Smith-Fuzzy-PID在集中供热控制系统中的应用研究

Applications Study of Smith-Fuzzy-PID in Central Heating System

摘要:

供热过程存在的大惯性,时变性,滞后性等特性,严重影响了供热过程的控制性能；为了解决上述问题,针对二次网进行了基于温度的流量调节；并且分别针对滞后特性在PID的基础上加入了Smith算法,针对时变特性又在Smith和PID基础上加入模糊控制,分别就所建模型和由于扰动等外界因素造成的系统参数变化后的模型设计了Smith-Fuzzy-PID控制器并进行了仿真研究；仿真结果表明,Smith-Fuzzy-PID在模型精确和外界扰动两种情况下均能达到很好的控制效果,方法可行有效。

Abstract:

The big inertia, time-varying delay, hysteresis characteristics of the heating process seriously affect the control performance. In order to solve the above problems design the flow adjustment based on temperature for the secondary network. And respectively for hysteresis characteristic join the Smith algorithm on the basis of the PID algorithm, and in view of time-varying delay characteristic join fuzzy control on the basis of Smith and PID control. Separately on the model we set up and the changed model due to external factors such as the disturbance designs a Smith-Fuzzy-PID controller and simulates the control effects. The simulation results show that Smith-Fuzzy-PID algorithm on the original model and changed model can achieve good control effect. And the method is feasible and effective.