多机电力系统间接自适应模糊分散H_∞控制研究

Indirect,adaptive,fuzzy and distributed H_∞ control for multi-machine power system

针对多机电力系统励磁控制模型,考虑到系统的多变量、强耦合非线性等特性,提出了基于模糊逼近的间接自适应模糊分散H∞跟踪控制方案。该方案通过构建模糊自适应系统来逼近未知函数,然后设计H∞补偿器来抵消外部扰动和模糊逼近误差,从而实现了对多机电力系统的稳定性控制并且具有H∞性能。仿真结果表明,当多机电力系统发生三相可恢复故障和三相不可恢复故障时,发电机的转子运行角趋于某一固定值,相对转速和跟踪误差都趋于零。所提方案与电力系统稳定器(PSS)方案对比可知,PSS方案虽然能使系统稳定,但是其超调量大、过渡时间长,而所提方案不仅可以使系统在故障之后迅速稳定,而且超调量更小。

Based on the multi-machine excitation control model and the multi-variable,strong-coupling and nonlinear system characteristics,an indirect,adaptive,fuzzy and distributed H ∞ tracking control scheme is proposed based on the fuzzy approximating,which constructs the fuzzy adaptive system to approximate the unknown function and designs the H ∞ compensator to eliminate the external disturbance and the error of fuzzy approximating.The stable control of multi-machine power system is thus realized with H ∞ property.Simulative results show that,the operational angle of generator rotor tends to a stable value and both the relative angular velocity and the tracking error tend to zero when three-phase recoverable or unrecoverable faults occurs in multi-machine power system.Compared with PSS scheme,the proposed scheme has shorter settling time and smaller overshoot.