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首页> 外文期刊>Journal of control science and engineering >Fault-Tolerant Control Strategy for Neutral-Point-Clamped Three-Level Inverter
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Fault-Tolerant Control Strategy for Neutral-Point-Clamped Three-Level Inverter

机译：中性点钳位三电平逆变器的容错控制策略

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A fault-tolerant control technique is discussed for the Neutral-Point-Clamped (NPC) three-level inverter, which ensures that the NPC inverter operates normally even under device failures. A two-level leg is added to the NPC inverter; when the device open circuit fault occurs, the load of this faulty phase is connected to the neutral point of this two-level leg through the bidirectional thyristors. An improved Space Vector Pulse Width Modulation (SVPWM) strategy called “addition and subtraction substitution SVPWM” is proposed to effectively suppress fluctuation in capacitor neutral-point voltages by readjusting the sequence and action time of voltage vectors. The fault-tolerant topology in this paper has the advantages of fewer switching devices and lower circuit costs. Experimental results show that the proposed fault-tolerant system can operate in balance of capacitor neutral-point voltages at full output power and the reliability of the inverter is greatly enhanced.
机译：讨论了中性点钳位（NPC）三电平逆变器的容错控制技术，该技术可确保NPC逆变器即使在设备故障下也能正常运行。 NPC逆变器增加了两级支路;当发生设备开路故障时，该故障相的负载通过双向晶闸管连接到该二级桥臂的中性点。提出了一种改进的空间矢量脉宽调制（SVPWM）策略，称为“加减法SVPWM”，通过重新调整电压矢量的顺序和作用时间来有效抑制电容器中性点电压的波动。本文的容错拓扑具有减少开关设备和降低电路成本的优点。实验结果表明，所提出的容错系统可以在全输出功率下在电容器中性点电压的平衡下运行，并且大大提高了逆变器的可靠性。

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