自抗扰控制技术在火力发电厂中的应用

Application of Active Disturbance Rejection Control Technology in Thermal Power Plant

在火力发电厂中,以常规比例–积分–微分(proportion integration differentiation,PID)为主的控制策略对大惯性、大迟延、多扰动回路的控制效果难以同时满足抗扰性和鲁棒性的要求。针对自抗扰控制(active disturbance rejection control,ADRC)技术的抗扰性强、跟踪快速无超调特点,研究其工程化实现方法和参数整定原则,并将其应用于某1 000 MW超超临界火电机组低压加热器水位控制回路和某300 MW亚临界火电机组磨煤机出口风温控制回路。结果表明:采用ADRC技术控制后,闭环系统的抗扰特性要明显优于原来的PID控制,同时也证明了所提的一阶ADRC参数整定方法的有效性。

In thermal power plants, the control strategy mainly based on conventional proportion integration differentiation （PID） can notsimultaneously satisfy requirements for disturbance rejection and robustness for controlling on great inertia, large time-delay and multi-disturbance loops. On the basis of characteristics of active disturbance rejection control （ADRC） technology including strong disturbance rejection and rapid tracking, this paper studies its engineering realization method and parameter setting principle, and applies it in water level control loop of low pressure heater of one 1 000 MW ultra supercrit- ical thermal power generating unit and control loop for coal mill exit wind temperature of one 300 MW subcritical thermal power generating unit. Results indicate that after adopting ADRC technology, disturbance rejection of the closed-loop sys- tem is obviously superior to the original P1D control. It also proves validity of the proposed setting method for first-order ADRC parameters.