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