Research on Voltage Compensation Measures Based on Reducing Commutation Failure and Converter Transformer Tap Loss

Commutation failure is one of the most common faults in HVDC transmission. The frequent action of converter transformer tap will shorten the service life and reliability of converter transformer, which may lead to commutation failure. In order to reduce the tap loss of converter transformer and suppress the occurrence of commutation failure, a method of voltage compensation with controllable voltage source on the valve side of converter transformer is proposed. Simulation results show that the proposed method not only greatly reduces the tap action of converter transformer, but also plays a certain role in restraining commutation failure.