Simulation Study on Dynamic Reactive Power Demand Characteristics after Commutation Failures of an HVDC Transmission System

This study focuses on the dynamic reactive power demand characteristics of an HVDC transmission system after commutation failures caused by inverter terminal AC network faults. The electromagnetic transient simulation method is adopted in the study, and the model of the DC main circuit represents the same configurations as the actual bipolar ± 500kV DC transmission system. The HVDC controls were modeled using detailed representation for all control functions of the real control system. The typical AC system faults which induce commutation failures of the inverters were simulated and simulation results were investigated. The study results can be used for exploring the interaction between HVDC transmission links and the receiving AC systems, and for the design of dynamic reactive power compensation at inverter stations.