| 引用本文: | 彭飞,孟凡奇,郁清云,马剑勋,田艳军,马鑫,魏大洋,吴淳.交流微电网直流互联系统背靠背变流器阻抗修正稳定性增强控制[J].电力自动化设备,2026,46(1):194-201 |
| PENG Fei,MENG Fanqi,YU Qingyun,MA Jianxun,TIAN Yanjun,MA Xin,WEI Dayang,WU Chun.Impedance correction and stability enhancement control of back-to-back converter in AC microgrid DC interconnection system[J].Electric Power Automation Equipment,2026,46(1):194-201 |
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| 摘要: |
| 在功率双向传输的交流微电网直流互联系统中，背靠背变流器的交、直流侧端口阻抗均会呈现负阻抗特性，大幅降低了系统稳定性。基于阻抗匹配理论，结合阻抗表达式和奈奎斯特稳定性判据，对比分析了功率正、反向传输下交流微电网直流互联系统的稳定性。针对传统控制下存在的负阻抗及功率正、反向传输导致的系统稳定性分析差异问题，提出了一种阻抗修正稳定性增强控制。该方法不仅能够将交、直流侧的负阻抗修正为正阻抗，还消除了直流侧端口阻抗间的相位差，提高了系统的稳定裕度，增强了系统的双向功率稳定性。通过MATLAB/Simulink仿真和小功率实验平台验证了所提策略的有效性，结果表明所提策略能够有效解决双向功率稳定性差异问题。 |
| 关键词: 交流微电网 背靠背变流器 小信号建模 稳定性分析 阻抗修正 |
| DOI：10.16081/j.epae.202505010 |
| 分类号:TM727;TM712 |
| 基金项目:河北省自然科学基金资助项目(E2022502032) |
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| Impedance correction and stability enhancement control of back-to-back converter in AC microgrid DC interconnection system |
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PENG Fei1, MENG Fanqi1, YU Qingyun1, MA Jianxun1, TIAN Yanjun2, MA Xin1, WEI Dayang1, WU Chun3
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1.State Grid Changzhou Power Supply Company, Changzhou 213004, China;2.Hebei Key Laboratory of Distributed Energy Storage and Microgrid, North China Electric Power University, Baoding 071003, China;3.College of Energy and Electrical Engineering, Hohai University, Nanjing 211100, China
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| Abstract: |
| In the AC microgrid DC interconnection system with bidirectional power transmission, the impedances of both AC and DC ports of back-to-back converters exhibit negative impedance characteristics, greatly reducing system stability. Based on the impedance matching theory, combined with impedance expression and Nyquist stability criterion, the stability of AC microgrid DC interconnection system under forward and reverse power transmission is compared and analyzed. An impedance correction and stability enhancement control is proposed to address the difference in system stability analysis caused by negative impedance and power forward and reverse transmission under traditional control. This method not only corrects the negative impedances of the AC and DC sides to positive impedances, but also eliminates the phase difference between port impedances of DC side, improves the stability margin of the system, and enhances the bidirectional power stability of the system. The effectiveness of the proposed strategy is verified through MATLAB/Simulink simulation and low-power experimental platform, and the results show that the proposed strategy can effectively solve the problem of bidirectional power stability difference. |
| Key words: AC microgrid back-to-back converter small signal modeling stability analysis impedance correction |
