Stability Analysis of Open-Loop V/Hz Controlled Asynchronous Machines and Two Novel Mitigation Strategies for Oscillations Suppression

Lorenzo Carbone, Simone Cosso, Krishneel Kumar, Mario Marchesoni, Massimiliano Passalacqua and Luis Vaccaro
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Lorenzo Carbone: Department of Electrical, Electronic, Tlc Engineering and Naval Architecture (DITEN), University of Genova, via all’Opera Pia 11a, 16145 Genova, Italy
Simone Cosso: Department of Electrical, Electronic, Tlc Engineering and Naval Architecture (DITEN), University of Genova, via all’Opera Pia 11a, 16145 Genova, Italy
Krishneel Kumar: Department of Electrical, Electronic, Tlc Engineering and Naval Architecture (DITEN), University of Genova, via all’Opera Pia 11a, 16145 Genova, Italy
Mario Marchesoni: Department of Electrical, Electronic, Tlc Engineering and Naval Architecture (DITEN), University of Genova, via all’Opera Pia 11a, 16145 Genova, Italy
Massimiliano Passalacqua: Department of Electrical, Electronic, Tlc Engineering and Naval Architecture (DITEN), University of Genova, via all’Opera Pia 11a, 16145 Genova, Italy
Luis Vaccaro: Department of Electrical, Electronic, Tlc Engineering and Naval Architecture (DITEN), University of Genova, via all’Opera Pia 11a, 16145 Genova, Italy

Energies, 2022, vol. 15, issue 4, 1-15

Abstract: Asynchronous machines are always widely used in most industrial applications due to their reliability, flexibility, and manoeuvrability. To achieve variable speed operations, the quite simple open-loop V/Hz control is largely utilized. Under open-loop V/Hz control, the nonlinear interaction is well known to cause current and torque oscillations while operating at low to medium speeds under light loads. This article presents the stability analysis of induction motors at low–medium frequencies under no-load conditions with the V/Hz control. A system representation in the form of state space is discussed, and the region of instability is plotted against the V/f plane. Two novel and refined methods for the mitigation of oscillations in the region of instability are presented. The two proposed algorithms are finally tested and validated through simulation on an inverter-fed induction motor drive system.

Keywords: instability; eigenvalues; oscillations; V/Hz control; stability analysis; active damping; small-signal model; induction motor drive (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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