火电机组灵活运行柔性预测控制  

Seamless Predictive Control for Flexible Operation of Thermal Power Unit

作　　者：吴佳璐 刘鑫屏[1] WU Jialu;LIU Xinping(School of Control and Computer Engineering,North China Electric Power University,Baoding 071003,China)

机构地区：[1]华北电力大学控制与计算机工程学院,河北保定071003

出　　处：《华北电力大学学报（自然科学版）》2024年第6期114-121,共8页Journal of North China Electric Power University：Natural Science Edition

基　　金：国家重点研发计划项目(2017YFB0902102).

摘　　要：火电机组灵活调峰运行及燃料性质变化会导致被控对象出现时变非线性,等效模型相当于在原模型基础上叠加一个时变的动态环节,此环节在不同工况下呈现惯性、纯迟延或非最小相位特性,传统PID控制难以适应此类时变非线性。研究一种柔性多模型预测控制方案,分别建立典型工况下复现对象惯性、纯迟延、非最小相位特性变化的动态模型,依据负荷、煤质等参数变化使控制系统在不同模型及其对应的控制器之间作柔性切换。仿真实验证明该方法能够适应对象特性强烈变化,在大范围内保证控制系统的稳定性并具有优良的控制品质。将此控制方案应用到一台循环流化床机组协调控制系统中,整体控制效果令人满意。Flexible peak regulation operation and fuel property change of thermal power unit will lead to time-varying nonlinearity of the controlled object,and the equivalent model is equivalent to superimposing a time-varying dynamic element on the original model.This link has the characteristics of inertia,time delay or non-minimum phase under different working conditions,and the traditional PID control is difficult to adapt to this kind of time-varying nonlinearity.In this paper,we proposed a flexible multi-model predictive control scheme,and established the dynamic models of inertia,time delay and non-minimum phase characteristics of the object under typical changed conditions.According to the changes of power load and coal quality,the control system can flexibly transfer between different models and their corresponding controllers.The simulation results show that this method can adapt to the strong change of object characteristics and ensure the stability of the control system in a large range with excellent control quality.The control scheme is applied to the coordinated control system of a circulating fluidized bed unit,and the overall control effect is satisfactory.

关 键 词：多模型预测控制 柔性切换 非线性 纯迟延 非最小相位 

分 类 号：TM621[电气工程—电力系统及自动化]