PID控制系统的二次参数优化

Two-step optimizing method for parameters of PID control system

针对PID控制系统固有的单自由度控制方式的弊病,讨论了其参数优化模式之间矛盾产生的机理,并结合水轮机调节系统参数寻优的仿真试验,提出了首先通过给定值跟随优化模式确定KP参数,再通过扰动抑制优化模式确定KI、KD参数的二次参数寻优法.仿真结果证明该方法可以很好地缓解控制系统稳定性与抗负荷扰动能力的矛盾,对于兼顾给定值跟随和扰动抑制这两个控制目标,是可行和有效的.

Aiming at the characteristics of hydraulic turbine regulating system,starting from the computer simulation point of view,the necessity,reliability and concrete methods of hydro-governor parameter optimization under different operating conditions are discussed;of which,it mainly conducts in depth research on the single unit operating conditions which has practical simulation significance.By analyzing the mechanism of contradiction between PID control system optimization modes,The authors put forward a twostep-optimizing method that determines KPparameter first through the set-value follow oriented optimization mode,then determines KIand KDparameters through disturbance abatement oriented optimization mode.Simulation results indicate that this method can effectively relieve the contradiction between the stability and anti load disturbance capacity under this operating condition;and it is feasible and significant.