Research on Multi-mode Coordination Control Strategy of New- generation Synchronous Condensers and Capacitor Bank

In HVDC system, the coordinated control of reactive power compensation equipment in converter station is of great significance to improve the stability of DC system, especially the DC system with frequent fluctuation of DC transmission power. This paper presents a multi-mode coordinated control strategy for the coordination of the new-generation synchronous condensers and the capacitor bank, which mainly includes the steady-state voltage regulation mode of the converter bus voltage tracking rated voltage without static error, the automatic voltage control (AVC) mode of the converter station participating in the voltage regulation of the near-area AC system, and the short-circuit fault of the converter bus. Transient control mode to suppress voltage fluctuation and commutation failure. Finally, based on the actual engineering parameters, the proposed strategy is validated in the electromagnetic transient simulation software (PSCAD).The simulation results demonstrate the rationality and effectiveness of the proposed strategy.