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| Adaptive leg-balancing control strategy of an MMC in an asymmetric AC grid fault |
| DOI：10.19783/j.cnki.pspc.230122 |
| Key Words:modular multilevel converter leg-balancing control arm current control unbalanced grid conditions zero-sequence voltage injection |
| Author Name | Affiliation | | YU Ji1 | 1. State Key Laboratory of Advanced Electromagnetic Engineering and Technology (Huazhong University of Science and
Technology), Wuhan 430074, China
2. School of Electrical Engineering, Zhengzhou University, Zhengzhou 450001, China
3. State Grid Shanghai Municipal Electric Power Company, Shanghai 200023, China
4. State Grid Shanghai
Electric Power Research Institute, Shanghai 200437, China | | YIN Xianggen1 | 1. State Key Laboratory of Advanced Electromagnetic Engineering and Technology (Huazhong University of Science and
Technology), Wuhan 430074, China
2. School of Electrical Engineering, Zhengzhou University, Zhengzhou 450001, China
3. State Grid Shanghai Municipal Electric Power Company, Shanghai 200023, China
4. State Grid Shanghai
Electric Power Research Institute, Shanghai 200437, China | | LAI Jinmu2 | 1. State Key Laboratory of Advanced Electromagnetic Engineering and Technology (Huazhong University of Science and
Technology), Wuhan 430074, China
2. School of Electrical Engineering, Zhengzhou University, Zhengzhou 450001, China
3. State Grid Shanghai Municipal Electric Power Company, Shanghai 200023, China
4. State Grid Shanghai
Electric Power Research Institute, Shanghai 200437, China | | HAN Xiangyu1 | 1. State Key Laboratory of Advanced Electromagnetic Engineering and Technology (Huazhong University of Science and
Technology), Wuhan 430074, China
2. School of Electrical Engineering, Zhengzhou University, Zhengzhou 450001, China
3. State Grid Shanghai Municipal Electric Power Company, Shanghai 200023, China
4. State Grid Shanghai
Electric Power Research Institute, Shanghai 200437, China | | CHEN Wei1 | 1. State Key Laboratory of Advanced Electromagnetic Engineering and Technology (Huazhong University of Science and
Technology), Wuhan 430074, China
2. School of Electrical Engineering, Zhengzhou University, Zhengzhou 450001, China
3. State Grid Shanghai Municipal Electric Power Company, Shanghai 200023, China
4. State Grid Shanghai
Electric Power Research Institute, Shanghai 200437, China | | HU Jiaxuan1 | 1. State Key Laboratory of Advanced Electromagnetic Engineering and Technology (Huazhong University of Science and
Technology), Wuhan 430074, China
2. School of Electrical Engineering, Zhengzhou University, Zhengzhou 450001, China
3. State Grid Shanghai Municipal Electric Power Company, Shanghai 200023, China
4. State Grid Shanghai
Electric Power Research Institute, Shanghai 200437, China | | DOU Zhenlan3 | 1. State Key Laboratory of Advanced Electromagnetic Engineering and Technology (Huazhong University of Science and
Technology), Wuhan 430074, China
2. School of Electrical Engineering, Zhengzhou University, Zhengzhou 450001, China
3. State Grid Shanghai Municipal Electric Power Company, Shanghai 200023, China
4. State Grid Shanghai
Electric Power Research Institute, Shanghai 200437, China | | SUN Pei4 | 1. State Key Laboratory of Advanced Electromagnetic Engineering and Technology (Huazhong University of Science and
Technology), Wuhan 430074, China
2. School of Electrical Engineering, Zhengzhou University, Zhengzhou 450001, China
3. State Grid Shanghai Municipal Electric Power Company, Shanghai 200023, China
4. State Grid Shanghai
Electric Power Research Institute, Shanghai 200437, China |
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| Abstract:A modular multilevel converter (MMC) has the problem of unbalanced power in asymmetric fault conditions. The conventional control method based on DC circulating current injection will cause asymmetry of arm current, resulting in unequal current of each phase. The method based on zero-sequence voltage injection may lead to over modulation and endanger the safe and stable operation of the system. Given the limitations of traditional leg-balancing control strategies, an adaptive leg-balancing control strategy of an MMC with asymmetric faults is proposed. First, the principle of leg-balancing based on zero-sequence voltage and DC circulating current injection is analyzed, and the limitations of different methods are pointed out. Second, the overmodulation boundary of the zero-sequence voltage injection method is studied, and the phase power distribution coefficient is introduced. Then the optimization method for a leg-power distribution coefficient with different faults is given and an adaptive leg-balancing control strategy of the MMC based on the coordination of zero-sequence voltage and DC circulating current is proposed. Finally, the correctness and effectiveness of the mechanical analysis and the proposed control strategy are verified by simulation. |
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