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以离散H∞全信息问题为基础，给出并证明了离散系统一类扰动前馈问题的设计方法，得到了控制器的参数化描述，在此基础上，研究了离散双自由度设计的H∞方法，在这一类问题中，相应标准离散H∞设计中的第二个离散代数Riccati方程不再需要求解．最后对精馏塔系统进行设计，得到了满意的结果．
Based on the discrete H∞ complete information problem, a design method of a class of disturbance feedforward problems for discrete systems is given and proved. The parameterized description of the controller is given. Based on this, the design of discrete two degrees of freedom H ∞ method. In this kind of problem, the second discrete algebraic Riccati equation in the corresponding standard discrete H∞ design no longer needs to be solved. Finally, the design of the distillation column system has been satisfied with the results.