基于模糊内模控制的汽轮机调速系统研究

Research on Steam Turbine Governing System Based on Fuzzy Internal Model Control

针对汽轮机DEH控制系统中存在时滞、死区、干扰等非线性环节,提出一种模糊内模控制策略。基于粒子群算法对广义被控对象进行模型简化处理,利用内模控制原理将其设计为内模-PID,根据最大灵敏度函数与τc之间的关系进行参数初始选取,并用模糊控制器对仅有的一个参数进行在线整定。通过建模仿真并对比分析:该方法有效避免了参数盲目选取问题,提高了系统响应速度、减少超调量、具有较强的抗干扰性,明显改善了汽轮机调速系统控制品质,对汽轮机调速系统设计提供了参考。

A fuzzy internal model control strategy is proposed for the nonlinear time delay,dead zone and disturbance in the DEH control system of steam turbine. First the generalized controlled object is approximated as a first-order inertial overtime system by using the particle swarm optimization. Then the internal model controller（ IMC） designed has only one adjustable,which is on-line adjusted by fuzzy controller. Through simulation and comparative analysis： this method has quick response speed,small overshoot,good anti-disturbance performance,the static and dynamic characteristics of the system are improved,the control quality of steam turbine governing system is improved obviously,which has a certain reference value for the design of steam turbine governing system.