Optimal surplus harmonic distribution in selected harmonic elimination PWM technique for multilevel inverters

IECON'99. Conference Proceedings. 25th Annual Conference of the IEEE Industrial Electronics Society (Cat. No.99CH37029) Pub Date : 1999-11-29 DOI:10.1109/IECON.1999.816452

Li Li, D. Czarkowski, Yaguang Liu, P. Pillay

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引用次数: 6

Abstract

A concept of optimal surplus harmonics distribution in the selective harmonic elimination PWM technique for multilevel inverters is introduced in this paper. There are several performance indexes that can be optimized in PWM inverters, e.g., distortion factor, current or voltage total harmonic distortion or efficiency. Minimization of magnetic noise is selected as an example here. Several methods of alleviating the magnetic noise problems in PWM inverters, like harmonic decentralization and random PWM modulation, have been given in literature but only for three-level (single-cell) inverters. Numerical difficulties associated with a solution of PWM harmonic elimination equations for multilevel systems are overcome by using a nonconstrained optimization. Simulation and experimental results are presented for a double-cell series-connected voltage source PWM inverter. The theoretical and experimental results are in a very good agreement.

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多电平逆变器中谐波消除PWM技术的最优剩余谐波分布

介绍了多电平逆变器选择性谐波消除PWM技术中剩余谐波最优分布的概念。在PWM逆变器中有几个性能指标可以优化，如失真系数、电流或电压总谐波失真或效率。本文以磁噪声最小化为例。文献中已经给出了几种缓解PWM逆变器磁噪声问题的方法，如谐波去中心化和随机PWM调制，但这些方法仅适用于三电平(单细胞)逆变器。采用无约束优化方法克服了多电平系统PWM谐波消除方程求解的数值困难。给出了一种双单元串联电压源型PWM逆变器的仿真和实验结果。理论和实验结果吻合得很好。

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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IECON'99. Conference Proceedings. 25th Annual Conference of the IEEE Industrial Electronics Society (Cat. No.99CH37029)

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