电力系统稳定器相位补偿方式对次同步振荡的影响

摘要

除了输入信号类型之外，电力系统稳定器（PSS）的相位补偿方式也是其影响次同步振荡的非常重要的因素。设计了四种不同类型的PSS：采用一级超前补偿的速度反馈型PSS，采用两级超前补偿的速度反馈型PSS，采用滞后补偿再反相的速度反馈型PSS，采用滞后补偿的功率反馈型PSS；分析了各PSS的频率特性，加入PSS前后系统的电气阻尼特性，PSS相位补偿方式对次同步频段信号的影响，以及滞后补偿再反相的速度反馈型PSS的可行性。结果表明，采用滞后补偿再反相的速度反馈型PSS对次同步振荡几乎没有影响，该PSS既能利用理想的转速偏差作为输入信号，又能避免对轴系扭振敏感，还能有效抑制低频振荡，具有可行性。%In addition to the type of input signal, phase compensation method of power system stabilizer (PSS) is also very important for SSO. Four types of PSS are designed. These PSSs are speed-based PSS with a first-order lead compensation block, speed-based PSS with a second-order lead compensation block, speed-based PSS with a third-order lag compensation and then inverting, and power-based PSS with a lag compensation block. The frequency characteristics of PSS and electrical damping characteristics with or without PSS are analyzed. The impact of phase compensation methods of PSS on subsynchronous signal is also studied. The results show that the speed-based PSS with lag compensation and inverting almost has no effect on SSO. This kind of PSS can use the ideal speed deviation as the input signal, and avoid the torsional sensitivity. It can also suppress the low frequency oscillation effectively. This kind of PSS is feasible.