A Method of Seamless Transitions Between Grid-Tied and Stand-Alone Modes of Operation for Utility-Interactive Three-Phase Inverters

A method for the seamless transition of three-phase inverters switched between grid-tied and stand-alone modes of operation is presented in this paper. In this method, only the inverter current and voltage sensors are utilized, and no control over the grid-side static transfer switch is needed. The...

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Bibliographic Details
Published in:IEEE transactions on industry applications 2014-05, Vol.50 (3), p.1934-1941
Main Authors: Ochs, David S., Mirafzal, Behrooz, Sotoodeh, Pedram
Format: Article
Language:English
Subjects:
Algorithms
Electric potential
grid-tied and stand-alone modes
Inverters
Overcurrent
Phase transformations
Seamless transition
Sensors
Strategy
Switches
Transient analysis
utility interactive inverters
Voltage
Voltage control
Voltage measurement
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Summary:A method for the seamless transition of three-phase inverters switched between grid-tied and stand-alone modes of operation is presented in this paper. In this method, only the inverter current and voltage sensors are utilized, and no control over the grid-side static transfer switch is needed. The presented method contains two strategies for grid-tied-to-stand-alone and stand-alone-to-grid-tied transitions. In the stand-alone-to-grid-tied transition strategy, a novel algorithm is presented for estimating the grid angle nearly instantaneously, which allows the three-phase inverter to respond very quickly if the grid and point-of-common-coupling voltages are out of phase. This fast response allows the inverter to effectively eliminate the transient overcurrent that would normally occur if it was connected to the grid without first being synchronized. The fast response also allows the inverter to return to normal operation very quickly after such an event. The strategy for the seamless transition from grid-tied to stand-alone mode is also presented. These strategies have been verified through experiments, and the results are presented in this paper.
ISSN:0093-9994
1939-9367
DOI:10.1109/TIA.2013.2282761