Abstract
The upcoming adoption of low-voltage-ride-through requirements in low-voltage distribution systems is expected to raise significant challenges in the operation of grid-tied inverters. Typically, these inverters interconnect photovoltaic units, which are the predominant distributed energy resource in low-voltage distribution networks, under an umbrella of standards and protection schemes. As such, a challenging issue that should be considered in low-voltage distribution network applications, regards the coordination between the line protection scheme (typically consisting of a non-settable fuse) and the low-voltage-ride-through operation of photovoltaic generators. During a fault, the fuse protecting a low-voltage feeder may melt, letting the generator to continue its ride-through operation. Considering that the efficacy/speed of the anti-islanding detection is affected by ride-through requirements, this situation can lead to protracted energization of the isolated feeder after fuse melting (unintentional islanding). To address this issue, this paper proposes a fault-current-limitation based solution, which does not require any modification in the existing protection scheme. The operation principles, design, and implementation of this solution are presented, while, its effectiveness is supported by extensive simulations in a test-case low-voltage distribution system. A discussion on the presented results concludes the paper.
Highlights
The mass integration of distributed generation (DG) into distribution systems has forced several distribution system operators (DSOs) around the world to impose low-voltage-ride-through (LVRT)requirements [1]
LVRT regards the capability of a DG-unit to remain connected to the network during faults, providing voltage support, for a time duration which depends on the voltage drop at the point of common coupling (PCC)
Distribution systems, which have been received from the European LV distribution systems, which have been received from the Hellenic Distribution Network
Summary
The mass integration of distributed generation (DG) into distribution systems has forced several distribution system operators (DSOs) around the world to impose low-voltage-ride-through (LVRT)requirements [1]. The mass integration of distributed generation (DG) into distribution systems has forced several distribution system operators (DSOs) around the world to impose low-voltage-ride-through (LVRT). LVRT regards the capability of a DG-unit to remain connected to the network during faults, providing voltage support, for a time duration which depends on the voltage drop at the point of common coupling (PCC). This requirement has been initially recommended for transmission systems and large wind-turbine units, especially those whose fault response might be critical for the system stability. The LVRT requirements for distribution systems are mainly applied to the medium-voltage (MV) level, their extension to the low-voltage (LV) distribution networks is currently
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