Transient overvoltage calculation method of HVDC sending-end system under DC bipolar blocking
DOI：DOI: 10.19783/j.cnki.pspc.200214
Key Words:U-HVDC  DC blocking  sending-end AC system  transient overoltage
Author NameAffiliation
LI Xinyue 1. College of Electrical Engineering, Xinjiang University, Urumqi 830047, China
2. Changji Power Supply Company, State Grid Xinjiang Electric Power Co., Ltd., Changji 831100, China 
LI Fengting 1. College of Electrical Engineering, Xinjiang University, Urumqi 830047, China
2. Changji Power Supply Company, State Grid Xinjiang Electric Power Co., Ltd., Changji 831100, China 
YIN Chunya 1. College of Electrical Engineering, Xinjiang University, Urumqi 830047, China
2. Changji Power Supply Company, State Grid Xinjiang Electric Power Co., Ltd., Changji 831100, China 
BAI Haibin 1. College of Electrical Engineering, Xinjiang University, Urumqi 830047, China
2. Changji Power Supply Company, State Grid Xinjiang Electric Power Co., Ltd., Changji 831100, China 
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Abstract:A U-HVDC system’s transient overvoltage caused by DC blocking will threaten the safe operation of a system. Thus an analytic formula calculating transient voltage of the commutation bus after DC bipolar blocking is derived. Based on this, the equivalent model of the power network of the sending-end system is established, and the transient overvoltage calculation method of any key node of the AC system is derived. In order to judge the severity of the high voltage crossing problem faced by the new energy node and find the weak link of the system in advance, the impedance ratio is proposed to represent the transient overvoltage degree of the node. The voltage rise value of the node transient voltage increases linearly with the increase of the impedance ratio after DC bipolar blocking. Finally, the CIGRE HVDC standard test system and the Jiquan ±1100 kV DC transmission sending system are set up in the DIgSILENT simulation platform to verify the correctness of the transient overvoltage calculation method of HVDC sending-end system. This work is supported by National Natural Science Foundation of China (No. 51877185) and Xinjiang Uygur Autonomous Region Natural Science Foundation of China (No. 2016D01C036).
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