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| Study of a Synthesized Unsymmetrical Optimal PWM Technique of Selective Harmonic Controlling for Cascaded H-Bridge Multi-Level Inverters |
| Bu Leping1, 2, Zhang Hui1, Liu Kaipei1, Qin Liang1, Yang Shangjin1, Fan Nian1, Cheng Wei1, Jiang Zheng1, Hu Xiaole1 |
| 1. Wuhan University Wuhan 430072 China 2. Naval University of Engineering Wuhan 430033 China |
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Abstract An improved unsymmetrical optimal pulse-width modulation (PWM) technique is proposed in this paper. The aim of this proposed technique is to decrease the relative calculation burden of a conventional unsymmetrical optimal PWM technique. The proposed optimal pulse pattern is synthesized by one well-known optimal pulse pattern of SHE (Selective Harmonic Elimination) technique and an unsymmetrical optimal pulse pattern. The transcendental mathematical equations are developed. Using the prior results of all complete solutions of SHE technique the solutions of the proposed equations are found by Newton iteration method. In particularly, a control range of a specific 5th harmonic is given by this proposed technique, and a three-dimensional diagram of switching angles about controlling of this harmonic according to its amplitude and phase angle is shown. Finally the modulation performance of the proposed technique for cascaded H-bridge inverters of line-voltage output is simulated and demonstrated by FFT analysis for its validity.Method
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Received: 07 March 2011
Published: 07 March 2014
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| Fund:This project is supported by National Nature Science Foundation of China (Grant No. 50977068).; Received July.6, 2010; revised March 7, 2011. |
| About author:: Bu leping male, born in 1965, professor, his research interests are power automation, measurement of technology, etc.Zhang Hui female, born in 1969, associate professor, her research interests include high-performance optimal pulse width modulation for high power converters, power active filtering, etc.(Correspondent author) |
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2011, Vol. 26 
