摘要
浙江北仑发电厂2号机组的主汽温控制系统在改造前采用了串级PID控制策略,其调节效果不太理想,经常会发生主汽温与其设定值偏差较大、过热器壁温超限等现象,在机组控制系统改造以后,主汽温控制系统采用了基于增量式状态观测器的状态反馈控制与串级PID控制相结合的控制策略,采用基于增量式状态观测器的状态反馈能够预测主汽温变化的趋势,使得控制系统能够及时的进行调节,而采用常规的串级PID控制能够消除主汽温的稳态偏差,对于两侧过热器的热偏差问题,本文基于北仑电厂2号机组过热器的结构特性,加入了偏置发生器及跟踪功能,为运行人员提供了方便,实际运行效果表明,主汽温度的动态特性得了明显改善,过热器壁温得到了很好的控制,取得了较好的控制效果。
PID control strategy is used in main steam temperature control system for Beiltm Thermal Power Plant in Zhejiang province, and its effect is not good. The error between main steam temperature and its set point is big. Super heater wall temperature can exceed limit. After the reconstruct of the unit plant, a state feedback control strategy based on increment state observer is presented, which is combined with PID control. The state feedback can forecast the trend of main steam temperature, and the PID control can avoid the state error. The bias and track ftmction is given to solve the heat error, so it is convenience for workers. The actual rtmning result shows that the dynamic Characteristic of main steam temperature has been improved distinctly, the wall temperature of super heater has been controlled greatly, and it has excellent effects.
出处
《现代电力》
2006年第2期60-63,共4页
Modern Electric Power
关键词
单元机组
主汽温度控制
状态观测器
状态反馈
火电厂
unit plant
main steam temperature control
state observer
state feedback, power plant
