基于约束最优模型预测抗干扰的槽式太阳能集热场出口温度控制方法研究  

Constrained Optimal Model Predictive and Disturbance Rejection Control Method for Outlet Temperature Control of Parabolic Trough Solar Fields

作　　者：高宪花 魏赏赏 苏志刚[3] GAO Xianhua;WEI Shangshang;SU Zhigang(School of Information and Communication Engineering,Nanjing Institute of Technology,Nanjing 211167,Jiangsu Province,China;College of Energy and Electricity Engineering,Hohai University,Nanjing 211100,Jiangsu Province,China;School of Energy and Environment,Southeast University,Nanjing 210096,Jiangsu Province,China)

机构地区：[1]南京工程学院信息与通信工程学院,江苏省南京市211167 [2]河海大学能源与电气学院,江苏省南京市211100 [3]东南大学能源与环境学院,江苏省南京市210096

出　　处：《中国电机工程学报》2024年第20期8178-8188,I0022,共12页PROCEEDINGS OF THE CHINESE SOCIETY FOR ELECTRICAL ENGINEERING

摘　　要：槽式太阳能集热场出口温度的控制对槽式太阳能发电系统的安全性和经济性至关重要。通常,集热场出口温度要求维持在设定值附近或跟踪设定值变化,但是集热场中存在的变量约束和多源扰动增加了该控制目标实现的难度。为此,该文提出一种约束最优模型预测抗干扰控制方法,首先通过模型转化将多源扰动重构为单一集总扰动并设计扩张状态观测器估计该集总扰动,进而提出一种稳态目标值动态优化方法以兼顾变量约束、抗干扰和设定值跟踪等多重控制性能,并提出一种带扰动补偿的最大受控容许集构造方法将无穷数量约束转换为有限数量约束,采用双模态控制策略求解等效二次规划型约束优化问题。最后,仿真结果表明,与对比控制方法相比,该方法虽然牺牲了一定运行速度,但能在控制作用及其增量满足约束进而保证系统安全性的前提下,以较小的超调量和动态偏差实现对复杂光照强度变动、集热场入口温度波动、导热油流量波动以及参数摄动等扰动的有效抑制和设定值跟踪的控制目标。该方法可用于解决包括槽式太阳能集热场在内的一类热工对象变量受限下的多源扰动抑制和设定值跟踪问题。The control of outlet temperature of parabolic trough solar fields is crucial to the safety and economy of parabolic trough concentrating solar power plants.In general,the outlet temperature is required to be maintained near the setpoint or to track setpoint changes.But the existence of variable constraints and multiple field disturbances increases the difficulty of achieving this control goal.To address this issue,this paper proposes a constrained optimal model predictive and disturbance rejection control method,where the field disturbances are first reconstructed into a single lumped one through model transformation and an extended state observer is designed to estimate the lumped disturbance.Based on this,a dynamic optimization method of steady-state target value is proposed to compromise constraints satisfying,disturbance rejection,and set-point tracking.Then a maximum controlled admissible set with disturbance compensation is constructed to convert infinite constraints into finite number constraints,and an equivalent quadratic programming constrained optimization problem is solved by using dual-mode control strategy.Finally,the simulation results show that the proposed method can effectively compensate the adverse influence of field disturbances(like direct normal irradiation,field inlet temperature,heat transfer fluid flowrate and field parameters perturbations)and track given references under the premise that the control variable and its rate of change meet the constraints but sacrificing operating speed compared with the other two controllers.The proposed method can be used to solve the problems of multiple disturbance rejection,setpoint tracking and limited variables of a class of thermal objects,including the parabolic trough solar fields.

关 键 词：模型预测控制 约束抗干扰控制 扩张状态观测器 双模态控制 槽式太阳能集热场 

分 类 号：TK39[动力工程及工程热物理—热能工程]