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双馈风力发电低电压穿越撬棒阻值模糊优化

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Keywords: 撬棒阻值,隶属函数,模糊优化,双馈感应发电机,低电压穿越

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Abstract:

撬棒(crowbar)保护是双馈风力发电机组实现低电压穿越的主要控制方法之一。针对传统撬棒阻值设计与定转子电流约束条件边界取值相关,进而影响系统安全性这一问题,采用模糊优化理论,分析电网发生三相短路故障时转子电流峰值估算式以及撬棒阻值约束式;根据模糊优化机制及上述阻值约束关系,建立撬棒阻值模糊集隶属函数及模糊目标函数。针对1.5MW双馈风电机组撬棒阻值进行模糊优化设计,并对设计结果在Matlab/Simulink平台上进行了仿真验证。仿真结果表明,撬棒阻值优化可以显著减小双馈机组低电压穿越时的定转子电流、直流母线电压及电磁转矩振荡,有效提高风电系统的安全可靠性。

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