摘要
在能源绿色低碳转型过程中,火电机组承担着大量的调峰调频任务来平抑新能源电力规模化并网带来的波动,这给现役亚临界机组汽包水位的稳定控制带来巨大挑战。针对汽包水位这类非自衡过程,提出一种积分时滞型自抗扰控制策略。首先,将被控对象近似成积分加时滞的标称模型,然后,引入控制量时延环节以使扩张状态观测器的两个输入信号相位近似同步,最后,采用双轨迹法求解出积分时滞型自抗扰控制器的控制参数稳定域。仿真算例表明,对比其他几种典型控制算法,所提控制方法在设定值跟踪、抑制干扰以及鲁棒性等方面具有更为优良的性能。进一步,基于某600 MW亚临界燃煤机组进行给水系统的实验结果也表明,在机组稳定工况和大范围变工况两种条件下,积分时滞型自抗扰控制品质满足电力行业标准的指标要求,且相比原始的串级三冲量比例-积分-微分(proportional-integral-derivative,PID)控制策略水位偏差更小,定负荷时偏差≤1.5 mm,变负荷时偏差≤2.1 mm,展现了所提控制策略在机组深度调峰和性能优化等方面的良好应用前景。
In the process of transitioning towards green and low-carbon energy,coal-fired units undertake a large number of peak shaving and frequency regulation tasks to mitigate the fluctuations brought about by the large-scale integration of new energy power into the power grid.This poses significant challenges for the stable control of the drum water level in the in-service subcritical units.An integral time-delayed active disturbance rejection control(ITD-ADRC)strategy is proposed for non-self-regulating process such as drum water level.Firstly,the process is approximated as an integral plus time-delayed nominal model.Then,the delayed link of the manipulated variable is introduced to synchronize the phase of the two input signals of the observer in the extended state.Finally,the stability region of ITD-ADRC parameters is accurately determined using the dual-locus method.Simulation results show that the proposed control method outperforms several other typical control algorithms in terms of set-point tracking,disturbance rejection,and robustness.Furthermore,based on experimental results from the feedwater system of a certain 600 MW subcritical coal-fired unit’s simulator,it has been demonstrated that the proposed ITD-ADRC control strategy meets the quality requirements of power industry standards under both constant-load and load-varying conditions of the unit.Moreover,compared with the original cascade three-element proportional-integral-derivative(PID)strategy,the deviation of drum water level is smaller,with deviations of no more than 1.5 mm at constant load and no more than 2.1 mm at varying load.These results also indicate promising prospects of the proposed control strategy in terms of deep peak shaving and performance optimization for power plants.
作者
孙明
徐文鑫
邹浓茂
赵吉兴
SUN Ming;XU Wenxin;ZOU Nongmao;ZHAO Jixing(Department of Automation,North China Electric Power University,Baoding 071003,Hebei Province,China)
出处
《中国电机工程学报》
北大核心
2025年第17期6874-6885,I0022,共13页
PROCEEDINGS OF THE CHINESE SOCIETY FOR ELECTRICAL ENGINEERING
基金
河北省省级科技计划项目(22567643H)
河北省自然科学基金项目(E2018502111)。
关键词
锅炉汽包水位
非自平衡过程
积分时滞模型
自抗扰控制
稳定域
drum water level of boiler
non-self-regulating process
integral time-delayed model
active disturbance rejection control
stability region
