发电厂厂用电系统中PSS与SVC稳定的离散分析

针对电力系统装置间相互协调运行的问题,对配有电力系统稳定器(PSS)的励磁系统发电机与装有静止无功补偿器(SVC)联合运行的发电厂厂用电系统,分别建立了PSS、SVC和带励磁系统的发电机数学模型并将其离散化,深入研究了PSS与SVC在厂用电系统近距离联合运行中的交互影响问题及提高SVC和PSS运行稳定性的方法。指出了在两者同时运行的情况下SVC控制器的设计需要考虑PSS放大倍数的影响,对SVC的比例、积分系数的改进设计的动态特性仿真表明,可以提高厂用电系统中SVC和PSS联合运行的稳定性。通过大量的仿真实验对离散分析的结果进行了验证。

Discrete analysis of stability for PSS and SVC in electric power plant auxiliary system

For the coordination between devices,the discrete mathematical models of PSS(Power System Stabilizer),SVC(Static Var Compensator) and generator with excitation system are established for the power plant auxiliary system. The interaction between SVC and PSS,which are operating correlatively and closely,is studied and the ways to improve their stability are researched. It is pointed out that the design of SVC controller must consider the influence of the amplification factor of PSS. The simulation of SVC dynamic performance indicates that,the system stability can be enhanced by improving its proportional and integral coefficients. Simulative experiments validate the results of disperse analysis.