17‐level inverter with low component count for open‐end induction motor drives. Issue 5 (1st March 2018)

• Record Type: Journal Article
• Authors: Kshirsagar, Abhijit; Kaarthik, R. Sudharshan; Rahul, Arun; Gopakumar, K.; Umanand, Loganathan; Biswas, Sujit K.; Cecati, Carlo
• Is Part Of: IET power electronics. Volume 11:Issue 5(2018)
• Page Start: 922
• Page End: 929
• Publication Date: 2018-03-01
• Subjects: induction motor drives -- invertors -- power semiconductor switches -- capacitor switching -- voltage control -- machine control; 17‐level inverter‐based induction motor drive -- low component count -- open‐end IM drives -- high‐resolution multilevel voltage space‐vector generation -- three‐level inverter -- seven‐level inverter -- open‐end winding induction machine -- unequal DC supplies -- switches -- floating capacitors‐per‐phase -- switching states -- capacitors voltage control -- phase currents -- modulation scheme -- level‐shifted carriers -- V‐f control -- d‐q control -- low effective switching frequency -- low‐voltage inverter -- traction applications -- industrial drives; Power electronics -- Periodicals; 621.31705
• DOI: 10.1049/iet-pel.2017.0492
• Languages: English
• ISSNs: 1755-4535

Abstract

Abstract : This study presents a 17‐level inverter‐based induction motor drive for high‐resolution multilevel voltage space‐vector (SV) generation. The proposed topology consists of a three‐level inverter and a seven‐level inverter connected to an open‐end winding induction machine. The two inverters are powered by two unequal DC supplies, resulting in a low component count, with just 12 switches and three floating capacitors per phase. The voltage SVs applied by the two inverters are chosen to eliminate circulating power flow and prevent DC bus overcharging. In addition, the switching states of both inverters are chosen in order to keep voltages of all floating capacitors well‐controlled. Since the capacitors voltages are controlled using the phase currents, additional pre‐charging circuitry is not required. A modulation scheme using level‐shifted carriers has also been developed, which can be used with both V/f control and d–q control. The high‐voltage inverter has a low effective switching frequency and the low‐voltage inverter has a high effective switching frequency, reducing the switching loss. The included results of steady‐state and transient testing of an experimental prototype demonstrate that the proposed scheme is suited for industrial drives and traction applications.