进化算法的PID参数最优设计

Optimal Design of PID Parameters by Evolution Algorithm

提出用进化算法最优设计PID参数的方法 ,获得最优设计结果 .分析控制系统常用性能指标作为进化评价函数的不足 ,构建控制系统新的评价函数 .为使优化模型简化 ,设计参数采用实数编码及归一化处理 ,进化算法使用新型的 ,以基因为单位进化的遗传算法 .数值实验表明 ,设计结果得到显著改善 .

For optimally designing parameters of PID, the authors suggest to use the method of evolution algorithm. The shortage of using performance indices as evaluation function of control system is analysed; and a new type evaluation function is established for the control system so as to get results of optimal design. The design parameters are encoded in real number and are further normalized so as to simplify the optimization model. A new type genetic algorithm with gene as evolutionary unit is used to replace the conventional one. Numerical experiment shows that the results of design are improved significantly.