摘要
针对中速磨煤机制粉系统进行了机理建模,采用现场数据,使用预报误差法对模型参数进行辨识,得到一个较为准确的模型。再根据机理模型,采用滚动时域估计方法对中速磨煤机出口煤量进行估计,并同模型的输出进行了比较。分析了现有中速磨煤机控制系统存在的不足,提出将中速磨煤机出口煤量作为被控量,设计推断预测控制器。仿真结果表明:这种推断预测控制方法可以缩短制粉系统侧的延迟时间,加快机组对AGC指令的响应。
A mechanism model was established for the pulverizing system of a medium-speed coal mill, of which the parameters were identified with field data by prediction error method, so as to obtain a more accurate model. According to the mechanism model, the moving horizon estimation method was used to estimate the outlet flow of the coal mill, and subsequently the estimated results were compared with model outputs. Based on analysis of the disadvantages existing in the control system of present medium-speed coal mills, an inferential predictive controller was designed by taking the mill outputs as the controlled variables. Simulation results show that the new control method can shorten the delay time of the coal pulverizing system and speed up the response of the unit to AGC command.
出处
《发电设备》
2017年第1期9-13,共5页
Power Equipment
关键词
中速磨煤机
滚动时域估计
预测控制
medium-speed coal mill
moving horizon estimation
predictive control
