DESIGN OF NON-LINEAR H_∞ EXCITATION CONTROLLER

A design of nonlinear H∞excitation controller for single-machine infinite-bus power system is proposed in the paper. Applying direct feed back linearization and directlyassigning virtual control variable, the calculation is simplified. △d, △w, △Pe and the integrated quantity of △Vt is used as state variable to simultaneously improve power system stability and voltage regulation accuracy. The optimization of power function is implemented by H∞control theory and m-synthesis toolbox in Matlab and the design of non-linear robust control is performed. The engineering practicality of the control rule is carried out and is simulated by the Powersys toolbox in Matlab.