WindSun Science & Technology Co.,Ltd.
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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:
When the output voltage is lower than the grid voltage, the SVG operates in an inductive mode, absorbing reactive power (acting like a reactor).
When the output voltage is higher than the grid voltage, it operates in a capacitive mode, supplying 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 choice of connection depends on the grid voltage level at the point of interconnection and the required compensation capacity.
The system uses a cascaded H-bridge topology, and the connection structure can be configured as either star (Y) or delta (Δ), depending on the application requirements.
1. Intelligent Human-Machine Interaction, Simplified Commissioning
FGSVG features an intelligent startup self-check function, significantly reducing commissioning complexity and shortening the deployment cycle. With intuitive operation and optimized user interface, it delivers a seamless user experience for operators and maintenance teams.
2. Advanced Recording and Diagnostic Functions
Equipped with real-time waveform recording and fault trace analysis, including a 16-channel oscilloscope function, FGI’s SVG enables precise monitoring and fast troubleshooting during operation.
3. Self-Adaptive Phase Sequence Recognition
No need to manually determine phase sequence — the system automatically identifies and adapts, further streamlining installation.
4. Multi-Level Networking, Seamless Capacity Expansion
FGSVG supports high-speed optical fiber communication (10M/10km), enabling ring-networked, master-slave parallel operation across multiple devices. This design supports easy reactive power capacity expansion, fully addressing users’ scalability concerns.
5. Intelligent Operating Mode Switching
The system automatically switches between normal and fault operating modes. Especially useful in critical applications such as railway substations where automatic adaptation is needed during bus tie switch operations.
6. Remote Monitoring via APP & Flexible Communication Interfaces
Monitor industrial equipment anytime, anywhere via mobile APP. FGI SVG offers rich communication interfaces including RS485, CAN, Ethernet, and GPRS. It is fully compatible with major industry protocols such as Modbus-RTU, Profibus, CDT91, and IEC104.
The full series uses instantaneous reactive power theory with a controller response time ≤1ms and full power response time ≤5ms, making it ideal for applications requiring strict reactive power response times, such as steel rolling, steelmaking, lifting, and impact loads.
The system compensates for negative sequence current caused by load imbalances, ensuring balanced three-phase current and improving power quality in the grid.
Supports several operation modes to meet different needs: constant reactive power, constant power factor, constant voltage, negative sequence compensation, etc. It allows for online mode switching or custom curves as per customer needs.
Effectively compensates for harmonics up to the 13th order, reducing risks of malfunctioning protection devices, capacitor module damage, transformer overheating, motor instability, and interference in communications.
SVG devices installed on long transmission lines improve voltage, reduce losses, and provide quick reactive power regulation in fault conditions, enhancing system stability.
SVG adjusts reactive power to keep the power factor at target levels, preventing penalties for low power factor or overcompensation that might cause instability in the grid.
Three levels of protection (device, system, and component level), with fast response times, safeguard the device from faults like overcurrent or overload.
Real-time monitoring of input/output current and voltage with waveform display, harmonic analysis, and easy access to system data for effective troubleshooting.
Automatically records 200 points (100ms) of data before and after protection actions for quick maintenance and fault diagnostics.
Supports Ethernet, RS485, CAN, and fiber optic communication interfaces, with protocols like MODBUS, ProfiBUS, and IEC61850 for remote monitoring and operation.
Modular power units and control systems facilitate large-scale production and easy on-site installation and maintenance.
Designed for safe online operation without the need for downtime, making it easy to replace filters and check data while the equipment is running.
Monitors the temperature of each power unit, and triggers alarms if the temperature exceeds set thresholds, preventing issues like fan failure or filter clogging.
Supports parallel operation of multiple SVG units for easy capacity expansion without system interruptions. In case of failure, the system automatically switches to parallel mode.
SVG can automatically adjust to voltage drops or surges within the national standard range, resuming normal operation without manual intervention.
Effectively compensates for voltage fluctuations and flickers caused by load changes, such as arc furnaces, rolling mills, and compressors.
Dual power supply options (380VAC, 2200VAC, or 220VDC) with hot-swappable, seamless switching in case of a power outage.
The cabinet is designed with anti-interference features and passes EMC tests, ensuring reliable performance in electrically noisy environments.
IP44-rated equipment is available for harsh environments with high dust or humidity, offering superior protection.
Indoor Cleanliness
Ensure the installation environment is clean and dry. Accumulated dust may affect system performance and cooling.
Pest Control
Implement anti-rodent measures to prevent small animals from entering the SVG cabinet and causing damage.
Temperature Management
Maintain an indoor ambient temperature below 38°C. When temperatures rise, use ventilation or air conditioning to cool the area.
Post-Startup Fastening Check
About one week after commissioning, shut down the device and disconnect the main power. Tighten all conductive connections, grounding screws, and bolts to ensure reliable contact.
Daily Inspection
Inspect SVG status daily. If unusual noises are heard, airflow is weak or absent, or abnormal smells (especially ozone) are detected:
Immediately shut down and disconnect power.
Check for obstructions in the air intake, clogged exhaust ducts, or fan failure.
Replace cooling fans or clean ducts as needed.
Contact the manufacturer if persistent abnormality occurs.
Schedule a shutdown at least once per year to inspect internal components:
Open one power unit and examine the capacitors.
Ensure film capacitors have a smooth, glossy black surface and intact seals.
Location: Zhengzhou City, Henan Province
Compensation Capacity: -2000kvar to +2000kvar
System 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
Location: Yantai City, Shandong Province
Compensation Capacity: -10000kvar to +10000kvar
System 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
Location: Xuzhou City, Jiangsu Province
Compensation Capacity: -4000kvar to +4000kvar
System 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)