摘要
针对电厂主蒸汽温度对象大延迟、大惯性的特点,设计了模型预测控制系统,通过MATLAB仿真实验,模拟预测控制系统和PID串级控制系统对电厂主蒸汽温度的控制,比较研究两者的控制性能。仿真试验以负荷变化和减温水自发性扰动作为主蒸汽温度干扰因素。仿真结果表明,在负荷或减温水自发性阶跃扰动情况下,MPC控制系统与PID控制系统相比,主蒸汽温度的最大动态偏差较小,调节时间较短,对不同干扰具有更好的适应性。过热器减温水阀的实际响应能力可以满足MPC快速控制的需求。
A model predictive control system was designed according to large delay and inertia characteristics of the main-steam temperature. Simulation models were created by MATLAB to simulate the application of MPC and PID on the control of main-steam temperature for comparing the advantage between MPC and PID. In this simulating, the interferences for main-steam temperature were the unit load changes and spontaneous disturbances of the rate of temperature control water. In the MPC system, the simulating results showed that the maximum dynamic difference of main-steam temperature was less, and the regulating time was shorter comparing with the PID system. The actual response ability of superheater attemperating water valve could meet the fast controlling demand of MPC.
出处
《电站系统工程》
2015年第6期54-56,共3页
Power System Engineering
关键词
主蒸汽温度
PID
预测控制
仿真
main-steam temperature
PID
predictive control
simulation
