| 引用本文: | 朱帝,王菁月,刘闯,裴忠晨,孙赫阳.隔离型模块化多电平矩阵变换器工-低频端口带故障运行控制策略[J].电力自动化设备,2026,46(2):94-101,184. |
| ZHU Di,WANG Jingyue,LIU Chuang,PEI Zhongchen,SUN Heyang.Control strategy for fault operation at power/low-frequency ports of isolated modular multilevel matrix converter[J].Electric Power Automation Equipment,2026,46(2):94-101,184. |
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| 摘要: |
| 基于低频中压交流(LF-MVac)互联微电网的低频互联线路某一相退出运行时，其核心装备隔离型模块化多电平矩阵变换器(I-M3C)需要具备低频两相运行能力。若此时工频弱电网发生电压跌落，I-M3C同时需要具备主动电压支撑能力。介绍了基于LF-MVac互联微电网系统架构以及核心装备拓扑。分析了LF-MVac互联线路的两相运行特征，探究了工频弱电网故障期间虚拟同步发电机(VSG)故障电流的影响因素。结合基于虚拟正交量的单相dq变换设计了LF-MVac两相运行控制策略，利用同步机三阶模型设计了VSG控制策略，为工频弱电网提供主动支撑，并通过动态调节有功参考值实现故障电流抑制。在MATLAB/Simulink中搭建了10 kV/2 MW的I-M3C仿真平台，验证了I-M3C工/低频端口带故障运行控制策略的有效性。 |
| 关键词: 隔离型模块化多电平矩阵变换器 低频中压交流 互联微电网 两相运行 虚拟同步发电机 故障电流抑制 |
| DOI：10.16081/j.epae.202509011 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目(52477178) |
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| Control strategy for fault operation at power/low-frequency ports of isolated modular multilevel matrix converter |
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ZHU Di1, WANG Jingyue1, LIU Chuang1, PEI Zhongchen2, SUN Heyang1
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1.School of Electrical Engineering, Northeast Electric Power University, Jilin 132012, China;2.School of Electrical Engineering, Dalian University of Technology, Dalian 116024, China
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| Abstract: |
| In microgrids interconnected by low-frequency medium-voltage alternating current(LF-MVac),when one phase of the low-frequency interconnection line is out of operation, as its key equipment, the isolated modular multilevel matrix converter(I-M3C) needs to have the low-frequency two-phase operation abilility. If voltage drops in the power frequency weak grid during this moment, the I-M3C also needs to have the active voltage support abilility. The system architecture and key equipment topology of the interconnected microgrids based on LF-MVac are introduced. The two-phase operation characteristics of the LF-MVac interconnection line are analyzed, and the factors affecting the fault current of the virtual synchronous generator(VSG) during fault in the power-frequency weak grid are explored. The control strategy of LF-MVac two-phase operation is designed by a single-phase dq transformation based on virtual orthogonal quantities. Utilizing the third-order model of the synchronous machine, a VSG control strategy is designed to provide active support for power-frequency weak grids. And the fault current suppression is achieved through the dynamic regulation of the active power reference value. A 10 kV/2 MW I-M3C simulation platform is established in MATLAB/Simulink to verify the effectiveness of the control strategy for the fault operation at its power/low-frequency ports of I-M3C. |
| Key words: isolated modular multilevel matrix converter low-frequency medium-voltage alternating current interconnected microgrids two-phase operation virtual synchronous generator fault current suppression |
