科研之友
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摘要
After the asymmetrical fault occurs in the alternating current（AC） system on the inverter side，it is easy to cause continuous commutation failure，which threatens the safe and stable operation of the grid. In order to solve this problem，based on the response law of the high voltage direct current（HVDC） control system after an asymmetric fault，the fault and recovery process is divided into two stages according to the steady-state operation curve of the HVDC system. There is a trend that the commutation area demand gradually increases while the maximum supply of commutation area gradually decreases in Stage 2，i.e. steady fault recovery stage. There is still a deviation between the command value and the actual value of the firing angle during this process，and the deviation of the firing angle will further reduce the maximum supply of the commutation area，which is an important cause of continuous commutation failure. Based on this，the source of firing angle deviation and the influence of firing angle deviation on the HVDC control system are analyzed，and a continuous commutation failure suppression measure based on firing angle deviation compensation is proposed and verified based on the CIGRE HVDC benchmark model in PSCAD／EMTDC. The simulative results show that the proposed measures can effectively suppress the continuous commutation failure. ? 2023 Electric Power Automation Equipment Press.
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