Power Distribution Control between Cells with Imbalanced Load for Modular Multilevel Multiport Converter
Power Distribution Control between Cells with Imbalanced Load for Modular Multilevel Multiport Converter
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DOI：
10.1109/ecce-asia49820.2021.9479109
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发表时间：
2021-05
期刊：
影响因子：
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通讯作者：
T. Yasuda;Jun-ichi Itoh;G. Guidi
中科院分区：
文献类型：
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作者：
T. Yasuda;Jun-ichi Itoh;G. Guidi
提出了一种基于模块化多电平变换器（MMC）拓扑结构的多端口变换器单臂负载不平衡平衡控制方法。在负载不平衡的多端口变换器中，通过功率分配控制实现了三相电流的平衡。然而，多端口转换器对可以补偿的负载不平衡量有限制。本文推导了采用所提出的平衡控制对负载不平衡进行补偿能力的理论限制。仿真结果表明，该控制方法在负载不平衡的情况下仍能获得平衡的三相电网电流，直流链路电压误差控制在1.4%以内。此外，仿真和实验结果表明，与传统控制策略相比，所提出的控制器具有更大的负载不平衡补偿能力。
This paper proposes a balancing control method for load imbalance in one arm of a multiport converter based on a modular multilevel converter (MMC) topology. In the multiport converter with load imbalance, a balanced three-phase current is achieved thanks to power distribution control. However, the multiport converter has a limitation on the amount of load imbalance that can be compensated. This paper derives the theoretical limitation of the compensation capabilities using the proposed balance control for the load imbalance. The proposed control method is demonstrated by simulation, showing that balanced three-phase grid current is obtained in spite of the load imbalance and that the DC link voltage error is limited to 1.4%. In addition, simulation and experimental results clarify that the proposed controller has larger compensation capability for the load imbalance compared to the conventional control strategy.