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针对火电厂过热汽温被控对象具有大迟延、大惯性的特点,且对象特性随负荷变化较大等因素,很难实现稳定和高性能的控制。针对这一特点,提出了基于多模型的内模控制策略,通过在不同工况辩识得到局部模型,根据加权因子计算出全局多模型,设计出相应的内模控制器,根据运行工况选择相应的控制器,从而实现全工况运行的自适应控制。仿真结果表明,该控制策略比常规的单内模控制在更大范围具有较好的控制品质。
In view of the fact that the controlled object with superheated steam temperature in thermal power plant has the characteristics of large delay and large inertia and the characteristics of the object vary greatly with load, it is difficult to achieve stable and high-performance control. In view of this characteristic, a multi-model internal model control strategy is proposed. By identifying partial models in different working conditions and calculating the global multi-model according to the weighting factors, a corresponding internal model controller is designed and selected according to the operating conditions The corresponding controller, so as to realize the adaptive control of all working conditions. Simulation results show that the proposed control strategy has better control quality in a wider range than conventional single-internal-model control.