earticle

영어

In designing control system, it is important to minimize the order of controller since the high order controller is impractical. In this paper we propose a method to obtain the minimum order of bilinear system by using the genetic algorithm. The process of optimization is to minimize the
H2 -norm from the transfer function from input to output which implies suppressing the magnitude peaks of the frequency response. This problem is solved by using the genetic algorithm. To verify the proposed method, the simulation and numerical calculations is carried out on a nonlinear RC circuit and the results show that proposed method can able to approximate a high order bilinear model from 200th order to the 1st order better than the existing method.