多频段PSS结构设计和参数协调

Construction design and parameter coordination of multi-band PSS

为了在提高PSS对振荡模式选择性的同时,改善传统多频段电力系统稳定器(PSS)结构复杂、频段数固定的问题,提出了一种新型的功率输入型多频段PSS,并对PSS的结构进行了频率特性分析。在系统多运行方式下,使用概率灵敏度分析法进行分析,确定PSS的频段个数;进而根据该PSS参数设计方法,利用非线性规划技术对参数进行协调优化。在一8机系统内进行了验证,表明该PSS可以根据具体需要确定补偿频段数,既可作为单频段PSS仅提高某一个模式的阻尼比,也可作为多频段PSS同时兼顾多个振荡模式。

In order to improve the PSS selectivity of oscillation modes,and overcome the shortcomings of conventional multi-band power system stabilizer（MBPSS）that the construction is complex and the number of the compensation bands is fixed,a novel power-input MBPSS is proposed.The frequency characters of the PSS are analyzed.Under multi-operating conditions,probabilistic sensitivity analysis is used to decide the number of the PSS band.According to the PSS parameter design method,parameters are coordinated by using the nonlinear programming technique.In a eight-machine system,it shows that the PSS can determine the compensated band numbers according to specific conditions and can be applied as a single-band PSS to increase only one mode damping ratio,or as a multi-band PSS which improves the damping performance of more than two modes.