Design methodology for the frequency shift method of islanding prevention and analysis of its detection capability
Fecha
2005Versión
Acceso abierto / Sarbide irekia
Tipo
Artículo / Artikulua
Versión
Versión aceptada / Onetsi den bertsioa
Impacto
|
10.1002/pip.613
Resumen
Islanding protection is one of the most important sources of discrepancy in gridconnected photovoltaic systems. Even when islanding is not very likely to happen,
regulations demand the photovoltaic inverters to implement effective protection methods. Due to its several advantages, the frequency shift method of islanding prevention,
commonly known as Sandia Frequency Shift, is one of the most im ...
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Islanding protection is one of the most important sources of discrepancy in gridconnected photovoltaic systems. Even when islanding is not very likely to happen,
regulations demand the photovoltaic inverters to implement effective protection methods. Due to its several advantages, the frequency shift method of islanding prevention,
commonly known as Sandia Frequency Shift, is one of the most important active methods. This method implements a positive feedback of the frequency that tends to move it
outside the trip limits in case of islanding. The method shows a very high detection
capability, which depends on both the values of the method parameters and the characteristics of the load that remains in the same power section after islanding.
This paper develops a mathematical analysis of the Sandia Frequency Shift method
and proposes a new methodology to design its parameters as a trade-off between the
detection capability, which is evaluated as a function of the load characteristics, and
the distortion that the method could introduce in the grid as a consequence of transitory frequency disturbances. The ability of this methodology to design the method
parameters and achieve the highest detection capability is satisfactorily proved by
means of both simulation and experimental results on a commercial photovoltaic
inverter that implements the method once its parameters have been designed with
the proposed methodology. [--]
Materias
Grid-connected photovoltaic inverters,
Inverters,
Islanding,
Protection,
Photovoltaic power systems
Editor
Wiley
Publicado en
Progress in Photovoltaics: Research and Applications, 2005; 13:409–428
Departamento
Universidad Pública de Navarra. Departamento de Ingeniería Eléctrica y Electrónica /
Nafarroako Unibertsitate Publikoa. Ingeniaritza Elektrikoa eta Elektronikoa Saila