Suppression Method of DC Magnetic Bias Based on Multi-DC Power Support

doi:10.3969/j.issn.1000-7229.2017.08.006

Abstract

Abstract: ABSTRACT： The conventional research of suppressing DC magnetic bias mainly focus on the development of DC magnetic bias blocking device, which cannot solve the DC magnetic bias fundamentally. This paper proposes a suppression method of DC magnetic bias based on multi-DC power support. Firstly, based on PSCAD/EMTDC, we establish a DC current distribution simulation model of transformer neutral point in Yichang power grid. Secondly, from the perspective of coordination running and power support between DC lines in the same transmission section, the transmission power of HVDC is reducd, which is operating in monopole-ground return mode, and the reduction of transmission power will be transferred by other HVDC projects in the same transmission section, to actively generate reverse unbalanced grounding current to neutralize the DC current in monopole-ground return line, which can reduce the amplitude of DC current at transformer neutral point in AC grid. Finally, the generation output of sending-end unit is optimized by genetic algorithm and then the static and transient stability of the sending-end grid after power transfer are verified based on PSASP simulation system.

Key words: suppression of DC magnetic bias, power transfer, generation output optimization, static stability, transient stability

CLC Number:

TM 722

LONG Bing, LIU Yuanqi, TANG Huaishou, HE Yingfa, XIE Zhicheng. Suppression Method of DC Magnetic Bias Based on Multi-DC Power Support

[J]. Electric Power Construction, 2017, 38(8): 42-.

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