论述了采用微机调节器自并励励磁系统的电力系统稳定器（ＰＳＳ） 工业投运试验方法，以及根据实测励磁及ＰＳＳ模型和参数进行的华北电网多机系统小干扰稳定计算。对推荐的ＰＳＳ优化参数进行了各种工况试验，确定了阻尼效果最佳参数，计算表明，这些参数有较强的适应系统工况改变的能力。 This paper discusses the PSS industrial commissioning method using microcomputer regulator and excitation system, as well as the small-signal stability calculation of multi-machine system in North China Power Grid based on measured excitation and PSS model and parameters. Various recommended test conditions of PSS optimization parameters were tested, and the best parameters of damping effect were determined. The calculation shows that these parameters have strong ability to adapt to changes in system conditions.