基于单周控制的三相PWM整流器负序电压补偿型不平衡控制策略

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摘要针对三相脉宽调制(PWM)整流器在电网电压不平衡条件下的控制问题, 提出一种基于单周控制的三相PWM整流器负序电压前馈补偿型不平衡控制策略。该控制策略在单周控制的基础上采用电网负序电压对三相PWM整流器电网电流反馈量进行前馈补偿, 无需实时计算电网电流的正、负序分量, 仅使用1个比例积分(PI)直流电压外环控制器即可实现三相PWM整流器恒有功功率控制, 简化了系统控制结构。仿真和实验结果表明, 该控制策略可从根本上抑制三相PWM整流器在电网电压不平衡条件下直流侧电压2次谐波和电网电流谐波, 大大优化了三相PWM整流器不平衡运行性能。

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	徐友
	郑建勇
	梅军
	姚磊

关键词 ：三相PWM整流, 单周控制, 电网电压不平衡, 恒有功功率控制, 电压跌落

Abstract：Considering solution to the control problem of three-phase pulse width modulation (PWM) rectifier under unbalanced input grid voltages, a negative sequence voltage feed forward compensation unbalanced control strategy for three-phase PWM rectifier based on one cycle control is proposed in this paper. The control strategy adopts only one DC voltage proportional integral(PI) controller to regulate the instantaneous active power to a constant value without any ripple. Therefore, the system control structure is simplified and extraction for positive and negative sequence components of grid currents is not needed any more. Simulation and experimental results indicate that the control system eliminate the second harmonic waves of DC voltage and harmonic waves of AC currents entirely. And the unbalanced performance of three-phase PWM rectifier is optimized greatly.

Key words： Three-phase PWM rectify one cycle control unbalanced input grid voltages invariant active power control voltage dip

收稿日期: 2011-07-19 出版日期: 2014-03-20

PACS:

TM461

基金资助:国家高技术研究发展计划(863计划) 资助项目(2008AA05Z421)。

作者简介: 徐友男, 1978年生, 讲师, 博士研究生, 研究方向为电力电子和新能源发电系统故障穿越技术。郑建勇男, 1966年生, 教授, 博士生导师, 研究方向为电力电子和新能源发电。

引用本文:

徐友, 郑建勇, 梅军, 姚磊. 基于单周控制的三相PWM整流器负序电压补偿型不平衡控制策略[J]. 电工技术学报, 2012, 27(11): 183-190. Xu You, Zheng Jianyong, Mei Jun, Yao Lei. Negative Sequence Voltage Feed Forward Compensation Unbalanced Control Strategy for Three-Phase PWM Rectifier Based on One Cycle Control. Transactions of China Electrotechnical Society, 2012, 27(11): 183-190.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2012/V27/I11/183

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