Control strategy to maximize the power capability of PV three-phase inverters during voltage sags
Under voltage sags, grid-tied photovoltaic inverters should remain connected to the grid according to low-voltage ride-through requirements. During such perturbations, it is interesting to exploit completely the distributed power provisions to contribute to the stability and reliability of the grid....
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2016 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/81655 |
| Acceso en línea: | https://hdl.handle.net/2117/81655 https://dx.doi.org/10.1109/TPEL.2015.2451674 |
| Access Level: | acceso abierto |
| Palabra clave: | Distributed generation of electric power Electric current converters Distributed PV generation Low-voltage ride-through Maximum-rated current Reactive power injection Voltage sag Distributed generation inverters Grid-connected converters Control scheme Ride-through Dips Systems Components Faults Convertidors de corrent elèctric Energia elèctrica -- Conversió Àrees temàtiques de la UPC::Energies::Energia elèctrica Àrees temàtiques de la UPC::Energies::Energia elèctrica::Automatització i control de l'energia elèctrica |
| Sumario: | Under voltage sags, grid-tied photovoltaic inverters should remain connected to the grid according to low-voltage ride-through requirements. During such perturbations, it is interesting to exploit completely the distributed power provisions to contribute to the stability and reliability of the grid. In this sense, this paper proposes a low-voltage ride-through control strategy that maximizes the inverter power capability by injecting the maximum-rated current during the sag. To achieve this objective, two possible active power situations have been considered, i.e., high- and low-power production scenarios. In the first case, if the source is unable to deliver the whole generated power to the grid, the controller applies active power curtailment to guarantee that the maximum rated current is not surpassed. In the second case, the maximum allowed current is not reached, thus, the control strategy determined the amount of reactive power that can be injected up to reach it. The control objective can be fulfilled by means of a flexible current injection strategy that combines a proper balance between positive- and negative-current sequences, which limits the inverter output current to the maximum rated value and avoid active power oscillations. Selected experimental and simulation results are reported in order to validate the effectiveness of the proposed control strategy. |
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