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A model predictive control based fault-tolerant control strategy for T-type three-level inverters

机译:T型三电平逆变器基于模型预测控制的容错控制策略

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Nowadays, research on the reliability improvement of T-type three-level inverters is studied as an important issue. In this paper, a novel fault tolerant control strategy based on model predictive control (MPC) is proposed for open-circuit faults in switch devices. When an open-circuit fault occurs to neutral-point switches, the impossible switching states of zero- and small-voltage vectors should be replaced by the redundancy switching states. In addition, to avoid the use of the impossible medium-voltage vectors, the weight coefficient should be set to infinity. In case of the open-circuit fault in half-bridge switches, the large-voltage vectors become impossible. In order to avoid the distortion of the output, only the possible zero and small voltage vectors are used to track the reference current. Furthermore, in order to guarantee the balance of neutral-point (NP) voltage for the 3LT2I, the weight coefficient of the small- and medium-voltage vectors which can influence the NP potential is properly modified. Simulation and experimental results are provided to verify the validity and feasibility of the proposed strategy.
机译:当今,研究提高T型三电平逆变器的可靠性是一个重要的课题。本文提出了一种基于模型预测控制(MPC)的新型容错控制策略,用于开关设备的开路故障。当中性点开关发生开路故障时,零电压和小电压矢量的不可能开关状态应由冗余开关状态代替。另外,为避免使用不可能的中压矢量,应将权重系数设置为无穷大。如果半桥开关发生开路故障,则无法使用大电压矢量。为了避免输出失真,仅使用可能的零电压和小电压矢量来跟踪参考电流。此外,为了保证3LT 2 I的中性点(NP)电压的平衡,适当修改了可能影响NP电位的中小电压矢量的权重系数。仿真和实验结果验证了所提策略的有效性和可行性。

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