Based on the vector control system of asynchronous motor

mathematic model of optimal design was provided.An improved genetic algorithm(GA) was adopted to implement the optimization of parameters of PID

which satisfied the design requirement by using Matlab software.Some key problems on GA were discussed

such as an improved binary encoding method

calculation of fitness based on penalty function

construction of genetic operators

and the criteria for heredity termination

etc.The vector control system of optimization PID parameters based on genetic algorithms optimization was proposed for speed control of the asynchronous motor.The simulation result showed that the overshoot of asynchronous motor decreased by 16.7% percent by using the PID parameters of GA optimization.It verified the feasibility and superiority of genetic algorithm in parameters optimization.