A new method for discretizing continuous-time controllers is derived, via minimizing the variance of openloop transfer function owing to controller discretization. The discrete-time controller is directly obtained through solvingstandard H∞ Problem. The outstanding advantage of thes method is that the occurrence of intersample ripple is minimized and therefore makes the open-loop transfer function after controller discretization approximate its continuous-timecounterpart more closely. Simulation results show that thes method has apparent advantages over traditionaldiscretization methods.
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