针对火电厂循环水加酸控制系统存在控制系统对象难以建立、非线性和时变的特性，采用了改进的粒子群优化

算法优化PID参数，使得控制器可在不同环境温度下采用不同的PID参数．实际运行结果表明，该系统能够克服环境温

度带来的干扰，使循环水pH值被控制在给定值范围内．-Water plus acid control system for thermal power plant control system exists object is difficult to establish, nonlinear and time-varying characteristics, using the improved particle swarm optimization algorithm to optimize PID parameters, so that the controller can be different in different ambient temperatures. PID parameters. Actual operating results show that the system is able to overcome the interference caused by the ambient temperature, the circulating water pH value is controlled within a given range of values.