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水轮机调节系统是一类典型的非最小相位系统,为抑制其右半复平面零点所造成的负调,提出一种二自由度内模控制(IMC)—比例—积分—微分(PID)控制和模糊逻辑设定值加权的混合控制策略。基于内模控制设计的二自由度PID控制器不但能够减小负调,而且可以独立调节系统的目标跟随特性和干扰抑制特性,引入的模糊逻辑设定值加权系数可以在线修正控制器的比例增益,从结构上有效抑制负调的产生。仿真结果表明,该控制器对水轮机调节系统具有良好的控制效果。
The turbine governing system is a kind of typical non-minimum phase system. In order to suppress the negative tone caused by the right half-complex plane zero point, a two degree of freedom internal model control (IMC) -proportional-integral-derivative (PID) FUZZY LOGIC WEIGHTED HYBRID CONTROL STRATEGY. The two-degree-of-freedom PID controller based on the internal model control design not only can reduce the negative tone, but also can independently adjust the system’s target following characteristic and the interference suppression characteristic. The introduced fuzzy logic set value weighted coefficient can modify the controller’s proportional gain , From the structure effectively inhibit the production of negative tone. The simulation results show that the controller has a good control effect on the turbine governing system.