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。
Aiming at the difficulties and requirements of superheated steam temperature control in thermal power units,conventional cascade control system can not achieve good control effects,dynamic error of steam temperature is difficult to be controlled within the required range especially in the wide range of load change. Analyzed the theory of double loop steam temperature control system base on mechanism model and its configuration method of control parameter and optimized the control scheme. Applied to the superheated steam temperature control of 300 MW CFB unit,the results shown that the steady state performance and the dynamic performance are of 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,thus it has a good promotion in engineering applications.
出处
《南方能源建设》
2017年第2期73-76,共4页
Southern Energy Construction
关键词
机理模型
过热汽温
PTn环节
焓差
变负荷
mechanism model
superheating steam temperature
PTn module
enthalpy deviation
load change
