generalized Hermite-Biehler Theorem and obtain the stable region using an Inverse-Nyquist chart method. For certain ,we apply a Counterclockwise-law method to define the two-dimensional stable region of , on this basis, through traversing the , we can obtain the three-dimensional stable space of PID controller parameters. Then, for the interval system with Time-Delay, based on the generalized Kharitonov Theorem, we pide it into some certain subsystems. can be obtained by the formula . For certain , the two-dimensional stable region of for the interval system can be defined through the formula . Through traversing the , we can obtain the three-dimensional stable space of PID controller parameters for the interval system. The simulation verifies the effectiveness of the algorithm.
Keywords PID Controller Stable Regions Time-Delay Interval Systems
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