计及换流站间电压误差的VSC-MTDC系统自适应下垂控制

doi:10.19595/j.cnki.1000-6753.tces.190722

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摘要针对多端柔性直流（VSC-MTDC）输电系统中各换流站之间功率协调控制的问题,提出一种计及换流站间电压误差的自适应下垂控制策略。该策略考虑多个换流站间直流电压的误差对功率调节的影响,当直流电压达到允许的波动极限时,所有采用自适应下垂控制的换流站几乎同时达到或接近满载,可以最大限度地利用换流站的有功功率容量,提高了按换流站功率裕度分配不平衡功率的准确性。此外,下垂系数根据换流站的可用功率变化量和允许电压变化量灵活调节,可使直流侧电压波动显著降低。仿真结果验证了所提控制策略的可行性和有效性。

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关键词 ：多端柔性直流输电, 自适应下垂控制, 协调控制, 功率裕度

Abstract：Aiming at the problem of power coordination control among converter stations in VSC-MTDC system, an adaptive droop control strategy considering DC voltage errors among converter stations is proposed. The strategy considers the influence of DC voltage errors among converter stations on power regulation. When the DC voltage reaches the allowable fluctuation limit, all converter stations with adaptive droop control reach or approach full load almost at the same time. It can maximize the active power capacity of converter stations, and improve the accuracy of unbalanced power distribution according to the power margins of converter stations. In addition, the droop coefficient can be flexibly adjusted according to the available power and the allowable voltage of the converter station, which can significantly reduce the voltage fluctuation on the DC side. The simulation results verify the feasibility and effectiveness of the proposed control strategy.

Key words： Voltage source converter multi-terminal DC adaptive droop control coordinated control power margin

收稿日期: 2019-06-17

PACS:

TM721.1

基金资助:国家自然科学基金资助项目（51607069）

通讯作者: 刘英培女,1982年生,博士,副教授,研究方向为直流输电、新能源发电并网技术等。E-mail：liuyingpei_123@126.com

作者简介: 解赛男,1992年生,硕士研究生,研究方向为多端柔性直流输电系统控制。E-mail：xiesai1992@qq.com

引用本文:

刘英培, 解赛, 梁海平, 谢乾. 计及换流站间电压误差的VSC-MTDC系统自适应下垂控制[J]. 电工技术学报, 2020, 35(15): 3270-3280. Liu Yingpei, Xie Sai, Liang Haiping, Xie Qian. Adaptive Droop Control Strategy for VSC-MTDC System Considering DC Voltage Errors Among Converter Stations. Transactions of China Electrotechnical Society, 2020, 35(15): 3270-3280.

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