A modification of the PI setting of the Ziegler-Nichols closed loop tuningmethod is proposed. The modification is based on a combination of the Skogestad SIMCtuning formulas for ´´integrator plus time-delay´´ processes with the Ziegler-Nichols tuning formulas assuming that the process is modeled as an ´´integrator plus time-delay´´ process. The resulting PI settings provide improved stability margins compared with those obtained with the original Ziegler-Nichols PI settings. Compared with the well-known Tyreus-Luyben PI settings, the proposed PI settings give improved disturbance compensation. For processes with zero or a negligible time-delay, but with some lags in the form of time-constants, tuning based on ultimate gain and ultimate period may give poor results. Successful PI settings for such processes are proposed. ; Published version
Relaxed Ziegler-Nichols closed loop tuning of PI controllers
19.04.2017
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
relay-tuning , open loop , closed loop , tuning , stability , Ziegler-Nichols , robustness , 553 , performance , Tyreus-Luybe , Skogestad , PI controller
DDC: | 629 |
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