Line current harmonic elimination and voltage control of PWM AC/DC converter using a hybrid genetic algorithm

This article presents a novel method for line current harmonic elimination and output voltage control of a PWM AC/DC converter using the principle of hybridization of genetic algorithm (GA) with conventional optimization method. The conventional method selected is the well-known Rosenbrock's (RB) rotating coordinates method. The dual objective of line current harmonic elimination together with output voltage stabilization is redrafted as an optimization task and the switching instances of the PWM converter are then identified using the proposed method. It is observed that while GA offers a near optimal solution to the problem, the method of RB always results in global optima, provided initial values are chosen judiciously. Hence, it is proposed to combine these two methods to gain the advantages of both methods. In such a hybrid optimization method, the task of global search is carried out by GA, while Rosenbrock's method is devoted to local search. Theoretical results are presented and are validated through experimental values. It is shown that fusion of GA with conventional method yields better results.