针对火电机组燃烧系统耦合性强、工况复杂、强扰动和参数调节困难的问题，在现有线性自抗扰控制(LADRC)基础上，提出一种改进线性自抗扰控制(ILADRC)。首先，根据热工系统大时滞、大惯性的特点，在LADRC线性扩张状态观测器(LESO)控制输入端串联惯性时滞前馈补偿器，实现LESO前馈和反馈信号同步，提升信号跟随和扰动抑制性能；然后，通过开环频域稳定性分析得出系统稳定性指标和控制器参数关系，进而推导出基于系统稳定性指标的定量化参数整定规则，简化参数调节过程。将所设计的ILADRC应用于火电机组床温和主蒸汽压力耦合控制仿真系统，并与比例积分微分(PID)控制、LADRC、模型辅助线性自抗扰控制(MLADRC)进行对比。结果表明：提出的ILADRC在定值跟随、扰动抑制方面具有明显优势，蒙特卡洛试验进一步证明了所提出ILADRC的鲁棒性优势。

Aiming at the problems of strong coupling, complex working conditions, strong disturbance and difficult parameter adjustment in the combustion system of thermal power units, an improved linear active disturbance rejection control (ILADRC) was proposed based on the existing linear active disturbance rejection control (LADRC). Firstly, according to the characteristics of large time delay and large inertia in thermal power system, an inertial time delay feedforward compensator was connected in series at the control input of the linear extended state observer (LESO) of LADRC, so as to realize the synchronization of LESO feedforward and feedback signals, and improve signal followup and disturbance suppression performance; then, through the openloop frequency domain stability analysis, the relationship between system stability index and controller parameters was obtained, so that the quantitative parameter setting rules based on system stability index were deduced to simplify the parameter adjustment process. The designed ILADRC was applied to the simulation system of coupling control of bed temperature and main steam pressure of thermal power unit, and compared with proportional integral differential (PID) controller, LADRC and MLADRC. The simulation results show that the proposed ILADRC has obvious advantages in setting value followup and disturbance suppression, and the Monte Carlo test further proves the robustness advantage of the proposed ILADRC.

TP273