基于MATLAB仿真的PSS参数配置方法

电力系统稳定器(PSS)是增加阻尼抑制低频振荡的重要措施。电网运行准则(GB/T 31464—2015)明确规定100 MW及以上的火电、核电及燃气机组的励磁系统应具备PSS功能。PSS试验中需要配置超前滞后环节的时间常数,针对配置参数时存在效率低下及不能最优化的问题,提出了基于MATLAB最优化函数进行参数自动配置的方法,通过设置各个频率点的相位期望值和构建相位方差和的目标函数,实现了在各频率点特定相位要求下的PSS参数自动计算。给出了该方法的详细步骤,最后在某1000 MW的火电机组PSS试验中进行了验证。

Configuration Method for PSS Parameters Based on MATLAB Simulation

Power system stabilizer(PSS)is an important equipment to increase damping and suppress low frequency oscillations of power system.According to the grid operation code(GB/T 31464—2015),the excitation system of thermal-,nuclear-and gas-power generating units(100 MW and above)must have PSS ability.The time constant of lead-lag compensator needs to be configured during PSS test.At present,configuration methods for parameters are inefficient and need to be optimized.In order to solve this problem,automatic configuration method for PSS parameters based on MATLAB simulation is proposed.By setting the expected phase value at each frequency and constructing the objective function with the sum of squares of phase differences,the automatic calculation of PSS parameters under specific phase requirements at each frequency can be realized.The steps of this method are given in detail,and the method is verified on an 1000 MW thermal-power generating unit during the PSS test.