Optimization control of neutral-point balance in three-phase four-wire three-level power conversion system
The traditional three-level neutral-point balance control method has a significant suppressive effect on neutral-point fluctuations under low imbalance,but needs improvement under high imbalance loads.In this artical,a neutral-point balance optimization control method based on the disassembly of zero level is proposed through real-time detection and ana-lysis of the degree of imbalance.When the degree of imbalance reaches the critical threshold,coordinated control is carried out on the disassembly area of zero level and disassembly amount to effectively suppress the neutral-point voltage fluctuation of the three-level three-leg power conversion system under high imbalance conditions.The simulation experimental results verify that the proposed method has good neutral-point potential balancing ability under various unbalanced load conditions.
power conversion systemthree-phase four-wire three-levelthe disassembly of zero levelneutral-point balance
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