is equipped with knife switches K1, K2, and K3. During variable frequency operation, K1 and K2 are closed, and K3 is open; during power frequency operation, K1 and K2 are open, and K3 is closed. These three knife switches have strict mechanical and electrical interlock relationships to prevent simultaneous connection of power frequency and variable frequency power supplies, ensuring safe system operation.     IV.III Control System 【Control System Diagram】     For export requirements, the FGI inverter adopts an all-English design, including the interface and parameter settings, making it easy for users to understand. Its control system mainly consists of the following parts: Controller: The core control unit, including: Optical fiber board: Transmits data signals bidirectionally between the optical fiber and the power unit. Each board controls the units of one phase, sending PWM signals and operating modes, and receiving fault codes. Main control board: Adopts a high-speed DSP single-chip microcomputer to complete motor control, generate PWM three-phase voltage commands, and exchange status parameters and setting parameters with the human-machine interface via the RS232 interface. Signal board. Power board. Human-Machine Interface (HMI): Provides a user-friendly all-English operating interface, responsible for information processing and external communication, and can implement networked control with optional upper monitoring. It collects data through the main control board and PLC board, calculates and displays operating parameters such as current, voltage, power, and frequency, and has recording, overload, and overcurrent alarm protection functions. It is connected to the main control board via RS232 and to the PLC board via RS485 for real-time monitoring of the system status. ​ 【FGI Variable Frequency Control System Main Interface】     【Parameter Setting Interface】   PLC board: Processes the internal switching signals of the inverter and on-site operation signals and status signals, enhancing application flexibility. It has the capacity for 4 analog inputs (processing analog signals such as flow and pressure from the field or setting signals) and 2 analog outputs (outputting frequency setting signals). Host computer: Communicates with the PLC board via the RS485 interface, facilitating user operation of the inverter and real-time monitoring of its operating parameters. It can be connected to a printer to record data. Operators can perform various operations in the monitoring room without needing to enter the high-voltage electrical control room, improving convenience and safety, reducing labor intensity, and enhancing work efficiency.   IV.IV Control Modes The FGI inverter supports three control modes: Local Control: Operation of motor start/stop and all functions via the inverter's interface. Remote Control: Reception of on-site switch control signals through the built-in PLC board. Upper Control: Reception of control signals from the upper system via the RS485 interface and Modbus communication protocol. This modification utilizes upper control, with operators adjusting frequency and monitoring running parameters on the host computer.   【On-site Control Box】     IV.V On-site Variable Frequency Modification of Press This system comprises a high-voltage switchgear and a high-voltage inverter, with each line equipped with 5 sets of high-voltage inverters and high-voltage switchgears.       【Operation Screen Diagram】       IV.VI Technical Features of FGI JD-BP38 Series High Voltage Inverter The FGI JD-BP38 series high-voltage inverter is a high-performance, high-high voltage source inverter featuring high-speed DSP control, speed sensorless vector control, and power unit series multi-level technology. It offers excellent power quality and motor protection and has been recognized as a China Famous Brand product. Its specific features include: High-speed DSP control: Faster calculation speed and more precise control. Flying start: Ability to recognize motor speed and start directly. Restart in rotation: Automatic operation after rapid recovery from power failure. Line voltage automatic equalization: Ensures balanced line voltage output during unit faults. Unit DC voltage detection: Optimizes voltage control, reduces harmonics, and improves accuracy. Long-life electrolytic capacitors: Utilizing patented technology, lifespan is increased by 1 time. High-reliability cooling structure: Low IGBT voltage stress and wide overvoltage range. Sudden phase-to-phase short circuit protection: Immediate equipment protection during short circuits. Current limiting function: Prevents overcurrent protection and reduces downtime. Fault auto-reset: Automatic recovery after overcurrent due to sudden load changes.     V Effects After Modification The press modification has been well-received by users due to simplified operation and maintenance, and an improved working environment with reduced labor and steam emissions. After modification and commissioning, the system offers the following advantages: Soft start: Adjustable start time and mode based on on-site conditions. High power factor: Achieves 0.95 or higher, eliminating the need for additional compensation. No harmonic pollution: Effectively reduces motor heating. Low torque pulsation: Minimizes mechanical resonance and wear on transmission mechanisms. Perfect output waveform: Distortion rate less than 4%. Reduced jamming and downtime: Lowers stoppages caused by excessive cane layer thickness. Improved extraction rate: Expected increase of over 0.2%, conservatively estimated at 0.1%, potentially increasing annual revenue by 119,000 yuan. Significant energy saving: Reduced power consumption per ton of cane from 33.02 kWh to 31.22 kWh, resulting in annual savings of 342,000 yuan. Reduced maintenance costs: Decreased downtime and maintenance expenses.     VI Conclusion This variable frequency drive modification has not only saved energy but also enhanced system automation, reduced equipment wear, enabled demand-based speed control, lessened the labor intensity for workers, and significantly improved overall system efficiency. FGI will continue to pursue growth and innovation in the variable frequency drive industry, proactively consider user needs, and contribute to the upgrading and transformation of industrial electrical equipment in Pakistan.                                 Production Base: North of the middle section of Jincheng Road, Economic Development Zone, Wenshang County R&D Center: No. 21, Gongye North Road, Baoshan Sub-district, Licheng District, Jinan City Email: overseas@fengguang.com Website: www.fengguang.com.                                  

Introduction With the continuous maturation of high-voltage variable frequency drive (VFD) technology, four-quadrant drives are extensively utilized in the mining sector. For electric drive systems, the configuration of Permanent Magnet Motors (PMMs) coupled with variable frequency speed control has become predominant. The application of high-capacity VFDs to drive mine hoisting systems is especially significant in the context of intelligent mines.     Project Overview In a newly established mine project in Ordos, the client, following comprehensive multi-party evaluation, selected FGI four-quadrant drives, which command a significant market share in this industry. The configuration involves two Model JD-BP37-1400T (1400kW/6kV) high-voltage four-quadrant drives operating in a dual-drive parallel arrangement to power a 6kV/2500kW Permanent Magnet Synchronous Motor (PMSM) for the hoist system.   Field Equipment Diagram   System Scheme The system utilizes two high-voltage four-quadrant drives to operate a single motor, employing a master-slave control architecture for data signal linkage. The data definitions for master-slave control signal transmission are specified as follows.   Send Receive Communication Content 1#A-T 2#A-R Unit #1 sends to Unit #2: output voltage, frequency, and start/stop status. 1#B-T 2#B-R Unit #1 sends to Unit #2: voltage, current, and status signals. 2#A-T 1#A-R Unit #2 sends to Unit #1: output voltage, frequency, and start/stop status. 2#B-T 1#B-R Unit #2 sends to Unit #1: voltage, current, and status signals.   Master-Slave Control Data Transmission Definition   The master-slave control signal connection topology is depicted in the figure below. Data communication is realized through fiber optic links, which substantially improves the noise immunity of signal transmission.   Master-Slave Control Signal Connection   This configuration allows either Drive #1 or Drive #2 to be designated as the master unit, thereby providing enhanced operational flexibility and convenience at the application site.   Operational Advantages Beyond the capabilities of standard high-voltage VFDs, Sunlight's high-voltage hoist drives incorporate the following distinctive features optimized for hoist control applications: Input Inrush Current Limiting Technology for Power-Up: This technology minimizes the current surge during each high-voltage power-up sequence, thereby reducing the impact on the power grid. Low No-Load Loss Control Technology: In standby mode, the drive system exhibits minimal no-load losses, which have been empirically verified to be 2-3 times lower than those of products based on conventional technologies. Vector Control Technology: Facilitates four-quadrant motor operation, incorporating capabilities such as zero-speed holding without mechanical brake engagement and torque preset functionality. Hoist Drive Specific Functions: Integrates multiple braking modes, including regenerative braking, DC injection braking, and safety braking, to ensure dependable hoist operation. Dedicated Hoist Interfaces: Offers a comprehensive suite of interfaces for seamless integration with the hoist electrical control system.   Conclusion The rapid advancements in industrial automation and green energy-saving technologies underscore the significant advantages offered by the synergy between four-quadrant drives and Permanent Magnet Synchronous Motors (PMSMs) in enhancing the performance of hoisting systems. This combination provides a robust technological foundation for the intelligent and high-efficiency operation of permanent magnet hoists. The profound integration of Sunlight's four-quadrant drives with permanent magnet hoists represents not merely an inevitable trajectory for the upgrade of traditional industrial equipment, but also a critical technological pathway towards realizing intelligent manufacturing and sustainable development. Prospectively, under the dual impetus of policy support and market demand, Sunlight is committed to achieving continuous breakthroughs in areas of high efficiency and energy conservation, intelligent control, and application scenario adaptability, thereby injecting new dynamism into the transformation and upgrading of China's intelligent mining sector.                                 Production Base: North of the middle section of Jincheng Road, Economic Development Zone, Wenshang County R&D Center: No. 21, Gongye North Road, Baoshan Sub-district, Licheng District, Jinan City Email: overseas@fengguang.com   Website: www.fengguang.com.                                  

The Evolving Energy Landscape Commercial & Industrial (C&I) Energy Storage Systems (ESS) are pivotal for integrating clean energy, reducing transmission losses, and accelerating the transition towards dual-carbon goals. Favorable electricity pricing policies, widespread demand response programs, and falling lithium battery costs are increasingly validating C&I ESS applications, establishing them as key market players.   Limitations of Traditional C&I ESS Approaches Traditional time-based strategies for charging and discharging C&I ESS were adequate for simple, stable industrial park loads. However, modern parks feature dynamic elements like solar PV, distributed wind power, EV charging, and adjustable loads. These complexities, coupled with the need for greater economic efficiency (e.g., managing demand charges), mean simple timed strategies are no longer sufficient.   FGI’ s Advanced C&I Energy Storage Solution Industrial parks typically have high power consumption and prolonged peak loads. Integrating renewables necessitates robust energy storage for supply-demand balancing. Our "Industrial Park + ESS" model enables the storage of surplus renewable energy (e.g., from solar PV) for use during peak hours. This stabilizes the park's power supply, alleviates grid pressure, provides backup power, and allows for significant cost savings through peak-valley arbitrage, especially given the common industrial tariff structures.   Application Showcase: Optimizing a Manufacturing Facility Client Profile: An auto parts manufacturer in Wenzhou, Zhejiang, with existing 2MW solar PV, 80kW EV charging stations, and flexible production lines, leading to increasingly unpredictable and uncontrollable electrical loads. Our Solution: Following a detailed site analysis, we implemented a dynamic, real-time load tracking solution using six 100kW/215kWh C&I ESS units integrated into their low-voltage distribution system. ​ Mechanism & Benefits: The ESS acts as an energy reservoir, intelligently coordinating with the client’s solar PV, EV chargers, flexible production lines, and general operational loads. Through high-speed data integration and real-time analytics, the system dynamically adjusts ESS charge/discharge states and power. This progressively optimizes the client's energy economics, significantly reducing electricity costs and enhancing overall profitability.   Key Features & Benefits of Our Solution Dynamic Load Optimization & Cost Savings: Intelligent algorithms continuously optimize "buy low, sell high" strategies by tracking load changes in real-time. Significantly reduces electricity costs through peak shaving and optimized demand charge management. Achieves a true "on-demand, source-follows-load" capability, adapting instantly to changing needs. Enhanced Flexibility & System Integration: Facilitates flexible integration and adjustment of renewable energy sources (solar, wind) based on production demands. Breaks down operational silos by seamlessly connecting ESS with PV systems, EV chargers, and various production loads through advanced information networking. Proactive Strategy & Expanded Value: Transforms ESS from a passive peak-shaving tool into an active system that constantly seeks and implements optimal energy strategies. Provides a versatile solution that accommodates both existing and evolving load profiles in industrial parks.                                 Production Base: North of the middle section of Jincheng Road, Economic Development Zone, Wenshang County R&D Center: No. 21, Gongye North Road, Baoshan Sub-district, Licheng District, Jinan City Email: overseas@fengguang.com   Website: www.fengguang.com.