应用非线性控制理论抑制电力系统多模振荡的研究

DAMPING OF POWER SYSTEM MULTI-MODE OSCILLATIONS USING NONLINEAR CONTROL THEORY

利用非线性变换和线性系统中的ＩＴＡＥ最佳调节律，设计了一个新型的非线性最优电力系统稳定器（ＮＩＰＳＳ）；基于多机电力系统模型，导得了用本地测量量实现每台机组的解耦控制律。在一个具有多模振荡的多机电力系统上进行了数字仿真，结果表明：所设计的ＮＩＰＳＳ能有效地抑制电力系统多模振荡，有满意的动态响应和很好的鲁棒性；并且，ＮＩＰＳＳ能和其它类型的ＰＳＳ协调运行，共同提高多机系统的阻尼特性。

This paper presents a method to design a new nonlinear ITAE power system stabilizer(NIPSS), using a nonlinear feedback transformation technique and the ITAE rule in the linear system optimal control theory. The design of NIPSS is carried out based on a multi-machine power system model.A decoupled nonlinear control strategy is obtained for individual machines and implemented by purely local variable feedback.Performance of the proposed nonlinear stabilizer in a multi-machine power system With multi-mode oscillations is digitally simulated.The responses of the system with the proposed stabilizer are compared with the conventional PSS(CPSS)and the self-tuning PSS(SPSS)for different disturbances. Simulation results show that the nonlinear ITAE power system stabilizer can provide effective damping for power system multi-mode oscillations,give satisfactory dynamic performance and good robustness.Moreover,it can harmoniously cooperate with different types of PSSs to improve damping performance of multi-machine system。