Power Component Fault Detection Method and Improved Current Order Limiter Control for Commutation Failure Mitigation in HVDC
摘要：Guo, C. ; Chunyi Guo is with the State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing, 102206, China (e-mail: chunyiguo@gmail.com). ; Liu, Y. ; Zhao, C. ; Wei, X.
A power component detection (PCD) method and an improved current order limiter control (improved COL) are proposed to mitigate the commutation failure in Line commutated converter based high voltage direct current (LCC-HVDC). Integrating the instantaneous voltage and instantaneous current characteristics under single-phase and three-phase to ground faults, a fault detection method based on power component is proposed, and the corresponding setting principle is presented. Then, an improved dc current order limiter is introduced. To evaluate the effectiveness of the proposed methods, a dual-infeed HVDC system is developed in PSCAD/EMTDC, and the presented methods are also implemented. The transient performances of dual-infeed HVDC, under single–phase and three-phase to ground faults at the inverter AC busbar of one LCC-HVDC link, are investigated. Simulation results show that the PCD method, with the voltage and current components as an additional judgment criterion, is more sensitive to detect the single-phase and three phase faults, and even more reliable than the detect method taking only voltage or current components for faults recognition. It also can be concluded that the improved COL integrating with the advancing firing angle control has the ability to make the LCC-HVDC less susceptible to commutation failure. Finally, the improvement of commutation process by improved COL is further demonstrated.