A Single DC Source Switched-Capacitor Multilevel Inverter for High-Frequency AC System

P. S. Dash, S. Das
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Abstract

This paper presents a new switched-capacitor multi-level inverter (SCMLI). The proposed inverter can limit the charging current of switched-capacitor units. Voltage balancing of each capacitor is not required for the inverter. The capacitor voltages are automatically adjusted to the desired levels in each cycle of the ac voltage output. A step-change in the voltage is generated by switching the capacitors in series one after another. Usually, SCMLIs have a front-end switched capacitor configuration and a back-end full bridge inverter. The converter in the front-end steps up the dc voltage, and the back-end inverter generates ac output voltage. The elevated voltage from the front-end converter increases the voltage stress in the back-end H-bridge configuration. The proposed inverter doesn't need a back-end H-bridge inverter to generate ac output. A small inductance is introduced in series to the source to minimize the initial charging current in the multiple switched capacitor configurations. A lower dc capacitor charging current increases the overall efficiency and decreases the switching loss in the inverter. Circuit configuration, pulse width modulation (PWM) method, and operation principle are explained in detail. Finally, a simulation of the nine-level inverter is done in MATLAB, and simulation results validate the expected performance.
用于高频交流系统的单直流电源开关电容多电平逆变器
提出了一种新型的开关电容多级逆变器(SCMLI)。该逆变器可以限制开关电容单元的充电电流。逆变器不需要各电容的电压平衡。在交流电压输出的每个周期中,电容器电压自动调整到所需的水平。电压的阶跃变化是通过一个接一个地串联开关电容器而产生的。通常,scmli具有前端开关电容配置和后端全桥逆变器。前端的变换器升压直流电压,后端逆变器产生交流输出电压。来自前端变换器的升高电压增加了后端h桥结构中的电压应力。该逆变器不需要后端h桥逆变器来产生交流输出。在多个开关电容配置中,一个小电感串联到电源中以最小化初始充电电流。较低的直流电容充电电流可以提高逆变器的整体效率,降低逆变器的开关损耗。详细介绍了电路结构、脉宽调制(PWM)方法和工作原理。最后,在MATLAB中对该九电平逆变器进行了仿真,仿真结果验证了预期的性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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