随着可再生能源接入电网比例的逐步增大,热力发电厂需要应对更加频繁、更大范围的负荷变化,给电厂的高阶大惯性过热汽温过程的控制带来严峻的挑战.为此,文中针对一类高阶大惯性过热汽温过程,提出一种基于相位补偿的自抗扰控制(phase compensation based active disturbance rejection control,PC-ADRC)方法.首先,阐述过热汽温系统的工作原理和控制难点.然后,采用低频近似法详细推导相位补偿(phase compensation,PC)网络模型,提出采用PC网络对模型动态特性进行补偿,得到等效降阶模型的简化思路.为便于工程应用,给出PC-ADRC系统的简单实现方法和等效模型分析.最后,对PC-ADRC系统的稳定性和鲁棒性进行研究.理论分析和仿真结果表明,所提出的PC-ADRC系统能有效提升高阶过程控制系统的鲁棒性和快速响应能力.
Abstract
With the continuous penetration of renewable energies,thermal power plants are facing more frequent and wider variable load operation.The control of high order,large inertia superheated steam temperature processes in power plants is facing a great challenge.Therefore,a phase compensation based active disturbance rejection control(PC-ADRC)strategy for a class of high-order,large-inertia processes is proposed.Firstly,the working principles and control problems of SST system are illustrated.Then,the phase compensation(PC)network model is derived carefully by low-frequency approximation.A model simplification method is presented,in which the PC is adopted to compensate process dynamics and obtain reduced-order plant equivalently.To facilitate engineering applications,its simple implementation and equivalent model analysis for the PC-ADRC system are also given.At last,the stability and robustness of the PC-ADRC control system are theoretically studied.Theoretical analysis and simulation results show that the proposed controller can effectively improve the robustness and fast response ability of the high-order process control system.
关键词
过热汽温/火力发电/基于相位补偿的自抗扰控制(PC-ADRC)/高阶过程/低频近似/鲁棒性
Key words
superheated steam temperature/thermal power generation/phase compensation based active disturbance rejection control(PC-ADRC)/high order process/low-frequency approximation/robustness
维普
万方数据