Optimization control of pulverized coal mill outlet air temperature based on anti disturbance Smith predictive compensation
Towards the goals of carbon peaking and carbon neutrality,as a thermal power unit with high energy consumption and high emis-sion,its combustion performance directly affects the power generation efficiency and carbon emission.Optimal control of boiler combustion is important for operation optimization and flexible peak shifting.The outlet air powder temperature control of the coal mill in a power sta-tion boiler is subject to significant delays and multiple disturbances,which have a profound impact on the safety and stable operation of thermal power units.This paper proposed a feedback link in the compensation loop based on the Smith prognostic controller to enhance the anti-interference capabilities and performance of the air powder temperature control of the coal mill.The first-order inertia pure hystere-sis model was obtained by Taylor series expansion and the method of coefficients to be determined to obtain the model approximation con-version parameters.The anti-disturbance Smith prediction compensation controller was then designed.A comparison with the single-loop PID control experiment reveals that the Smith prediction compensation control algorithm can effectively compensate for the pure delay lag link of the control object.The overshoot of the unit step response is reduced by 36.5％and regulation time is reduced by 65.8％.In com-parison to the classical Smith prediction compensation control algorithm,the anti-disturbance Smith prediction compensation control algo-rithm demonstrates enhanced anti-disturbance performance and notable improvements in the dynamic characteristics of the control object.The overshoot of the unit step response is reduced by 44.7％,and the regulation time is shortened by 15.7％.At the same time,a reduction in the maximum deviation of the perturbation and the convergence time is achieved.The method of this paper was applied to a 660 MW su-percritical primary reheat thermal power unit to realize the smooth tracking of the actual value of the air powder temperature at the outlet of the coal mill to the set value.The effectiveness of this paper's method was further verified.
anti disturbanceSmith estimation compensationcontrolmodel transformationnonlinear programming
万方数据
维普
