A novel charge balancing control approach for a single phase 9-level inverter based on fundamental modulation strategy

2016 IEEE 8th International Power Electronics and Motion Control Conference (IPEMC-ECCE Asia) Pub Date : 2016-07-14 DOI:10.1109/IPEMC.2016.7512901

Reza Barzegarkhoo, H. M. Kojabadi, Bagher Karami, Liuchen Chang

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引用次数: 2

Abstract

In this paper, a new scheme of charge balancing control method for a practical multilevel inverter (MLI) structure which is able to generate 9-level of output voltage with only one required dc voltage source is presented. The analyzed MLI's topology is made of using four series-connected capacitors paralleled by single dc power supply besides three bi-directional and four unidirectional power switches. Regarding the proposed method, in order to keep the across voltage of capacitors at the expected value, two operating switching modes (main and auxiliary modes) based on fundamental switching frequency are defined in which they are applied to the gate of power switches for a specific time duration and therefore they can obviate the discharging problem without aiming any extra charge balancing circuits or complicated modulation strategy. Several simulation results based on MATLAB/SIMULINK software are given to confirm the correct performance of proposed method.

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一种基于基波调制策略的单相9电平逆变器电荷平衡控制新方法

本文针对一种实用的多电平逆变器结构，提出了一种只需一个直流电压源就能产生9电平输出电压的电荷平衡控制新方案。所分析的MLI的拓扑结构是由4个串联电容器与单个直流电源并联构成的，另外还有3个双向和4个单向电源开关。在该方法中，为了使电容器的交叉电压保持在期望值上，定义了基于基频的两种工作开关模式(主模式和辅助模式)，并将其施加到功率开关的栅极上特定的时间，从而避免了放电问题，而无需额外的电荷平衡电路或复杂的调制策略。基于MATLAB/SIMULINK软件的仿真结果验证了所提方法的正确性。

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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2016 IEEE 8th International Power Electronics and Motion Control Conference (IPEMC-ECCE Asia)

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