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电网技术  2006 

励磁系统及电力系统稳定器对发电机组次同步谐振阻尼特性的影响

, PP. 14-19

Keywords: 励磁系统,电力系统稳定器,次同步谐振,测试信号法,时域仿真,PSCAD/EMTDC

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Abstract:

采用时域仿真实现的复转矩系数法,测试信号法,以IEEEAC1A型、AC2A型以及ST1A型3种标准的励磁系统和IEEE单通道的电力系统稳定器(powersystemstabilizer,PSS)为研究对象,分析了它们对发电机组次同步谐振阻尼特性的影响。通过频率扫描计算发电机组在次同步频率下的电气阻尼特性曲线,从而对各种励磁系统在无PSS以及装设不同输入信号的PSS情况下对电气阻尼特性的影响进行了分析;并分析了PSS参数对电气阻尼特性的影响。分析结果表明,高起始响应励磁系统在与以发电机输出电磁功率作为输入信号的PSS配合使用时,能够减小谐振点附近的电气负阻尼,使得其在抑制低频振荡的同时,还有利于缓解次同步谐振。

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