Design of H-bridge based converter module used in cascaded DSTATCOM

The fundamental building block of cascaded static synchronous compensator used in distribution grid is H-bridge based converter module. In this paper a type of "plug and play" module was introduced to improve the device compensation performance and reliability. The module based on IGBT parallel connection was discussed about the design of electrical parameters and physical structure. In order to improve the module flexibility and anti-interference a universal module controller integrates with functions of control, communication, DC voltage sampling, fault detection and module protection was developed on complex programmable logic device. Dedicated driver cores were applied to improve the stability of HCM. Module function and stability are verified by experiment carried out on HCM experimental platform and industrial prototype.