Title Flexible Grid Connection and Islanding of SPC-Based PV Power Converters
Authors RODRÍGUEZ CORTÉS, PEDRO, Citro, Costantino, Candela, J. Ignacio, Rocabert, Joan, Luna, Alvaro, RODRÍGUEZ CORTÉS, PEDRO
External publication No
Means IEEE Trans Ind Appl
Scope Article
Nature Científica
JCR Quartile 1
SJR Quartile 1
JCR Impact 3.34700
Area International
Publication date 01/05/2018
ISI 000433089200071
DOI 10.1109/TIA.2018.2800683
Abstract At the present time, distributed generation systems are required to disconnect from the main grid when there is an outage. In order to fulfill this requirement, photovoltaic (PV) power plants are equipped with anti-islanding algorithms, embedded in the converters controller, to avoid the island operation. However, the current trends in the development of the future electrical networks evidence that it is technically feasible and economically advantageous to keep feeding islanded systems under these situations, without cutting the power supply to the loads connected to the network. Nevertheless, commercial PV power converters are programmed as grid-feeding converters and they are unable to work in island mode if there is not an agent forming the grid. In order to overcome this problem, the synchronous power controller (SPC) is presented in this paper as a suitable alternative for controlling PV inverters. As will be further discussed, this controller permits PV plants to operate seamlessly in grid-connected and island mode, with no need of changing the control structure in either case. Moreover, the participation of SPC-based power converters integrating energy storage enables other grid-feeding systems to contribute to the grid operation in island conditions. The good results achieved with the SPC in different conditions will be shown in simulations, and also with experiments considering a real PV power plant combining SPC and commercial PV inverters.
Keywords DC-AC power converters; distributed power generation; electric variables control; photovoltaic (PV) systems
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