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考虑转子励磁控制的双馈风机故障特性分析

Fault Characteristics Analysis of Double-fed Induction Generators Considering Rotor Excitation Control
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摘要 双馈风机大量并网后,电网故障特性发生明显变化,给电网设备选型及电网继电保护问题带来挑战。非严重故障情况下,撬棒保护未达到动作阈值时,转子侧变换器继续投入运行,转子变换器励磁控制很大程度上改变双馈风机的故障特性。通过建立双馈风电机组数学模型,理论分析了转子侧变换器控制下双馈风电机组的磁链变化、转子电流和定子电流的暂态特性。并通过PSCAD/MATLAB仿真软件对DFIG磁链和定转子电流进行了仿真分析,验证了理论分析的正确性。 High penetration of double -fed induction generator (DFIG) will obviously change the fault characteristics of power grid, which brings the challenge to the equipment type selection and relay protection of power grid. For non - severe fault conditions, the crowbar protection does not reach the action threshold and the rotor side keeps operating, and the excitation control of rotor converter will greatly change the fault characteristics of double - fed induction generator. Based on the mathemati- cal model of double - fed wind generating unit, the flux variation and rotor/stator current transient characteristics of double - fed induction generator under the control of rotor side converter are analyzed theoretically. The simulation of DFIG flux and stator/rotor current is carried out by PSCAD/MATLAB simulation software, which verifies the correctness of the theoretical a- nalysis.
出处 《四川电力技术》 2016年第6期10-13,22,共5页 Sichuan Electric Power Technology
基金 中央高校基本科研业务费专项资金资助(SWJTU12CX031)
关键词 双馈感应风力发电机 转子励磁控制 故障电流 double - fed induction generator rotor excitation control fault current
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