中文说明：采用载波移相和PI控制器的（电流前馈解耦）STATCOM仿真，电路拓扑为H桥级联，实现了直流侧电压的平衡控制
English Description：
The simulation of STATCOM with carrier phase shift and PI controller (current feedforward decoupling) is adopted. The circuit topology is H-bridge cascade, which realizes the DC side voltage balance control