基于大滞后控制技术的1000MW超超临界机组过热及再热汽温优化控制

Control Technology of Overheating and Reheat Steam Temperature Optimization Control Based on the Large Time Delay in 1000MW Ultra-Supercritical Units

国产1000MW超超临界机组过热及再热汽温控制大部分采用负荷前馈+PID的传统控制策略,对于大滞后大惯性的控制对象,调节品质不佳,加上大部分电厂煤质变化快和经常断煤的情况时有发生,造成主蒸汽温度、主蒸汽压力、燃料量、给水量等主要参数频繁波动,时常出现锅炉超温现象。平顶山发电分公司在原有控制系统基础上引进大滞后控制技术,采用自适应Smith特性补偿、相位补偿控制、状态变量技术广义预测控制、基于模糊控制理论的智能前馈技术等先进的控制策略,使调节品质大幅度提高,将困扰运行人员的再热烟气挡板自动成功投入,减少了再热器减温水量,一定程度上提高机组安全性和经济性。

Aiming at the overheating of the domestic 1000MW ultra supercritical units and reheat steam temperature control most of the traditional load feedforward ＋ PID control strategy for large lag the large inertia of the control object, it has poor quality adjustment, plus most of the power plant coalchanges quickly and often broken coal, it is often happened, resulting in the main steam temperature, the frequent fluctuations of the main parameters of the main steam pressure, the amount of fuel, to water, and causes boiler over-temperature phenomena. The Pingdingshan Generation Branch in the original control system based on the introduction of large time delay control technology, the use of adaptive Smith feature compensation, and phase compensation control, the state variable technique generalized predictive control, based on feedforward fuzzy control theory of intelligent technology and other advanced control strategies, so that regulation quality is greatly improved. The reheat flue gas damper is put into automatically which the operating person is troubled. It reduces the reheater temperature of water to some extent so improves safety, and economy.