基于模糊PID算法的空冷机组背压控制系统

Back Pressure Control System of Air-cooled Unit Based on Fuzzy-PID Algorithm

背压是直接空冷机组中最重要的被控变量之一,背压的高低以及变化情况直接关系到机组的安全稳定运行。为适应现代火力发电机组向大容量、高参数方向的发展趋势,采用传统的PID控制策略难以满足复杂的发电过程控制的需要。针对某电厂300MW机组空冷系统模型,在原有PID控制基础上,通过结合模糊控制的相关理论,提出了一种模糊PID控制方法。在MATLAB软件条件下搭建出背压控制系统并进行仿真模拟。由仿真结果可见,模糊PID控制在缩短调节时间和减小超调量上有显著优势。

Back pressure is one of the most important controlled variables in the direct air cooling unit,and the level of back pressure and the change is directly related to the safe and stable operation of the unit.With the development of modern firepower generator set to large capacity and high parameter,it is difficult to meet the need of complex generation process control by traditional PID control strategy.A fuzzy PID control method is proposed based on the original PID control and the Fuzzy control correlation theory by using the air cooling system model of 300 MW unit in a power plant.A back pressure control system is built under the condition of MATLAB software and simulated.The simulation results show that the fuzzy PID control has obvious advantages in shortening the adjusting time and reducing the overshoot.