Abstract
Commutation failure at the inverter side of an MIDC (multi-infeed HVDC) is usually caused by AC system faults. Suppose the converter bus voltage cannot recover to the normal operation level in time: in that case, the commutation failure will then develop into more severe subsequent commutation failures or even DC blocking, which will severely threaten the security and stability of the system. Dynamic reactive power compensation equipment (DRPCE) can offer voltage support during accident recovery, stabilize voltage fluctuation and inhibit any subsequent commutation failure risk. This paper proposes the optimal DRPCE configuration scheme for maximizing both inhibitory effect and economic performance. The simulation results on MATLAB-BPA prove the scheme’s correctness and rationality, which can effectively inhibit the risk of subsequent commutation failure and obtain economic benefits.
Highlights
If the converter bus voltage fails to recover to the normal level, it may develop into subsequent commutation failures in an MIDC, resulting in system derating operation or even DC blocking [3]
Based on the above research, this paper proposes an optimal configuration scheme for Dynamic reactive power compensation equipment (DRPCE) to inhibit the risk of subsequent commutation failure in MIDC
Based on the mechanism of subsequent commutation failure, this paper proposes a DRPCE configuration scheme to maximize both the economic performance and the risk-inhibitory effect of subsequent commutation failure in an MIDC
Summary
HVDC technology has played an increasingly significant role in longdistance transmission projects in China [1]. The thyristor converter valves used in the HVDC converter station have no self-closing ability. AC system faults lead to the sudden drop of converter bus voltage, which can lead to commutation failure [2]. If the converter bus voltage fails to recover to the normal level, it may develop into subsequent commutation failures in an MIDC, resulting in system derating operation or even DC blocking [3]. Converter stations have a very close electrical connection with each other. It is necessary to take corresponding measures to inhibit the risk of an MIDC commutation failure. How to choose a reasonable configuration scheme, seems to be of prominent practical and applicable significance
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