PSS2A模型的反调现象分析

Analysis on Antiregulation of PSS2A Model

根据PSS2A的理论模型推导,采用加速功率作为输入信号的电力系统稳定器不出现反调,但实际机组励磁系统中配置的PSS2A模型输入量角速度并不是实际的发电机角速度,而是通过矢量变换和等效计算得到的等效发电机角速度,因此,实际机组的PSS2A模型必然存在一些反调现象。结合广东台山电厂4号机组的无功功率异常波动问题,通过BPA暂态稳定程序进行仿真计算,从理论上解释了机组无功功率异常波动的原因,给出了判断正常电力系统稳定器反调和异常电力系统稳定器反调的方法。

According to deduction of theoretical model of PSS2A,there are no antirequlations in power system stabilizer which adopts acceleration power as input signal;However,angular velocity of input into PSS2A model configured in excitation system of units does not equal to that of generators but that of equivalent generators concluded from vector change and equivalent calculation.Therefore,there must be antiregulations in PSS2A model of actual units.Aiming at reactive power fluctuations of No.4 unit in Taishan power plant,the paper theoretically interprets reasons for reactive power fluctuations of No.4 unit and presents ways to judge normal PSS antiregulations and the contrariety through simulation calculation by BPA transient stability program.