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Control of Parallel Connected Three-Phase PWM Converters without Inter-Module Reactors

Lookup NU author(s): Bassim Jassim, Dr Bashar Zahawi, Dr Dave Atkinson

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Abstract

This paper presents a new current sharing control strategy for parallel-connected, synchronised three-phase DC-AC converters employing space vector pulse width modulation (SVPWM) without current sharing reactors. Unlike conventional control methods, the proposed method breaks the paths of the circulating current by dividing the switching cycle evenly between parallel connected equally rated converters. Accordingly, any inter-module reactors or circulating current control will be redundant, leading to reductions in system costs, size, and control algorithm complexity. Each converter in the new scheme employs a synchronous dq current regulator that uses only local information to attain a desired converter current. A stability analysis of the current controller is included together with a simulation of the converter and load current waveforms. Experimental results from a 2.5kVA test rig are included to verify the proposed control method.

Publication metadata

Author(s): Jassim BMH, Zahawi B, Atkinson DJ

Publication type: Article

Publication status: Published

Journal: Journal of Power Electronics

Year: 2015

Volume: 15

Issue: 1

Pages: 116-122

Print publication date: 01/01/2015

Acceptance date: 04/09/2014

ISSN (print): 1598-2092

ISSN (electronic): 2093-4718

Publisher: Korean Institute of Power Electronics

URL: http://dx.doi.org/10.6113/JPE.2015.15.1.116

DOI: 10.6113/JPE.2015.15.1.116

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