| 引用本文: | 田艳军,王坤,彭飞,孟凡奇,王毅.交流配电网中柔性直流互联装置阻抗稳定性分析及阻抗协同重塑控制[J].电力自动化设备,2021,41(5): |
| TIAN Yanjun,WANG Kun,PENG Fei,MENG Fanqi,WANG Yi.Analysis of impedance stability and impedance coordinated reshaping control for flexible DC interconnection device in AC distribution network[J].Electric Power Automation Equipment,2021,41(5): |
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| 摘要: |
| 对于交流配电网中的柔性直流互联装置，当功率方向变化时，负阻抗会随之在装置内定功率控制换流器的直流侧和交流侧进行转移，降低了系统稳定性。针对此问题，提出了一种阻抗协同重塑控制策略。首先，介绍了配电网中柔性直流互联装置的结构；其次，分别建立了装置内两侧换流器多个端口阻抗在功率双向传输下的小信号模型，探究其阻抗特性；然后，对所提控制策略的工作原理进行了分析，且对重塑后的阻抗进行了建模，对比分析了阻抗重塑前后系统的稳定性；最后，通过MATLAB/Simulink仿真模型和实验平台对所提控制策略的有效性进行了仿真和实验验证，结果表明所提方法通过协同作用可将直流侧和交流侧的负阻抗均重塑为正阻抗，从而能同时改善换流器两侧的稳定性。 |
| 关键词: 交流配电网 柔性直流输电 换流器 小信号建模 稳定性分析 阻抗协同重塑控制 |
| DOI：10.16081/j.epae.202105003 |
| 分类号:TM727;TM712 |
| 基金项目:河北省重点研发计划资助项目(19214405D)；中央高校基本科研业务费专项资金资助项目(2020MS089) |
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| Analysis of impedance stability and impedance coordinated reshaping control for flexible DC interconnection device in AC distribution network |
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TIAN Yanjun1, WANG Kun1, PENG Fei1, MENG Fanqi2, WANG Yi1
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1.Hebei Key Laboratory of Distributed Energy Storage and Microgrid, North China Electric Power University, Baoding 071003, China;2.State Grid Changzhou Power Supply Company, Changzhou 213004, China
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| Abstract: |
| For the flexible DC interconnection device in AC distribution network, when the power direction changes, the negative impedance will sequentially exist on DC side and AC side of the constant power-controlled converter in device, reducing system stability. In order to solve this problem, an impedance coordinated reshaping control strategy is proposed. Firstly, the structure of the flexible DC interconnection device in distribution network is introduced. Secondly, the small-signal models of impedance at each port of the converters on both sides under bidirectional power transmission are established to explore their impedance characteristics. Thirdly, the working principle of the proposed control strategy is analyzed, the reshaped impedances are remodeled, and the system stability before and after impedance reshaping is compared and analyzed. Finally, the effectiveness of the proposed control strategy is verified by MATLAB/Simulink simulation model and experimental platform. The results show that the proposed method reshapes the negative impedances of both DC and AC sides into positive impedances through coordinative effect, and can simultaneously improve the stability of both sides of converter. |
| Key words: AC distribution network flexible DC transmission electric converters small-signal modeling stability analysis impedance coordinated reshaping control |
