摘要
针对零出力运行方式下,供热机组低压缸进汽流量与次末级蒸汽温度存在强非线性相关,造成常规控制方法难以保证系统全局稳定性的问题,研究了一种模糊多模型内模控制策略。依据对象增益变化规律,将对象划分为负增益区、近零负增益区、近零正增益区、正增益区,分别建立模型并设计内模控制器,并通过模糊加权方式得到最终控制输出。在近零增益区内推导出的内模控制稳定准则,可以控制系统适应对象增益在小范围内正负变化。仿真验证表明,控制系统具有全局稳定性及足够的鲁棒性。
In the zero-output operation mode, there is a strong nonlinear correlation between the inlet flow rate of low-pressure cylinder of heating units and the temperature of the secondary last steam stage,which makes it difficult for the conventional control method to ensure the global stability of the system.Thus, a fuzzy multi model internal model control strategy is studied.According to the rule of object gain variation, the object is divided into negative gain region, near zero negative gain region, near zero positive gain region and positive gain region.The model is established with designing the internal model controller, and the final control output is obtained by fuzzy weighting method.The stability criterion of IMC derived in the near zero gain region can control the system to adapt to the positive and negative changes of object gain in a small range.The simulation results show that the control system has global stability and sufficient robustness.
作者
姚珺
刘鑫屏
YAO Jun;LIU Xinping(School of Control and Computer Engineering,North China Electric Power University,Baoding 071003,China)
出处
《电力科学与工程》
2022年第6期61-69,共9页
Electric Power Science and Engineering
基金
中央高校基本科研业务费(2021MS090)。
关键词
供热机组
汽轮机运行
低压缸零出力
强非线性
模糊多模型
内模控制
heating unit
steam turbine operation
low pressure cylinder zero output
strong nonlinear
fuzzy multi-model
internal model control
作者简介
通信作者:姚珺(1998-),女,硕士研究生,研究方向为热电联产机组灵活性改造;刘鑫屏(1976-),女,副教授,研究方向为大型火电机组建模及软测量。
