调制比对逆变器输出波形质量的影响

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摘要在电压源型逆变系统中, 一般选择输出电压作为受控量, 因为输出电压与负载无关, 常规采用电压谐波总畸变率THD作为衡量逆变器输出波形优劣的因子, 但高次谐波对电力系统影响较小, 低次谐波对电力系统影响很大, 因此采用更加合理的电压加权总谐波畸变WTHD作为逆变器输出波形质量的衡量因子, 考虑电压调制比对单相全桥纯电感负载逆变器输出电流波形的影响。首先, 提出电压调制比是影响逆变器输出电压WTHD影响因素之一;其次, 采用免疫遗传算法的数字式PWM控制策略, 编写C语言免疫遗传算法程序计算不同电压调制比时逆变器的最优控制序列, 使得其输出电压的WTHD最小, 负载电流波形最优, 进行仿真分析;最后, 基于数字信号处理器TMS320F2812搭建了实验平台, 进行了大量实验。仿真和实验数据表明, 为使得逆变器输出电压波形WTHD最小, 负载电流波形最优, 应当选择合适的电压调制比。

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	袁佳歆
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关键词 ：免疫遗传算法, 逆变器, 电压调制比, WTHD, DSP

Abstract：In voltage source inverter system, voltage is the general type selection as controlled variable, because output voltage has nothing to do with load. Conventional total harmonic distortion (THD) can be used as a evaluation factor of the output waveform. But in power system, low frequency component of the harmonic plays a greater influence than high frequency component, so this paper uses weighted total harmonic distortion(WTHD) as a evaluation factor of the output waveform, and consider the Influence of modulation to output waveform of the single-phase full bridge inverter with pure inductance load. Firstly, the paper proposes that the voltage modulation ratio was one of the factors influencing the output wave. Secondly, the paper adopts the digital control strategy based on immune genetic algorithm, and writs C language program to calculate the optimal control sequence of different voltage modulation, and simulated. Finally, the paper builds binlds experimental platform based on digital signal processing TMS320F2812, and does a lot of experiments. The data of the simulation and experimental resalts shows that the voltage modulation should be suitable in order to obtain the most optimal voltage wave of the inverter and the total harmonic distortion is the lowest.

Key words： Immune algorithm inverter voltage modulation WTHD DSP

收稿日期: 2010-11-02 出版日期: 2014-03-07

PACS:

TM46

基金资助:国家自然科学基金(50807041)、国家重点基础研究发展规划(973计划)(2009CB724506)资助项目

作者简介: 袁佳歆男, 1981年生, 博士, 副教授, 主要研究方向为电力电子技术、灵活交流输电技术。

引用本文:

袁佳歆, 饶斌斌, 刘俊博, 陈柏超. 调制比对逆变器输出波形质量的影响[J]. 电工技术学报, 2011, 26(1增): 142-147. Yuan Jiaxin, Rao Binbin, Liu Junbo, Chen Baichao. Influence of Modulation Rafio to Output Waveforms of the Inverter. Transactions of China Electrotechnical Society, 2011, 26(1增): 142-147.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2011/V26/I1增/142

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