摘要
针对火电机组过热汽温控制的难点和要求,常规串级控制系统无法达到良好控制效果,尤其在大范围变负荷过程中很难控制汽温动态偏差在要求范围内。分析了基于机理模型的双回路汽温控制原理和控制参数整定方法,并对控制方案进行优化。应用于某300 MW CFB机组过热汽温控制,结果表明其稳态和动态控制品质良好,并能适应机组大范围变负荷需要。由于控制方案能够灵活配置汽温控制中惰性区传递函数时间常数和对控制器参数进行增益调整,因此在工程应用中具有很好的推广作用。
This paper focuses on difficulties of the super heating steam temperature control for thermal power units and requirements. Conventional cascade control system can not achieve good control effect, especially in the wide range of load change. It is difficult to control the steam temperature deviation in the dynamic requirements. The article analyzes the double loop based on mechanism model steam temperature control principle and control parameter setting method. It also optimizes the control scheme. It is applied to the su- per heated steam temperature control of 300 MW CFB unit. the results show that the steady state performance and the dynamic perform- ance have good quality and it can adapt to the wide range of load change. The control scheme can flexibly configure the time constant of the inertia transfer function in the steam temperature control and adjust the gain of the controller parameters. It has a good promotion in engineering applications.
出处
《东北电力技术》
2017年第4期39-41,51,共4页
Northeast Electric Power Technology
关键词
双回路
过热汽温
PTn环节
焓差
变负荷
double loop
super heating steam temperature
PTn module
enthalpy deviation
load change
