Video for operation of WE inverters

This paper proposes a reduced switch count WEtype inverter topology that employs one DC source, nine IGBTs, and one AC-switch comprising of two antiparallel IGBTs, and two capacitors. It is capable of generating 1.5 times boosted 13- level output voltage and employs modified Nearest Level Control (NLC), which considers both zero states. An algorithm based on redundant states controls the voltage across the auxiliary DClink at Vdc/2. The paper presents a detailed mathematical model of the circuit and compares the inverter with other recently introduced 13-level inverter topologies on various parameters. The proposed topology shows its efficacy in working on different modulation indexes. Aside, a 7-level operation is possible even after the removal of the AC-switch. The inverter requires a single voltage sensor despite employing two capacitors, which reduces the inverter’s overall cost. The simulation and experimental verification demonstrate the effectiveness of the WE-type inverter topology.本文提出一种减少开关数量的WE型逆变器拓扑，该拓扑采用单个直流电源、9个绝缘栅双极型晶体管（IGBT）、一个由两个反并联绝缘栅双极型晶体管构成的交流开关以及两个电容器。该拓扑可实现1.5倍升压的13电平输出电压，并采用兼顾两种零状态的改进型最近电平控制（NLC）。基于冗余状态的算法可将辅助直流母线的电压控制为Vdc/2。本文给出了该电路的详细数学模型，并将该逆变器与近年提出的其他13电平逆变器拓扑在多项参数上进行了对比。所提拓扑在不同调制指数下均表现出优异性能。此外，即便移除交流开关，该拓扑仍可实现7电平运行。尽管采用了两个电容器，该逆变器仅需单个电压传感器，从而降低了整体成本。仿真与实验验证结果证实了该WE型逆变器拓扑的有效性。