阀门执行机构的PLC闭环控制方法

The PLC Closed-loop Control Method for the Valve Actuator

为了有效避免响应死区控制回路产生振动的现象,提出一种考虑响应死区的阀门执行机构PLC闭环控制方法。分析阀门执行机构的工作原理,在响应死区条件下,构建动态数学模型,通过分析调节阀门和压力之间的关系得到传递函数。同时通过将模糊滑模控制和PID控制有效集合,构建一种增量式模糊控制器,引入改进遗传算法获取智能优化控制策略,最终实现阀门执行机构PLC闭环控制。实验测试表明,所提方法具有较好的控制性能,能够对系统的超调性及时处理,并且相应的阀门开度高于20%,可以有效满足阀门执行机构PLC工作需求。

In order to effectively avoid the phenomenon of vibration in the response dead zone control loop,a PLC closed-loop control method for valve actuators considering the response dead zone is proposed.The working principle of the valve actuator is analyzed,and the dynamic mathematical model is constructed under the condition of the response dead zone,and the transfer function is obtained by analyzing the relationship between the regulating valve and the pressure.At the same time,an incremental fuzzy controller is constructed by effectively integrating the fuzzy synovial control and PID control,and the improved genetic algorithm is introduced to obtain the intelligent optimal control strategy,and finally the PLC closed-loop control of the valve actuator is realized.The experimental test shows that the proposed method can have good control performance,deal with the overshoot of the system in time,and the corresponding valve opening is higher than 20%,which can effectively meet the working requirements of PLC of valve actuator.