High voltage SVG adopts H-bridge modular cascade technology, which can be directly connected to 35kV. Through phase-shifting carrier control technology, it can adjust the amplitude and phase of the output voltage at the AC side of the inverter in real time, quickly absorb or send out the required reactive power, so as to achieve the functions of stabilizing voltage, compensating reactive power, restraining voltage fluctuation and flicker, three-phase imbalance and so on.