热力过程非线性PI控制器参数优化和性能分析

Parameter optimization and performance analysis of nonlinear PI controllers of thermal process

在热力过程控制系统中,通过选择合适的非线性P I控制器,能使系统的动态性能得到显著改善。利用S im u link工具箱中的非线性设计模块(NCD模块)对4种P I控制器的参数进行优化,并基于M on te-C arlo实验原理计算和分析不同控制系统的性能鲁棒性。仿真结果表明:所选的4种控制器中,其中一种非线性P I控制器对4类典型热力过程控制系统的动态性能均有显著改善,系统输出几乎没有超调,调节时间明显缩短,过渡过程更加平稳,并且该控制器对被控对象参数变化有较好的性能鲁棒性。

The dynamic performance of thermal process control system can be improvcd significantly through selecting appropriate nonlinear PI controllers. The parameters of four kinds of nonlinear PI controllers were optimized using nonlinear control design （NCD） module in Simulink tnolbox. Based on Monte Carlo experiment principle, the robust performance of different systems was evaluated and analyzed. Simulation results indicate that one of the selected four kinds of nonlinear PI controllers improves the dynamic performance for four kinds of typical thermal process control systems obviously with short settling time, small overshoot, smooth transitional process and robustness against parameter perturbation.