Research on Digital Simulation Technology of H-bridge STATCOM Based on PSCAD/EMTDC and C language Interface

The reactive power compensation device plays an important role in improving the power quality and safety and stability of the power system. Three-phase H-bridge STATCOM topology has become a major structure in low-voltage system. The double-ring top-level control strategy based on PI and feedforward decoupling and the PSCAD and C interface technology are raised in this paper. On the one hand, the system main circuit is built by PSCAD / EMTDC software using its own power system and power electronic components. On the other hand, the program of instantaneous reactive power and SPWM modulation strategy based on C language is compiled, and PSCAD / EMTDC and C language interface is achieved. On the digital simulation platform, the instantaneous reactive power algorithm of three-phase H-bridge STATCOM and the contrast analysis of different SPWM modulation strategies are completed. The simulation results verify the feasibility of the digital simulation technology.