基于自抗扰控制器的主蒸汽温度控制仿真研究

摘要

The main steam temperature control object of the supercritical thermal power units with many fea-tures, such as the large lag, strong inertia and strong nonlinear, which is difficult to control as a thermal object. Owing to these characteristics, this paper, by using the guiding before temperature as an auxiliary feedback signal, applies the active disturbance rejection controller (ADRC) in the main circuit, and the PID controller in the secondary circuit, which the two circuits make up the main steam temperature cascade control system based on ADRC-PID. The system is tested on the platform of Simulink in Matlab based on the model of 600WM supercritical thermal power units. The results show that:compared with PID-PID control strategy, ADRC control strategy has a better control of accuracy and quality, especially in the disturbance rejection and the robustness of the system.%超临界火电机组中主汽温度控制系统对象具有大迟延、大惯性以及强非线性等特点，属于较难控制的一类热工对象。针对这些特性，本文以导前汽温作为辅助反馈信号，主回路采用自抗扰控制器（ADRC），副回路采用PID控制器，主副回路构成ADRC-PID主汽温串级控制系统，以600MW超临界机组模型在matlab中Simulink仿真平台下进行试验研究。结果表明，ADRC-PID控制策略与PID-PID控制策略相比具有更高的控制精度和更好的控制品质，尤其体现在系统的抗扰动能力和鲁棒性。