GY-SVG-SiC-based Static Var Generator

Overview

Silicon Carbide Static Var Generator (GY-SVG-SiC)
Using silicon carbide (SiC) power devices as the core, the GY-SVG-SiC connects a voltage source converter (VSC) to the power grid via a filter in parallel. Its working principle is to dynamically and accurately compensate for reactive power in the grid system by adjusting the amplitude and phase of the output voltage on the AC side of the converter. The transient response time is less than 50􀀀μs, and the full response time is less than 10􀀀ms, thereby avoiding over-compensation and under-compensation. In addition, the device achieves a peak efficiency of over 98.5%. A single cabinet can accommodate up to 8 modules, with a maximum capacity of 800􀀀kvar, offering easy installation and maintenance.

Performance characteristics

1.DSP+CPLD full-digital control core, three-level topology technology, advanced reactive power detection algorithm and PWM control strategy.
2.Reduced module losses, improved module efficiency, peak efficiency up to 98.5% or higher.
3.High power density modular design; a single cabinet can accommodate 8 modules with a maximum capacity of 800 kvar, easy installation and maintenance.
4.Equipped with two external current sampling channels, supporting various compensation modes such as low-voltage side sampling with low-voltage side compensation, high-voltage side sampling with low-voltage side compensation, and reactive component compensation.
5.Higher switching frequency control algorithm reduces output ripple current and improves dynamic response speed.
6.Utilizes the higher voltage withstand capability of SiC power devices while simplifying thermal design and electromagnetic compatibility (EMC) design, enhancing product reliability.
7.Reactive power compensation capability: compensation rate ≥99%.
8.Unbalance compensation capability: unbalance degree after compensation ≤5%.
9.Dynamic response speed to load is millisecond-level, enabling accurate dynamic compensation for impact reactive power loads.
10.Neutral line zero-sequence current filtering capacity is three times that of the phase line.
11.Supports 100% current-limiting output to ensure long-term stable operation of the equipment.
12.Supports selectable compensation modes: reactive power compensation only, or reactive power compensation + three-phase unbalance compensation.