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在串级控制中,由于内环的抗干扰控制器和外环的跟踪设定点控制器存在着耦合关系,因此在设计过程中不能对它们进行单独地设计,在工程应用中,常常会因为一个控制器的设计不当,而导致系统的重复设计。本文针对这一问题,采用了一种基于内模控制原理的二自由度的控制结构,该设计方案可以将控制系统的设定点响应与内环的抗干扰作用解耦。结合H2范数的性能指标设计了与控制方案结构相对应的设定点跟踪控制器和内环抗干扰控制器,每个控制器都可以单独地进行参数调整。火电厂中过热汽温系统是一类大滞后、大惯性的控制问题,在实践中大都采用串级的控制方式。在本文中将解耦二自由度串级控制策略应用到过热汽温控制中。从仿真结果来看,无论是系统跟踪设定点能力还是系统的抗干扰能力都得到了很大的改善。
In cascade control, because of the coupling relationship between the inner-loop anti-jamming controller and the tracking controller of the outer ring, they can not be designed separately in the design process. In engineering applications, it is often because of A controller is not properly designed, resulting in a system of repeated design. In this paper, a two-degree-of-freedom control structure based on the internal model control principle is adopted to solve this problem. The design scheme can decouple the setpoint response of the control system from the anti-jamming effect of the inner ring. Combined with the performance index of H2 norm, a setpoint tracking controller and an inner-loop anti-jamming controller corresponding to the control scheme are designed. Each controller can adjust the parameters separately. The superheated steam temperature system in thermal power plant is a kind of control problem with large lag and big inertia. In practice, most cascade control methods are adopted. In this paper, decoupling two degrees of freedom cascade control strategy is applied to superheated steam temperature control. From the simulation results, both system tracking set point capability or system anti-interference ability has been greatly improved.