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Photovoltaic (PV) power generation is not only clean green energy but is also especially appropriate for smart grids with distributed power generation. For a good exploitation of a PV system there are some regulations to be respected in accordance with local normative. Voltage and reactive power are two very stringent variables to be monitored. During voltage and reactive power control, dangerous transient phenomena could appear. Especially low active power commutation leads to overvoltages and unexpected current circulations. This work discusses the causes, effects and recommendations regarding above phenomena by interpreting the recorded oscillograms logged by the digital protective relays.
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