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针对单元机组协调控制系统多变量、强耦合、时变、滞后大的特点,提出一种采用串联后补偿单向解耦后加入PID控制器自整定的控制策略。该控制策略首先对系统进行串联后补偿实现完全解耦,并通过单向解耦对解耦系统进行简化,然后把多变量的控制问题转化为多个单变量,再对各个单变量加入PID控制器进行自整定。通过对125MW单元机组协调控制系统的仿真分析可知,这种方法有效消除了输入与输出之间的强耦合带来的不利影响,使系统输出稳定,控制效果好。
Aimed at the characteristics of multi-variable, strong coupling, time-varying and large hysteresis of coordinated control system of unit unit, a control strategy of self-tuning PID controller after adding one-way compensation after series compensation is proposed. The control strategy firstly decouples the compensation of the system in series and then decouples the decoupling system through unidirectional decoupling. Then, the multivariable control problem is transformed into a plurality of univariate variables. PID control is added to each univariate Self-tuning device. Through the simulation analysis of the coordinated control system of 125MW unit, we can see that this method effectively eliminates the adverse effects caused by the strong coupling between input and output, makes the system output stable and the control effect is good.