FGI 33kV~35kV Indoor Type Static Var Generator with Liquid Cooling  — Ultra-Fast Response, Intelligent Compensation, and Modular Design

The SVG (Static Var Generator) operates by connecting a voltage-source converter (VSC), composed of a self-commutated bridge circuit using IGBT devices, in parallel with the power grid through a transformer or reactor. By controlling the switching of the IGBT modules, the DC voltage is converted into an AC output with adjustable amplitude and phase.

For an ideal SVG with negligible active power loss, reactive power compensation is achieved solely by adjusting the output voltage amplitude:

• Inductive mode: When the output voltage is lower than the grid voltage, the SVG absorbs reactive power (acting like a reactor)
• Capacitive mode: When the output voltage is higher than the grid voltage, it supplies reactive power (acting like a capacitor)

SVG systems are categorized into:

• Direct-connection type: Typically used for 6kV, 10kV, and 35kV applications
• Step-down connection type: Generally applied on a 10kV low-voltage side

The system uses a cascaded H-bridge topology, and the connection structure can be configured as either star (Y) or delta (Δ), depending on application requirements.

• Intelligent Human-Machine Interaction: Features intelligent startup self-check function, reducing commissioning complexity and shortening deployment cycle
• Advanced Recording and Diagnostics: Real-time waveform recording and fault trace analysis with 16-channel oscilloscope function
• Self-Adaptive Phase Sequence Recognition: Automatically identifies and adapts to phase sequence
• Multi-Level Networking: Supports high-speed optical fiber communication (10M/10km) for ring-networked, master-slave parallel operation
• Intelligent Mode Switching: Automatically switches between normal and fault operating modes
• Remote Monitoring: Mobile APP monitoring with rich communication interfaces (RS485, CAN, Ethernet, GPRS)

Utilizing instantaneous reactive power theory, the controller achieves a response time of ≤1ms and full power response within 5ms. Ensures fast and accurate compensation for demanding applications.

Suppresses negative sequence currents and mitigates harmonics up to the 13th order, protecting transformers, motors, and communication systems.

Supports multiple modes: constant reactive power, power factor, voltage control, and negative sequence compensation with real-time mode switching.

Multi-level protection with rapid fault response and built-in early warning monitors for key temperatures.

Full waveform capture, harmonic analysis, and black box recording stores 100ms of data before and after any fault event.

IP44-rated enclosures available, compliant with EMC standards, with optional dual power supplies (AC/DC).

• Maintain clean, dry installation environment free of dust accumulation
• Implement pest control measures to prevent animal intrusion
• Maintain ambient temperature below 38°C with proper ventilation
• Conduct post-startup fastening checks after one week of operation
• Perform daily inspections for unusual noises, weak airflow, or abnormal smells
• Schedule annual preventive maintenance including capacitor inspection

Ferroalloy Furnace Application in Zhengzhou, Henan

Compensation Capacity: -2000kvar to +2000kvar

System Voltage: 6kV

Results:

• Significant reduction in three-phase imbalance
• Power factor improved to meet utility requirements
• Stable furnace operation under optimized power conditions

Wind Power Station Application in Yantai, Shandong

Compensation Capacity: -10000kvar to +10000kvar

System Voltage: 35kV

Results:

• System voltage stabilized within 35.5-35.7kV
• Real-time power factor raised to 0.96
• Compliant with GB/T 12325-2008 and GB/T 14549-1993 standards
• Supports Low Voltage Ride-Through (LVRT) requirements

• Renewable energy integration: Stabilizes voltage fluctuations in solar and wind farms
• Industrial power quality: Dynamic current compensation for heavy industrial loads
• Grid stability: Voltage regulation for long-distance power transmission

With over 50 years of R&D experience since 1970, we are fully capable of meeting international grid standards. For the past 20 years, we have specialized in SVG product development, delivering proven solutions for power quality challenges.