励磁电流基值及回路压降对放大倍数影响的研究

Study on Impact of Excitation Current Base Value and Loop Voltage Drop on Magnification

某电厂两台同类型发电机组,其励磁方式、励磁调节器型号及其电压控制部分PID参数完全相同,现场试验录波曲线形状及励磁系统性能指标差异却很大,无法进行励磁系统模型参数确认。针对该问题,根据励磁系统建模导则、设备厂家资料及现场试验数据,导出励磁系统放大倍数与励磁电流基值及励磁回路压降的关系,给出励磁电流基准值选取和等效放大倍数计算的方法,程序仿真验证了所述方法的可靠性。

In a certain power plant,two generating units of the same type have the same excitation method,excitation regulator,and PID parameters of the voltage control part,yet the shape of the on-site test wave recording curve and the performance indicators of the excitation system differ significantly,making it impossible to confirm the model parameters of the excitation system.To address this issue,based on the excitation system modeling guideline,manufacturer data and field test data,the relationship between the excitation system magnification and the base value of the excitation current and the voltage drop in the excitation circuit is derived.The method for selecting the excitation current base value and calculating the equivalent magnification is provided,and the reliability of the method is verified through program simulation.