Enhanced control for improving the operation of grid-connected power converters under faulty and saturated conditions
In renewable energy based systems Grid-Connected Voltage Source Converters (GC-VSC) are used in many applications as grid-feeding converters, which transfer the power coming from the renewable energy sources to the grid. In some cases, the operation of GC-VSC may become unstable or uncontrollable du...
| Autores: | , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2018 |
| 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:2117/120135 |
| Acceso en línea: | https://hdl.handle.net/2117/120135 https://dx.doi.org/10.3390/en11030525 |
| Access Level: | acceso abierto |
| Palabra clave: | Electric current converters Electric fault location Electric controllers Renewable energy sources current control current reference generation Low Voltage Ride Through (LVRT) grid connected voltage source converter renewable resource Proportional-Resonant (PR) controller Convertidors de corrent elèctric Sistemes de distribució d'energia elèctrica -- Estabilitat Energies renovables Àrees temàtiques de la UPC::Energies::Energia elèctrica::Automatització i control de l'energia elèctrica Àrees temàtiques de la UPC::Enginyeria electrònica::Electrònica de potència::Convertidors de corrent elèctric |
| Sumario: | In renewable energy based systems Grid-Connected Voltage Source Converters (GC-VSC) are used in many applications as grid-feeding converters, which transfer the power coming from the renewable energy sources to the grid. In some cases, the operation of GC-VSC may become unstable or uncontrollable due to, among others: a grid fault or an inappropriate current-power reference, that give rise to fast electrical transients or a saturation of the controller. In this paper, an improved control scheme is proposed to enhance the controllability of GC-VSC in all these situations. This solution consists of two parts, on the one hand a new Proportional-Resonant (PR) controller with anti-windup capability to be used as current controller, and secondly a new current/power reference modifier, which defines the suitable reactive current/power reference to keep the system stable. It is worth to mention that the proposed scheme does not need information about the grid parameters as it only uses the converter current, and the voltage at the capacitors of Inductor-Capacitor (LC) output filter |
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