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并联型三相PWM变换器环流无差拍控制策略

, PP. 31-37

Keywords: 三相PWM变换器,模块并联,环流无差拍控制

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Abstract:

三相PWM变换器并联能够有效增加系统容量,但同时可能带来环流问题。环流会使交流电流发生畸变,增加损耗,降低系统效率。该文提出一种新型的环流无差拍控制方法。在分析并联系统环流模型的基础上,设计了环流无差拍控制器,环流控制通过对各并联模块控制环节中空间矢量脉宽调制(spacevectorpulsewidthmodulation,SVPWM)的零矢量进行调节来实现。该方法不需要增加额外的硬件,具有动态响应快,环流抑制效果好等优点,适用于采用通讯线连接的共直流母线交流侧直接并联的三相PWM变换器系统。实验结果验证了理论分析的正确性,表明该方法适用于并网电抗器不同及模块电流给定值不同的并联运行场合。

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