| 引用本文: | 万壮壮,徐海亮,葛平娟,刘春震,费壬翔.基于混合势函数的MMC大扰动稳定性分析及提升策略[J].电力自动化设备,2025,45(6):124-132. |
| WAN Zhuangzhuang,XU Hailiang,GE Pingjuan,LIU Chunzhen,FEI Renxiang.Mixed potential function based large disturbance stability analysis and enhancement strategy for MMC[J].Electric Power Automation Equipment,2025,45(6):124-132. |
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| 摘要: |
| 模块化多电平换流器(MMC)复杂的动态特性对大扰动下的系统稳定运行提出了挑战，严重时会导致系统失稳。基于混合势函数理论，研究MMC在电网电压跌落和负载功率扰动下的大干扰稳定性问题。建立MMC系统的简化平均模型，运用混合势函数得到系统大干扰稳定性判据，分析电压跌落和负载功率扰动对系统大扰动稳定性的影响；为了增强系统大干扰稳定能力，提出一种并联虚拟电阻的控制策略，并分析虚拟电阻取值对系统稳定性的影响规律。通过仿真算例验证了大干扰稳定性分析的正确性和所提策略的有效性。 |
| 关键词: 模块化多电平换流器 大干扰稳定性 虚拟电阻 混合势函数 稳定性 |
| DOI：10.16081/j.epae.202503018 |
| 分类号:TM46;TM712 |
| 基金项目:国家自然科学基金资助项目(52077222)；青岛市自然科学基金资助项目(23?2?1?78?zyyd?jch) |
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| Mixed potential function based large disturbance stability analysis and enhancement strategy for MMC |
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WAN Zhuangzhuang, XU Hailiang, GE Pingjuan, LIU Chunzhen, FEI Renxiang
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College of New Energy, China University of Petroleum(East China),Qingdao 266580, China
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| Abstract: |
| The complex dynamic characteristics of modular multilevel converter(MMC) challenges the system stable operation under large disturbance, which will lead to system instability in severe cases. Based on the mixed potential function theory, the large disturbance stability problems of MMC under grid voltage dip and load power disturbance are researched. A simplified average model of MMC system is established, the large disturbance stability criterion of the system is obtained by applying the hybrid potential function, and the effect of voltage dip and load power disturbance on the system large disturbance stability is analy-zed. In order to enhance the system stability ability under large disturbance, a control strategy of connecting virtual resistors in parallel is proposed, and the effect rule of virtual resistor value on the system stability is analyzed. The correctness of the large disturbance stability analysis and the effectiveness of the proposed strategy are verified by simulation examples. |
| Key words: modular multilevel converter large disturbance stability virtual resistor mixed potential function stability |
