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Energies 2017, 10(7), 950; doi:10.3390/en10070950

Synchronous Power Control of Grid-Connected Power Converters under Asymmetrical Grid Fault

1
Electrical Engineering Department, Technical University of Catalonia, Barcelona 08222, Spain; rocabert@ee.upc.edu (J.R.); candela@ee.upc.edu (J.I.C.); prodriguez@uloyola.es (P.R.)
2
Department of Engineering, Loyola University of Andalucia, Seville 41014, Spain
*
Author to whom correspondence should be addressed.
Received: 6 June 2017 / Revised: 5 July 2017 / Accepted: 6 July 2017 / Published: 8 July 2017
(This article belongs to the Special Issue Grid-Connected Photovoltaic Systems)

Abstract

Control of grid-connected power converters is continuously developing to meet the grid codes, according to which the generation units should keep connected to the grid and further provide ancillary services, such as voltage and frequency support, negative sequence current injection, inertia emulation, etc. A virtual admittance controller is proposed in this paper for the objective of voltage support under asymmetrical grid faults. By using independent and selective admittances for positive and negative sequence current injection, the unbalanced voltage can be significantly compensated during asymmetrical faults. The controller is based on the generic control framework of the synchronous power controller (SPC), which is able to control a power converter with emulated and improved synchronous generator characteristics. Simulation and experimental results based on two paralleled 100 kW grid-connected power converters demonstrate the controller to be effective in supporting unbalanced voltage sags. View Full-Text
Keywords: sodium-ion battery; cathode; grid-connected power converter; power converter control; synchronous power controller; virtual admittance sodium-ion battery; cathode; grid-connected power converter; power converter control; synchronous power controller; virtual admittance
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Zhang, W.; Rocabert, J.; Candela, J.I.; Rodriguez, P. Synchronous Power Control of Grid-Connected Power Converters under Asymmetrical Grid Fault. Energies 2017, 10, 950.

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