功率方向电力系统稳定器在抽水蓄能同步电机上的应用

Application of Power Directional Power System Stabilizer to Pumped Storage Machine

基于阻尼绕组作用的单机无穷大系统线性化c1～c12 模型 ,分析了常规PSS(电力系统稳定器 )附加电磁阻尼力矩的符号与抽水蓄能同步电机运行工况的关系 ,提出了功率方向PSS的设计思想 ,并对功率方向PSS在抽水蓄能同步电机各种运行方式下的作用进行了研究。功率方向PSS可辨别抽水蓄能电机的发电和抽水工况并相应改变PSS增益的符号。常规PSS在抽水工况下将产生负的电磁阻尼力矩 ,不能直接用于抽水蓄能同步电机 ;抽水蓄能同步电机宜采用可辨别发电和抽水工况的功率方向PSS ;

Based on the linearized c 1～c 12 model of one machine infinite bus system, which considers the effect of damper windings, the relations between the supplementary eleetrie torque directions of conventional PSS and the operationg conditions of pumped storage synchronous machine is analyzed. A design concept of power directional PSS is put forward, its performances under all operating conditions of pumped storage machine are studied. It can identify generating or pumping state of pumped storage machine and change the sign of PSS gain accordingly. It is pointed out that because the negative eleetric damping torque is produced under pumping state, the conventional PSS can not be directly used for pumped storage machine, the power directional PSS should be used in stead.The power directional PSS designed for heavily loaded operating conditions (cos >0)has an excellent adaptability to all operating conditions of pumped storage machine.