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首页> 外文会议>Annual IEEE Applied Power Electronics Conference and Exposition >Fault-tolerant control strategy for T-type three-level inverter with neutral-point voltage balancing
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Fault-tolerant control strategy for T-type three-level inverter with neutral-point voltage balancing

机译：具有中性点电压平衡的T型三电平逆变器的容错控制策略

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摘要

In this paper, an improved fault-tolerant control strategy with neutral-point (NP) voltage balancing for T-type three-level inverter when an open-circuit fault occurs is proposed. Different from the existed fault-tolerant control strategies, this method can not only restore the output current but also balance the neutral-point voltage. The proposed strategy is illustrated by dividing fault into two conditions: the faulty condition of half-bridge switches and NP switches. When a half-bridge switch fails, the NP voltage is controlled by adjusting the amplitude of the three-phase reference voltages. In cases of the open-circuit fault in a NP switch, the balance and oscillations of the neutral-point voltage are considerably controlled by adding a proper offset value to switch turn-on times of three-phase reference voltages. The presented method does not require any additional hardware and complex calculations. Experimental results show the performance of the proposed control strategy.
机译：提出了一种改进的具有中性点（NP）电压平衡的T型三电平逆变器在出现开路故障时的容错控制策略。与现有的容错控制策略不同，该方法不仅可以恢复输出电流，而且可以平衡中性点电压。通过将故障分为两个条件来说明所提出的策略：半桥开关和NP开关的故障条件。当半桥开关发生故障时，可通过调节三相参考电压的幅度来控制NP电压。在NP开关出现开路故障的情况下，通过添加适当的偏移值以开关三相参考电压的接通时间，可以大大控制中性点电压的平衡和振荡。提出的方法不需要任何额外的硬件和复杂的计算。实验结果表明了所提出的控制策略的性能。

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