期刊
IEEE TRANSACTIONS ON POWER SYSTEMS
卷 36, 期 5, 页码 4764-4777出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPWRS.2021.3063276
关键词
Voltage control; Transient analysis; Rectifiers; Reactive power; HVDC transmission; Inverters; Circuit faults; Commutation failure; transient overvoltage; wind-thermal-bundled HVDC transmission system; reactive power control strategy
资金
- National Natural Science Foundation of China (NSFC) [51877185]
This paper investigates transient overvoltage issues caused by commutation failure (CF) in LCC-HVDC systems, and proposes constant reactive power control (CRPC) to suppress transient overvoltage. By controlling the reactive power consumed by the rectifier, the exchange of reactive power can be reduced, thus inhibiting transient overvoltage occurrences.
The commutation failure (CF) is the most common fault in line-commutated high voltage direct current (LCC-HVDC) systems that may lead to the transient overvoltage in the sending-side system. In the worst condition, the CF may lead to large-scale wind turbine tripping. To resolve this problem, the mathematical relationship between the reactive power consumed by the rectifier and DC voltage, DC current is derived. Then, a transient overvoltage calculation method is proposed in this paper. Furthermore, the mechanism of transient overvoltage caused by the CF is analyzed; it is revealed that the reason for three times transient overvoltage is the rapid decrease of the reactive power consumed by the rectifier during the CF and the recovery period from the CF. This paper proposes a constant reactive power control (CRPC) to inhibit transient overvoltage of the sending-side AC system. The proposed CRPC can increase the reactive power consumed by the rectifier, reduce the exchange reactive power between AC and DC systems, and suppress the transient overvoltage. A simulation model in PSCAD serves to verify the proposed CRPC on the transient overvoltage suppression in the situation of different fault types, fault duration, fault severity and short circuit ratio (SCR).
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