Abstract
The leakage current in photovoltaic (PV) systems, which is also known as residual current is a consequence of the parasitic capacitance between the PV and the ground (free-field PV plants) or the PV system and the structure of the object that is grounded (roof-top PV plants). When the PV system-power grid parasitic capacitance forms a loop, the common mode voltage will produce a common mode current across the parasitic capacitance. The motivation for writing this short study came from practice where the authors faced the mentioned problem on a specific PV power plant with an output power of 500kW. Therefore, the main topic of the paper will be the topologies of PV inverters and their additional impact on the residual current, as well as ways of its detection. An overview of the relevant standards in this field and some possible techniques for controlling leakage currents in FN systems with solar inverters will also be given.
Published Version
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