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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

, PP. 183-190

Keywords: 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

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Abstract:

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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