DC Bias Active Defense System for AC Power Grid

doi:10.11930/j.issn.1004-9649.2016.02.090.06

Abstract

Abstract: In order to effectively prevent damage caused by DC bias, an active defense system for AC power grid is proposed. The system includes not only DC bias current risk evaluation and improvement for current network, but also evaluation and optimization for future grid expansion. A transformer DC bias evaluation method is proposed based on equivalent winding DC current. Taking Hubei power grid for example, winding DC currents of all transformers in Hubei power grid are reduced to below 10 A by adjusting operation method. Equivalent winding DC current of Yangjiawan Station drops by 62.4%, and that of Anfusi Station drops by 53.2%. Crossover and mutation of genetic algorithm module is used for optimizing stationing of DC bias suppression measures in Hubei power grid, after which the equivalent winding DC current of the whole system decreases by 50.95%. Artificial colony algorithm is used for optimization of substation site selection to minimize the DC bias risk of the new-built substation. Equivalent winding DC current of Chaoyang substation decreased by 71.3% after site optimization.

Key words: DC transmission, DC bias, active defense, operation method, site optimization, suppression measures, optimizing stationing

CLC Number:

TM863

XU Bichuan, WEN Xishan, ZHANG Lu, PAN Zhuohong, CHEN Wenguang, WEI Jian. DC Bias Active Defense System for AC Power Grid[J]. Electric Power, 2016, 49(2): 90-95.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.2016.02.090.06

https://www.electricpower.com.cn/EN/Y2016/V49/I2/90

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