基于改进型动态矩阵预测的主蒸汽温度串级控制策略研究  

Improved dynamic matrix prediction based cascade control strategy of main steam temperature

作　　者：叶向前[1] 崔春雷[2] 易凤飞[2] 方彦军[2] 

机构地区：[1]广东电网公司电力科学研究院,广东广州510080 [2]武汉大学动力与机械学院,湖北武汉430072

出　　处：《热力发电》2013年第7期50-55,共6页Thermal Power Generation

摘　　要：在常规PID主蒸汽温度串级控制系统的主控制回路中加入动态矩阵预测(DMC)控制器构成DMC-PID主蒸汽温度串级控制系统,以实现在非精确数学模型下对具有大延迟主蒸汽温度控制对象进行长时域的预测输出。根据系统的阶跃响应建立了系统的DMC模型,设置了优化函数和预测参考轨迹,并提出了对模型动态矩阵进行实时更新和大延迟校正的改进方法,从而改善了预测控制的动态性能。以某660MW机组为例,对DMC-PID主蒸汽温度串级控制系统进行仿真试验,结果表明DMC-PID主蒸汽温度串级控制系统较常规PID主蒸汽温度串级控制系统具有更好的稳定性和快速响应性,且抗干扰能力强。To realize long time output prediction for main steam temperature control object with large delay under imprecise mathematical model,a main steam temperature DMC-PID cascade control system with a dynamic matrix prediction controller(DMC)in master loop of the conventional main steam temperature PID cascade system was constructed and presented.On the basis of system step response,the system's DMC predictive model was established,and the optimization function and prediction reference trajectory was set.Moreover,a modified method for the dynamic matrix real-time updating and large delay revise was proposed to improve the dynamic performance of predictive control.Simulation test on main steam temperature DMC-PID cascade control system of a 660MW unit revealed that,compared with the conventional main steam temperature PID cascade control system,this DMC-PID system had better stability,speedability,and stronger anti-interference capability.

关 键 词：主蒸汽温度 串级控制 动态矩阵预测 DMC控制器 DMC-PID 

分 类 号：TM621[电气工程—电力系统及自动化] TP273+.1[自动化与计算机技术—检测技术与自动化装置]