Research on the mechanism of neutral-point voltage fluctuation and capacitor voltage balancing control strategy of three-phase three-level T-type inverter

Yan, Gangui, Duan, Shuangming, Zhao, Shujian, Li, Gen ORCID: https://orcid.org/0000-0002-0649-9493, Wu, Wei and Li, Hongbo 2017. Research on the mechanism of neutral-point voltage fluctuation and capacitor voltage balancing control strategy of three-phase three-level T-type inverter. Journal of Electrical Engineering and Technology 12 (6) , pp. 2227-2236. 10.5370/JEET.2017.12.6.2227

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Abstract

In order to solve the neutral-point voltage fluctuation problem of three-phase threelevel T-type inverters (TPTLTIs), the unbalance characteristics of capacitor voltages under different switching states and the mechanism of neutral-point voltage fluctuation are revealed. Based on the mathematical model of a TPTLTI, a feed-forward voltage balancing control strategy of DC-link capacitor voltages error is proposed. The strategy generates a DC bias voltage using a capacitor voltage loop with a proportional integral (PI) controller. The proposed strategy can suppress the neutral-point voltage fluctuation effectively and improve the quality of output currents. The correctness of the theoretical analysis is verified through simulations. An experimental prototype of a TPTLTI based on Digital Signal Processor (DSP) is built. The feasibility and effectiveness of the proposed strategy is verified through experiment. The results from simulations and experiment match very well.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Publisher:	The Korean Institute of Electrical Engineers
ISSN:	1975-0102
Date of First Compliant Deposit:	20 March 2018
Date of Acceptance:	23 August 2017
Last Modified:	19 Nov 2024 07:45
URI:	https://orca.cardiff.ac.uk/id/eprint/110056

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