THE IMPACT OF HVDC COMMUTATION FAILURE ON THE DIRECTIONAL PROTECTION OF POWER-FREQUENCY COMPONENT VARIATION FOR TRANSMISSION LINES

摘要

The HVDC transmission has an influence on the operation of directional protection based on power-frequency component variation for AC transmission lines. Considering the features of directional protection principle based on power-frequency component variation, simulations based on CIGRE benchmark HVDC system are carried out to analyze the characteristics of equivalent DC-system impedance of power-frequency component variation during the commutation failures in the HVDC system. On this basis, the impact of HVDC commutation failures on the directional protection based on the power-frequency component variation is analyzed in the different situations of receiving end network, and simulation based on PSCAD/EMTDC is carried out to prove the correctness of theoretical analysis.