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电网电压对称跌落下的双馈感应发电机PI-R控制及改进

, PP. 106-116

Keywords: 双馈感应发电机,低电压穿越,比例积分谐振控制,定子磁链衰减,转子侧变流器

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Abstract:

针对双馈感应发电机组转子侧变流器,提出一种基于比例积分谐振(PI?resonant,PI-R)调节器的磁链有源衰减改进控制算法。对电网电压三相对称跌落故障下的定子磁链和转子过压暂态响应进行分析,通过改进转子电流控制加快定子暂态磁链衰减并消除磁链振荡,降低转子过压和过流。与常规PI调节器相比,PI-R能同时对基波直流指令和谐振频率处交流指令实现无静差响应,提高系统对电网电压跌落的抗扰性,保证改进算法的控制精度。该文给出了磁链有源衰减中暂态转子电流的计算方法和PI-R参数设计原则,仿真和实验结果验证了理论分析的正确性和改进算法的有效性。

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