基于励磁系统滞后特性的电力系统稳定器参数设计

Parameter design of power system stabilizer based on hysteresis characteristic of excitation system

提出一种基于励磁系统滞后特性的电力系统稳定器参数设计方法,根据发电机的Heffron-Philips模型和电力系统稳定器(PSS)的补偿原理,推导了励磁系统滞后特性与各状态变量之间的关系,通过分析和计算现场实测扰动状态数据,得到PSS应该补偿的大致相角及增益,并在此基础上设计了PSS参数。相比于留数法,文中方法无需知道系统传递函数,方法简单有效,通过对四区两机实验仿真,结果表明该方法能够设计出较合理的参数,可有效抑制电力系统低频振荡。

A design method of power system stabilizer parameter based on hysteresis characteristics of excitation system is proposed. According to Heffron-Philips model of generator and compensation principle of power system stabilizer（PSS）,the relationship between hysteresis characteristic of excitation system and state variables is derived. The gain and phase angle can be analyzed and calculated substantially from the field measurement data,and then design the parameters of the PSS. Compared to the residue method,the proposed method does not need to know the system transfer function in advance,it＇s simple and efficient. The simulation results show that the proposed method is able to design more reasonable parameters,which can effectively restrain the low frequency oscillation of power system.