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

Weiyi Zhang, Joan Rocabert, J. Ignacio Candela and Pedro Rodriguez
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Weiyi Zhang: 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.)
Joan Rocabert: 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.)
J. Ignacio Candela: 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.)
Pedro Rodriguez: 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.)

Energies, 2017, vol. 10, issue 7, 1-21

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.

Keywords: sodium-ion battery; cathode; grid-connected power converter; power converter control; synchronous power controller; virtual admittance (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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