燃煤直流炉机组适应不同AGC模式的核心控制策略  

Core Control Strategy of Ultra-supercritical Once-through Boiler Burning Lignite Adapted to Different AGC Control Modes

作　　者：卫琛光 邢智炜[2] 岳涛 尤默 秦天牧 刘磊[2] WEI Chen-guang;XING Zhi-wei;YUE Tao(Beijing Huaketonghe Technology Co.,Ltd;North China Electric Power Research Institute Co.,Ltd.)

机构地区：[1]北京华科同和科技有限公司 [2]华北电力科学研究院有限责任公司

出　　处：《电站系统工程》2022年第6期57-60,共4页Power System Engineering

摘　　要：燃用褐煤的直流炉机组,为适应电网AGC对负荷调节的要求,对其协调控制策略进行改进,从汽温和汽压控制两方面进行了优化。采用同时利用给水和给煤量对中间点温度修正的策略,并通过减温水对给水流量进行修正,实现中间点的稳定控制;利用汽机主控的变参数控制、快速加煤起压回路、一次风压前馈调节等逻辑设计,改善了主汽压力的延迟,缩短了变负荷时压力的启动时间。在机组投入AGC控制后,针对BLO和BLR两种模式不同的变负荷特点,对协调各子系统的前馈量设计了动态变参数修正。根据负荷变动量动态调整修正系数,减小对主汽压力、主汽温度、炉膛压力等重要参数的扰动。控制策略在电厂中的应用结果表明,经过优化后的控制逻辑,能够满足燃烧褐煤机组在不同AGC模式的负荷调节要求,过程中汽温和汽压的控制效果良好。In order to meet AGC requirements of load change, the coordinated control strategy of the once-through boiler burning lignite was optimized. The control strategy was optimized from the aspects of steam temperature control and steam pressure control. The strategy of using feed water and coal to correct mid-temperature at the same time was adopted, and the feed water flow was revised by desuperheating water. Different measures were taken including variable parameter control of turbine, rapid coal adding to improve the main steam pressure, and feed-forward adjustment of primary air pressure were taken to improve the delay of main steam pressure, and shortens the starting time of pressure when changing load. When the unit was put into AGC control, according to the variable load characteristics of two modes of BLO and BLR, the variable parameters of coordinated feedforward of each subsystem were modified. And it is necessary to dynamically adjust the correction factor according to the load fluctuation, in order to reduce disturbance of important parameters such as main steam pressure, main steam temperature, furnace pressure, etc. The application results of control strategy in power plant show that the control logic optimization can meet the load regulation requirements of different AGC modes for lignite burning unit, and steam temperature and pressure control effect is good in the process.

关 键 词：AGC 协调控制 直流炉机组 褐煤 控制策略 

分 类 号：TK323[动力工程及工程热物理—热能工程]