DC Current Control for a Single-Stage Current Source Inverter in Motor Drive Application

• Published in: IEEE transactions on power electronics Vol. 36; no. 3; pp. 3367 - 3376
• Main Authors: Migliazza, Giovanni, Buticchi, Giampaolo, Carfagna, Emilio, Lorenzani, Emilio, Madonna, Vincenzo, Giangrande, Paolo, Galea, Michael
• Format: Journal Article
• Language: English
• Published: New York IEEE 01-03-2021; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Circuits; Converters; Current control; Current source inverter; Current sources; dc current control; electric drive system; electric machine control; Electric potential; Industries; Inverters; Mathematical model; Modulation; Motor drives; Permanent magnets; Stability analysis; Synchronous machines; Topology; Variable speed drives; Voltage
• ISSN: 0885-8993; 1941-0107
• DOI: 10.1109/TPEL.2020.3013301

The current source inverter (CSI) is a power electronics topology that allows for the realization of variable speed drives (VSD). Compared to the most common voltage source inverter (VSI), which can be directly connected to a voltage source, the CSI needs a prestage to generate a constant current bus. This article therefore seeks to challenge this "accepted" consideration that a CSI always needs this precircuit and seeks to remove this circuit by proposing an innovative <inline-formula><tex-math notation="LaTeX">i_{dc}</tex-math></inline-formula> current control scheme. The proposed scheme is applied to a single stage motor drive driven by a CSI converter. It is shown how implementing this control scheme removes the need for the front-end stage, thus removing an unnecessary converter and optimizing the efficiency at the same time. The CSI state-space equations are presented and the developed models are verified using simulations. Stability analysis of small-signal model is considered through Nyquist criterion with the robustness in presence of variations of the most important system parameters. Experimental results driving a permanent magnet synchronous machine (PMSM) are shown confirming the validity of the proposed control, potentially paving the way to a larger adoption of the CSI topologies for motor drive applications.