The Voltage Balance Control Strategy of Static Var Generators DC-Side Capacitors Based on Fuzzy-PI Adaptive Cascaded H-Bridge

A voltage balance control strategy based on the fuzzy adaptive PI (Proportional Integral control) is proposed to address problem of unbalanced capacitor DC side cascaded H-bridge static var generators (SVG). In strategy, introduced control. duty ratio correction added all levels’ public active power ratios, thereby realizing DC-side voltages at levels. test was conducted by building a single-phase three-H-bridge unit SVG simulation platform. The results show that can be controlled levels effectively. It has advantages simple structure, double closed-loop with decoupling system’s current DQ, no coupling effect, fast response speed, and high precision. exert good effect when system experiences sudden imbalance.