Abstract
The character of PID controllers is simple is simple structure, good adaptability and great robustness,especially they don’t depend on the precise model of the objects.They can also solve the difficulty of precsise modeling in industrial process.Since they are used for a long time , the control engineers have already accumulated a great deal of tuning experience of PID controllers’parameters.But the simple PID controllers can’t get the satisfied degree,especially for the time-varying objects and non-linear systems , the traditional PID controllers can do nothing for them.
GA is a global optimization algorithms with high robustperformance. It has been widely applied in automatic controlfield. PID optimization based on GA realizes the multi. Form the simulation result,we can see GA is a good methodto select PID factors, and has its theoreticism and actuality
Key words: PID;Genetic algorithms; PID optimal-tuning;MATLAB simulate