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A Static Var Generator (SVG), also known as a STATCOM (Static Synchronous Compensator), is an advanced power electronics device used for dynamic reactive power compensation. Unlike traditional capacitor banks, an SVG provides high-speed, stepless control to maintain a stable power factor and grid voltage.
1. Core Operating Principle
An SVG operates as a controlled current source using Insulated Gate Bipolar Transistor (IGBT) technology and Pulse Width Modulation (PWM).
- Vector Control: The device creates an AC voltage waveform. By adjusting the amplitude of this output voltage relative to the grid voltage, it controls reactive power flow.
- Capacitive Mode: If the SVG's output voltage amplitude is higher than the grid voltage, it generates leading (capacitive) reactive power to the grid.
- Inductive Mode: If its output voltage amplitude is lower than the grid voltage, it absorbs excess reactive power, acting as an inductor.
- Real-Time Sensing: External current transformers (CTs) measure the load current, and a digital signal processor (DSP) calculates the required compensation in real time.
2. Key Technical Advantages
| Feature | SVG Performance | Traditional Capacitor Banks |
|---|---|---|
| Response Time | Ultra-fast: < 5ms | Slow: 20ms to several seconds |
| Adjustment | Stepless/Continuous | Discrete steps (leads to over/under compensation) |
| Compensation | Bidirectional (Capacitive & Inductive) | Unidirectional (Capacitive only) |
| Voltage Stability | Output is independent of grid voltage | Capacity drops as grid voltage drops |
| Harmonics | Actively filters harmonics (up to 15th-50th order) | Risk of harmonic resonance |
3. Primary Applications
- Renewable Energy: Stabilizing voltage fluctuations in solar and wind farms caused by intermittent generation.
- Heavy Industry: Managing rapid load changes from electric arc furnaces, rolling mills, and large motor startups to prevent voltage flicker.
- Data Centers & Hospitals: Ensuring high-precision power quality for sensitive electronic equipment.
- Grid Compliance: Meeting strict utility requirements for power factor (maintaining Cosφ ≥ 0.99) and harmonic distortion limits (IEEE 519).
4. System Components & Integration
- Modular Design: SVG units are often modular (e.g., 30kVAR to 150kVAR modules), allowing for easy expansion by paralleling multiple racks in a single cabinet.
- Hybrid Solutions: SVGs can be used alongside traditional capacitor banks; the capacitor bank handles the base load, while the SVG provides the "fine-tuning" and rapid response.
- Control Interface: Modern systems feature HMI screens and support communication protocols like Modbus, RS485, and Ethernet for remote monitoring and SCADA integration.
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How SVG compensation for leading reactive power?
Shanghai Yingtong Electric Co., Ltd
https://www.ytelect.com › blog › how-svg-compensatio...
Shanghai Yingtong Electric Co., Ltd
https://www.ytelect.com › blog › how-svg-compensatio...
Jun 26, 2024 — SVG, or Static Var Generator, is used to improve the power factor in electrical systems by compensating for reactive power.Read more
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Web results
What is a Static Var Generator? SVG Working Principles
Quality Energy
https://www.qualityenergy.com.au › what-is-static-var-g...
Quality Energy
https://www.qualityenergy.com.au › what-is-static-var-g...
Nov 14, 2022 — A Static Var Generator (SVG) is an electronic reactive power compensation system for capacitive and inductive power.Read more
Static Var Generator | SVG Reactive Power Solution
Greenventum Powertech Solutions
https://greenventumpowertechsolutions.com › static-var...
Greenventum Powertech Solutions
https://greenventumpowertechsolutions.com › static-var...
Advanced Static Var Generator for real-time reactive power compensation, voltage stability, and improved power quality in industrial systems.
⚡ Understanding Static Var Generator (SVG) and Its ...
LinkedIn · Manoj Kumar B S
10+ reactions · 7 months ago
LinkedIn · Manoj Kumar B S
10+ reactions · 7 months ago
What Is SVG? A Static Var Generator (SVG) is a power electronic device designed to provide dynamic reactive power compensation.
SVG dynamic reactive power compensator(DRPC)
ZDDQ
https://www.zddqelectric.com › svg-dynamic-reactive-po...
ZDDQ
https://www.zddqelectric.com › svg-dynamic-reactive-po...
SVG dynamic reactive power compensator(DRPC) is a power electronics-based device connected in parallel with the load that requires harmonics mitigation.Read more
SVG Dynamic Reactive Power Compensation in Offshore ...
IEEE
https://ieeexplore.ieee.org › document
IEEE
https://ieeexplore.ieee.org › document
by H Nie2025 — Example results show that SVG can not only suppress harmonics and improve power quality by quickly and precisely regulating system reactive power, but also ...Read more
What is Static Var Generator (SVG) ? - Sinava Power Solution
sinavapower.com
https://www.sinavapower.com › blog › what-is-static-var...
sinavapower.com
https://www.sinavapower.com › blog › what-is-static-var...
Jul 23, 2025 — A Static Var Generator, or SVG, is an advanced power electronics-based device used to provide dynamic reactive power compensation. Unlike ...Read more
How the SVG (Static Var Generator) Achieves Dynamic Pow...
hertzkron.com
https://www.hertzkron.com › blog › how-the-svg-static-...
hertzkron.com
https://www.hertzkron.com › blog › how-the-svg-static-...
Mar 12, 2026 — The key to achieving dynamic power factor correction lies in the vector control of the SVG (Static Var Generator) controlled voltage source.Read more
Dynamic Reactive Power Compensation – SVG
Edisonic Energy
https://edisonic.com.au › svg
Edisonic Energy
https://edisonic.com.au › svg
Capacitor‑free SVG device delivering ≤4 ms response, ≥99% efficiency and intelligent reactive power compensation for grids, renewables, ...