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Analysis and Reduction of Current and Voltage Ripple in DC-Link for Three-Level NPC Inverter-Fed Dual Three-Phase Motor Drives

Gu, M, Wang, Z and Dordevic, O (2022) Analysis and Reduction of Current and Voltage Ripple in DC-Link for Three-Level NPC Inverter-Fed Dual Three-Phase Motor Drives. IEEE Transactions on Power Electronics, 38 (4). pp. 5128-5140. ISSN 0885-8993

TPEL-2022 Gu Wang Dordevic.pdf - Accepted Version

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In this paper, switching strategies for DC-link current and voltage ripple reduction have been studied. Considered topology is a neutral-point clamped three-level (NPC-3L) inverter feeding a dual three-phase permanent-magnet synchronous motor (PMSM). The mechanisms of DC-link current and voltage ripple generation in NPC-3L inverter-fed PMSM drive are analysed in detail. Then, a two-step collaborative switching strategy is proposed, where the optimum switching sequences, including opposite small vectors, are applied in the two inverters collaboratively. Furthermore, the switching vectors of two inverters are rearranged in the sequence of their corresponding DC-link capacitor currents so that the overlapping of their peaks is avoided. Consequently, both the voltage ripple and current ripple in the DC-link capacitors are mitigated with the proposed two-step collaborative switching strategy. For the mid-point voltage of the NPC-3L inverter, the amplitude of fluctuation is reduced under low modulation index operation, while the high-frequency harmonic components are mitigated under high modulation index operation. The experimental results are given to verify the validity of the theoretical analysis and the proposed switching strategy.

Item Type: Article
Additional Information: © 2022 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Uncontrolled Keywords: 0906 Electrical and Electronic Engineering; Electrical & Electronic Engineering
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TK Electrical engineering. Electronics. Nuclear engineering
Divisions: Engineering
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
SWORD Depositor: A Symplectic
Date Deposited: 02 Dec 2022 11:15
Last Modified: 21 Feb 2023 11:30
DOI or ID number: 10.1109/tpel.2022.3224125
URI: https://researchonline.ljmu.ac.uk/id/eprint/18253
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