Cases

Understanding Harmonics: A Rising Concern in Power Systems As modern power systems evolve with rapid advancements in power electronics, one issue has become increasingly critical yet often overlooked: harmonics. The integration of high-power semiconductor devices such as thyristors, MOSFETs, and IGBTs has led to a significant rise in non-linear loads across power grids. These loads distort the sinusoidal nature of current and voltage waveforms, resulting in harmonics — a major power quality challenge that can no longer be ignored. In earlier systems dominated by linear loads, power quality was largely the responsibility of the utility. However, as today's energy users adopt more diverse and sophisticated equipment, power quality indicators such as harmonics, voltage flicker, and imbalance are now heavily influenced by the user side. A clear understanding of harmonics is essential for anyone involved in system design, operation, or troubleshooting. 1. What Are Harmonics? According to China's national standard GB/T 24337 (Power Quality - Interharmonics in Public Power Grids), harmonics are defined as the components of an electrical signal whose frequencies are integer multiples of the system's fundamental frequency. In China, the standard grid frequency is 50Hz. Harmonics at 100Hz, 150Hz, 200Hz, etc., are thus referred to as the 2nd, 3rd, 4th harmonics, and so on. Harmonics can be classified in two major ways: By sequence: Positive sequence, negative sequence, and zero sequence. By frequency multiple: Odd-order harmonics (3rd, 5th, 7th, etc.) Even-order harmonics (2nd, 4th, 6th, etc.) Odd harmonics are more commonly encountered in practice and can be monitored via system back-end data or waveform analysis tools. 2. What Causes Harmonics? Harmonics typically originate when sinusoidal voltages are applied to non-linear loads. Common sources include: Power electronic equipment: Variable frequency drives (VFDs), rectifiers, and inverters, which generate dominant 3rd, 5th, 7th and higher-order harmonics. Industrial machinery: Arc furnaces, fluorescent lighting, and induction heaters. These devices disrupt the linear relationship between voltage and current, causing waveform distortion and the injection of harmonic currents into the system. Over time, this can lead to overheating, insulation failure, equipment malfunction, false tripping, and even widespread system instability. In recent years, the growth of renewable energy systems (e.g., PV and wind) has introduced more inverters and converters into the grid, increasing the harmonic footprint and placing higher demands on modern power system control.   3. How to Mitigate Harmonics: A Multi-Pronged Strategy Effective harmonic mitigation requires a combination of proactive design, strategic equipment selection, and corrective technologies. Key approaches include: (1) Source-side control: The most cost-effective and thorough method. By optimizing load design and selecting low-harmonic devices, the generation of harmonics can be minimized at the source. (2) Equipment protection: For sensitive devices, apply isolation or electromagnetic interference (EMI) mitigation strategies to reduce the impact of harmonics. (3) Filtering solutions: Passive filters: Cost-effective and suitable for filtering specific fixed-frequency harmonics. Active filters: More versatile and effective in dynamic environments but come at a higher cost. Note: Filter deployment must be carefully evaluated to avoid potential resonance with the grid. Conclusion Harmonic distortion is an increasingly urgent issue in modern power systems. As energy infrastructures grow more complex, identifying, analyzing, and mitigating harmonics must become a standard practice for engineers and energy professionals. With the right knowledge and tools, power quality can be safeguarded, ensuring both reliability and efficiency in the next generation of electrical networks. 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.

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

Introduction Intelligent coal mine construction demands advanced drive and control technologies for high-voltage, high-power underground equipment such as main belt conveyors, shearers, fans, and pumps. Among these, the main underground belt conveyor plays a critical role in coal transportation. It operates with heavy loads, large capacity, and continuous duty cycles. Traditional hydraulic couplers, though offering limited speed regulation, suffer from high slip losses, low efficiency, heavy dependence on oil quality, and high maintenance requirements. High voltage explosion-proof VFDs (variable frequency drives) provide a superior solution. With wide speed range, precise control, fast response, and soft start capabilities, they are now essential for coal mine conveyor drive systems. Replacing hydraulic couplers with FGI explosion-proof VFDs enables adjustable speed, high starting torque at low current, balanced load distribution, and robust protection functions—meeting the demands of modern intelligent coal mine solutions. Case Study: Yingpanhhao Coal Mine Application System Overview Yingpanhhao Coal Mine in Ordos, Inner Mongolia, has a production capacity of 12 million tons per year. Its north wing main belt conveyor system uses an FGI high voltage explosion-proof VFD (Model BPBJV2-1250/10) with the following specifications: Input/Output Voltage: 10kV Rated Power: 1250kW Topology: Cascaded structure with 8 power cells per phase The conveyor drive system integrates permanent magnet direct-drive synchronous motors (Model TBVF-900YC, 10kV, 900kW, 60 rpm). The configuration includes 4 motors at the head and 2 at the tail, managed through a master-slave control architecture with optical fiber communication. This ensures precise coordination, reliable operation, and long-distance driving capacity of up to 5,000 meters.         System Structure & Control The system is powered through a phase-shifting transformer, providing three key functions: Step-down to 690V for isolated power supply to power cells. Phase-shifting for multi-pulse rectification, reducing harmonic distortion. Isolated supply for cascaded cell operation. The cascaded power cell design, combined with carrier phase-shifting technology, produces an almost sinusoidal output without the need for filters. This minimizes harmonic interference on both motors and grid, earning FGI the recognition as a “harmonic-free drive system”. Master-slave fiber optic communication ensures reliable high-speed data transfer, while vector control with speed droop algorithms dynamically balances motor loads. This addresses the common issue of load imbalance in multi-motor conveyor systems.           Key Application Benefits Soft Start Capability Provides up to 2.2× rated torque at low frequency with adjustable acceleration (1–3600s), meeting heavy-load soft start requirements. Precise Power Balancing Achieves torque balance across head and tail drives, with motor imbalance rate below 2%, even over 5 km cable length. Online Switching & Redundancy Operates in “5 running + 1 standby” mode. If one VFD fails, the standby unit activates immediately, ensuring continuous conveyor operation. Automatic Speed Adjustment With coal flow sensors, belt speed adapts to load conditions: “faster with more coal, slower with less.” Transport efficiency is significantly improved. Energy Saving & Reduced Wear Permanent magnet direct-drive motors eliminate gear reducers, increasing efficiency and reducing mechanical wear. Soft start lowers system impact, while variable speed reduces high-speed operation time. This leads to: Reduced maintenance costs Extended equipment lifespan Lower energy consumption Advantages of FGI Explosion-Proof VFD Solutions Compact Footprint & Easy Maintenance Integrated transformer + VFD design saves space and reduces cabling. Modular design simplifies on-site maintenance. ​ Multiple Reliability Safeguards Built-in redundancy with automatic power cell bypass ensures uninterrupted production.   Adaptive Load Balancing Self-adjusting load sharing supports up to 10 coordinated VFDs. Smart Mine Communication Interfaces Supports fiber, Ethernet, and wireless access. Enables remote monitoring, fault diagnosis, and predictive maintenance via PC or mobile app. Conclusion The mining industry is rapidly shifting toward large-scale intelligent coal mine operations. The Guidelines for Intelligent Coal Mine Construction highlight the urgent need for high voltage explosion-proof VFDs to power conveyors, shearers, and other critical systems. The successful deployment of FGI’s harmonic-free explosion-proof VFD at Yingpanhhao Mine demonstrates breakthrough performance: Input THD < 3% Output Voltage Harmonics < 2% +15% Drive Efficiency Improvement +20% Overall System Energy Efficiency 18–25% Energy Savings 500+ tons CO₂ reduction per unit annually By enabling long-distance power transmission, precise load balancing, and smart diagnostics, FGI solutions support the coal industry’s dual-carbon goals while driving operational safety and efficiency. Call to Action Discover how FGI high voltage explosion-proof VFD solutions can enhance your coal mine conveyor systems with energy-saving drive technology, soft start functions, and intelligent automation.

Project Overview Recently, FGI successfully delivered a 5MW/20MWh aqueous organic flow battery energy storage system, equipped with a 5MW boost-integrated unit, achieving one-time grid connection in Ordos, Inner Mongolia. The project has obtained the official approval from the Inner Mongolia Power Dispatch and Control Company for completing the trial run of an independent new-type energy storage system. It has not only been successfully connected to the Inner Mongolia spot electricity market, but has also officially entered the commercial operation stage, marking a significant milestone in the practical deployment of this energy storage project.     This project integrates a 195MW lithium iron phosphate (LFP) battery system with a 5MW aqueous organic flow battery system, forming an independent grid-side energy storage system with a total capacity of 200MW/800MWh. Notably, this is the world’s first MW-level application of an aqueous organic flow battery, a breakthrough with milestone significance for the global energy storage industry.       System Solution Highlights The 5MW boost-integrated unit adopts a modular design, consisting of two 2.5MW units operating in coordination to deliver stable and efficient power output. To ensure the reliable startup of the aqueous organic flow battery, each 2.5MW unit is equipped with a dedicated 100kW DC/DC converter, designed for the 0V activation process of the flow battery. By precisely regulating voltage, the system ensures smooth transition from the initial state to normal operation, providing a solid foundation for efficient system performance.     Leveraging its expertise in power electronics, FGI has developed a tailored solution for aqueous flow battery energy storage with the following features: Flexible 0V activation options – Multiple activation methods can be selected according to flow battery characteristics, making battery regeneration simpler and more convenient. Dedicated PCS for flow batteries – Fully compatible with flow battery BMS, achieving one-time grid connection at MW scale. Robust thermal design – Operates without derating at ambient temperatures up to 45°C, ensuring reliability under sand, heat, and extreme cold. Long lifecycle – Supports 20,000 deep discharge cycles with a design lifespan of up to 25 years, significantly reducing maintenance costs and replacement frequency.       FGI PCS Technology Advantages Fast islanding detection technology LVRT & HVRT (Low/High Voltage Ride-Through) capability Peak shaving and valley filling functionality Reactive power compensation & harmonic suppression Constant power and constant current charging/discharging modes Multi-machine parallel operation, scalable to MW-level systems       FGI 100kW DC/DC Technology Highlights Full-stack in-house development – Mastery of topology design, thermal simulation, and intelligent control technologies Rigorous validation – 67 reliability tests including salt spray, vibration, and high/low temperature cycling Fast response – Supports rapid customized design and development, with lifetime O&M services provided     Project Value and Significance Once commissioned, the project will: Enhance renewable energy integration capacity in the surrounding region Alleviate transmission pressure of renewable power export Improve grid flexibility and supply reliability Strengthen grid stability and safety ​ Furthermore, it provides a demonstration model for large-scale wind and solar integration, offering strong support for the construction of a new-type power system and promoting the sustainable and rapid development of renewable energy.

FGI has successfully delivered and installed its high-performance, self-developed High-Voltage Static Var Generator (SVG) for a leading steel manufacturer in Europe. This milestone marks a key step in expanding FGI’s high-end power quality solutions to the global market, setting a solid foundation for future international growth.       Designed specifically for the demanding power quality needs of the steel sector, the delivered SVG has now been installed at the customer’s modern production facility in Europe. Through close cooperation between FGI’s technical team and the client, installation was completed with high precision and efficiency. Commissioning is now about to begin, ready to deliver more stable and efficient power to the plant.       Steelmaking is highly energy-intensive and extremely sensitive to power quality. Rolling mills and electric furnaces can cause grid voltage fluctuations, flicker, and low power factor, directly affecting production efficiency, equipment life, and product quality. FGI’s high-voltage SVG addresses these challenges with:   1. Ultra-Fast Dynamic Response Advanced IGBT power devices and full-control technology enable millisecond-level tracking of load changes, delivering precise reactive power compensation and harmonic suppression to stabilize voltage and maintain continuous production.   2. High Efficiency and Energy Savings Boosts system power factor, reduces line losses and transformer load, lowers operational costs, and supports sustainable energy use.   3. Reliability in Harsh Conditions Engineered for high-temperature, dusty, and EMI-heavy environments in steel plants, with strong protection ratings and EMC performance to ensure long-term stability.   4. Modular, Easy-to-Maintain Design Modular architecture reduces maintenance costs, improves uptime, and meets the operational efficiency demands of modern plants.       This successful delivery and installation represents another major step forward in FGI’s global strategy: Recognized in High-End Markets – Meeting strict technical standards in Europe proves the international competitiveness of FGI’s products. Brand Influence Enhanced – Supplying a globally renowned steelmaker strengthens FGI’s position in the global industrial sector. Global Service Capability Proven – From manufacturing and international logistics to on-site installation, FGI has shown its ability to deliver complex projects worldwide. Strong Demonstration Effect – This project sets a benchmark for future European and global industrial market expansion.       Looking Ahead Installation marks a critical step toward full operation. FGI’s technical team is now working closely with the customer to prepare for commissioning. We are confident the SVG will ensure stable, efficient production for this European steel leader, helping it achieve superior energy management and sustainability goals. FGI will continue to invest in R&D, advance power quality technology, and deliver more intelligent, reliable solutions for industrial customers worldwide — bringing the green light of China’s intelligent manufacturing to the global stage.

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