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A Control Strategy for Suppressing Circulating Currents in Parallel-Connected PMSM Drives With Individual DC Links.

Authors :
Wang, Fei
Wang, Yong
Gao, Qiang
Wang, Chengmin
Liu, Yubing
Source :
IEEE Transactions on Power Electronics. Feb2016, Vol. 31 Issue 2, p1680-1691. 12p.
Publication Year :
2016

Abstract

This paper proposes a novel circulating-current control strategy applied in back-to-back parallel three-phase converters with individual dc links for permanent magnet synchronous motor (PMSM) drives. First, the zero-sequence circulating current and the cross current paths in the whole parallel system are analyzed. Then, the models of an n-paralleled subsystem with individual dc links in both the three-phase stationary coordinates and the synchronous rotating coordinates are built up, which explores the fundamental mechanism of circulating current. Based on the analysis, a novel control strategy can suppress the circulating current at the motor side. The control system consists of two main loops in the d-axis, q-axis, and zero-axis, which are defined in this paper as sum control and difference control. The proposed control strategy effectively suppresses the circulating current in both steady-state and transient operations. The zero-sequence circulating current is greatly reduced by the difference control on the zero-axis. In addition, the bandwidth of the controllers is greatly improved, especially when the current-sharing inductance is much smaller than the stator inductance. Finally, with a PMSM load, the simulation and experiment results are presented to verify the theoretical analysis and proposed control strategy. [ABSTRACT FROM PUBLISHER]

Details

Language :
English
ISSN :
08858993
Volume :
31
Issue :
2
Database :
Academic Search Index
Journal :
IEEE Transactions on Power Electronics
Publication Type :
Academic Journal
Accession number :
110834620
Full Text :
https://doi.org/10.1109/TPEL.2015.2422791