Droop Control Based Auxiliary Power Compensation for Power Systems with Flexible DC Transmission

doi:10.11930/j.issn.1004-9649.202203039

Abstract

Abstract: At present, the droop control strategy is widely used in modularized multilevel converter stations in multi-terminal flexible DC interconnection system, and the voltage and active power can be adjusted autonomously according to the droop characteristic curve. However, this strategy can barely handle the abnormal DC side voltage fluctuation caused by power flow reversal and outage of the converter station. Therefore, the linear model of converter station based on droop control strategy is firstly established in this paper, which shows that droop control increases the difficulty of meeting the demand of emergent conditions. On this basis, an improved droop control strategy based on auxiliary power compensation was proposed to solve the problem of DC side voltage mutation under emergent conditions. Compared with traditional droop control, this strategy does not need to change the control parameters of converter station. The reaction speed is faster, indicating stronger voltage fluctuation suppression capability. Meanwhile, the performance of the DC interconnection system to cope with sudden working conditions is optimized. Simulation results verify the effectiveness of the proposed control strategy.

Key words: multi-terminal flexible DC interconnection, converter station, droop control, auxiliary power compensation, DC side voltage

LIN jinjiao, KONG Xiangping, WANG Chuyang, ZHANG Qiuyue, ZHENG Junchao, ZHANG Li. Droop Control Based Auxiliary Power Compensation for Power Systems with Flexible DC Transmission[J]. Electric Power, 2023, 56(4): 119-129.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202203039

https://www.electricpower.com.cn/EN/Y2023/V56/I4/119

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