STRUCTURED GENETIC ALGORITHM FOR ROBUST H-INFINITY CONTROL-SYSTEMS DESIGN

A structured genetic algorithm (SGA) approach is developed for robust controller design based on the concept of an H-infinity loop-shaping t echnique and the method of inequalities, Such an SGA is capable of sim ultaneously searching the orders and coefficients of the precompensato r and postcompensator for the weighted plant, It is, therefore, not ne cessary to predefine the order of compensators as in usual practice, A multiple objective ranking approach is also incorporated so that the design criteria of extreme plants can be easily achieved. The effectiv eness of such a technique is illustrated by a high-purity distillation column design example.