超临界二氧化碳(S-CO2)布雷顿循环发电是比蒸汽朗肯循环更高效的发电技术。锅炉出口主介质CO2温度是S-CO2燃煤发电机组的关键参数。燃介比仍然是S-CO2燃煤锅炉控制的核心任务，以燃介比的调整为主要调节手段和以低温CO2喷射减温为辅助细调手段的主介质CO2温度控制系统的动态特性可以拟合为一阶惯性加纯滞后(FOPDT)模型。采用分数阶PIλDμ实现主介质温度的控制，基于混合灵敏度函数设计PIλDμ控制器参数以适应机组负荷变化所引起的对象模型参数变化。实例仿真表明，利用分数阶PIλDμ控制器可以获得更好的控制系统闭环特性，具备较强的抗扰性，提高了系统的稳定性和鲁棒性，其控制品质优于常规PID控制以及线性自抗扰控制(LADRC)。

Supercritical carbon dioxide (S-CO2) Brayton cycle power generation is more efficient than steam Rankine cycle.The temperature of main medium CO2 at boiler outlet is the key parameter of supercritical carbon dioxide coalfired power plant.The ratio of boiler fuel to carbon dioxide working medium (fuel medium ratio) is still the core task of supercritical carbon dioxide coalfired boiler control.The fuel medium ratio is the main means to control the temperature of the main medium CO2 at the boiler outlet.Lowtemperature CO2 injection is an auxiliary refinement means to control the temperature of the main medium CO2 at the boiler outlet.The dynamic characteristics of the main medium CO2 temperature control system by means of fuel and lowtemperature CO2 injection desuperheating can be fitted to the firstorder plus deadtime (FOPDT) model.In this paper,fractionalorder PIλDμ is used to control the main medium CO2 temperature.In order to adapt to the changes of plant model parameters caused by generator load changes,PIλDμ controller parameters are designed based on hybrid sensitivity function.The simulation example proves that the fractionalorder PIλDμ controller can improve the closedloop characteristics of the control system，has stronger disturbance rejection performance,and enhance the stability and robustness of the system.The control performance of fractionalorder PIλDμ is better than that of general integerorder PID control and linear active disturbance rejection control (LADRC).

TM621.2

海南热带海洋学院科研项目(RHDRC202004)