Abstract：To improve the unbalanced output voltage and uneven power sharing of the parallel system under unbalanced conditions, a new sequential control method for three-phase four-leg inverter is proposed. Also, in order to weaken inherent common mode interference problem of three-phase four-leg inverter, which needs a neutral line, a high-frequency link matrix three-phase four-leg topology is used. Since the zero-sequence current in the system all flow through the fourth leg, the fourth leg and the other three legs can be separately controlled independently; In order to realize the capacity allocation of the parallel inverters, a virtual impedance matching drooping scheme without coupling under two-phase stationary coordinate is proposed for the first three bridge arms, while a separate virtual resistor control scheme used by the fourth bridge. Compared with the traditional one, The proposed control scheme optimizes the design structure of virtual impedance, removes the coupling between the axes and facilitates the design of the closed-loop controller. Also filters the current noise in some extent and improves the output voltage quality. Finally, it realizes a balanced output voltage and a sharing load power by capacity in the system of parallel high-frequency link matrix three-phase four-leg inverter under unbalanced conditions. The experiment and simulation results verify the correctness and feasibility of the proposed method.
闫朝阳, 孙喆, 宋雪微, 李建霞, 杨丽君. 不平衡工况下并联高频链矩阵式三相四桥臂逆变器分序控制[J]. 电工技术学报, 2019, 34(zk2): 560-572.
Yan Zhaoyang, Sun Zhe, Song Xuewei, Li Jianxia, Yang Lijun. Using Sequence Decomposition Control to Parallel High Frequency Link Matrix Three-Phase Four-Leg with Unbalanced Load. Transactions of China Electrotechnical Society, 2019, 34(zk2): 560-572.
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2019, Vol. 34 
