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全周期自适应及针对参数不一致的并联下垂法控制策略

, PP. 50-57

Keywords: 城市轨道交通,辅助逆变器,谐振控制器,下垂法,并联

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Abstract:

辅助逆变器并联是今后列车辅助逆变器发展趋势之一。对于辅助逆变器而言,有功下垂幅值,无功下垂频率相比传统的下垂法更有优势。但是这种下垂法也存在动态响应慢、下垂系数受限等缺点。为了解决这些缺点,提出一种全周期自适应的改进下垂法,结合无需大延迟低通滤波器的新功率计算方法,能极大提升并联逆变器的动态响应。另外,还提出一种结合输出阻抗压降和锁相环两种补偿方法的综合补偿策略,能有效解决并联逆变器参数不一致时提高下垂系数后的电压跌落问题。最后通过仿真和实验充分验证上述理论的有效性。

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