PWM整流器轻载条件下网侧电流谐波分析与抑制

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摘要 PWM整流器在轻载时网侧电流总谐波畸变率通常较高。针对这一现象,详细分析其网侧电流谐波的产生机理,指出死区效应、驱动信号谐波和电网电压谐波是导致网侧电流畸变的主要因素,并给出相应的谐波计算方法。针对网侧电流谐波成因复杂、很难准确补偿的特点,提出一种抑制网侧电流谐波的自适应余弦内模控制方法,有效抑制了5、7、11、13、17、19等特征次谐波,并使其对系统稳定性的影响得到有效降低。实验结果验证了理论分析的正确性和控制方法的有效性。

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	刘博
	贲洪奇
	白银龙
	孙绍华

关键词 ： PWM整流器, 谐波分析, 余弦内模, 轻载, 网侧电流, 谐波抑制

Abstract：Current harmonics in grid side of pulse width modulation (PWM) rectifiers are usually high during light load. Aiming at this phenomenon, causes of the harmonics are analyzed in detail. This paper points out that dead time effect, harmonics of drive signals and harmonics of the grid voltage are the main reasons that leads distortions in grid current, and the computing methods of the harmonics are given accordingly. Because the grid side current harmonics have complicated components and are difficult to be compensated accurately, a new method with adaptive cosine internal model controllers to suppress grid side current harmonics is proposed. Then the low order harmonics (5th, 7th, 11th, 13th, 17th and 19th) are suppressed effectively, and the influence on stability of the system decreases. Finally, simulations and experiments verify the correctness of analysis and rationality of control method.

Key words： PWM rectifier, harmonics analysis, cosine internal model, light load, grid side current, harmonics suppression

出版日期: 2017-01-04

PACS:

TM461

作者简介: 刘博男,1992年生,博士研究生,研究方向为高功率因数整流器控制技术。E-mail: hiteelb@163.com（通信作者）贲洪奇男,1965年生,教授,博士生导师,研究方向为高频功率变换技术及有源功率因数校正技术。E-mail: benhq@hit.edu.cn

引用本文:

刘博, 贲洪奇, 白银龙, 孙绍华. PWM整流器轻载条件下网侧电流谐波分析与抑制[J]. 电工技术学报, 2016, 31(增刊): 162-168. Liu Bo¹, Ben Hongqi¹, Bai Yinlong¹, Sun Shaohua². Analysis and Suppression of Current Harmonics in Grid Side of PWM Rectifiers during Light Load. Transactions of China Electrotechnical Society, 2016, 31(增刊): 162-168.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2016/V31/I增刊/162

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