Improved “K” type seven‐level switched capacitor inverter topology with Self‐voltage balancing,International Journal of Circuit Theory and Applications

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Improved “K” type seven‐level switched capacitor inverter topology with Self‐voltage balancing
International Journal of Circuit Theory and Applications ( IF 1.8 ) Pub Date : 2020-06-15 , DOI: 10.1002/cta.2811
M. Jagabar Sathik _{1,

2} , N. Sandeep ₃ , Dhafer Almakhles ₂ , Frede Blaabjerg ₄

Affiliation

This paper proposes an improved “K” type seven‐level switched capacitor inverter topology. The proposed topology consists of eight active switches, one floating capacitor, and two dc‐link capacitors. The floating capacitors are charged and discharged in each half‐cycle to maintain the capacitor voltage with the same value of the input voltage. The floating capacitor voltage is self‐balanced, and the output voltage is 1.5 times higher than the input voltage. To prove the superiority of the proposed topology, it is compared with the existing seven‐level inverters in terms of maximum voltage stress on the switch and required the number of power components. The simulation and experimental validation are carried out for 1.6 kW, 50 Hz using a laboratory‐based setup with a switching frequency of 5 kHz. The results are discussed highlighting the performance of the proposed topology for the dynamic load variations at different modulation indices. Both simulation results and experimental results have good agreement in terms of voltage balancing of flying capacitor.

中文翻译：

具有自电压平衡功能的改进型“ K”型七电平开关电容器逆变器拓扑

本文提出了一种改进的“ K”型七电平开关电容器逆变器拓扑。拟议的拓扑包括八个有源开关，一个浮动电容器和两个直流链路电容器。浮动电容器在每个半周期内进行充电和放电，以使电容器电压保持与输入电压相同的值。浮动电容器电压是自平衡的，输出电压是输入电压的1.5倍。为了证明所提出的拓扑的优越性，在开关上的最大电压应力和所需的功率组件数量方面，将其与现有的七级逆变器进行了比较。使用基于实验室的设置（开关频率为5 kHz）对1.6 kW，50 Hz进行仿真和实验验证。讨论了结果，突出了所提出的拓扑在不同调制指数下的动态负载变化的性能。仿真结果和实验结果在飞跨电容器的电压平衡方面都有很好的一致性。

更新日期：2020-06-15

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