Evaluation of Temporary Overvoltages Considering Current Standards and Regulations with Extensive Renewables Integration

Abstract:
The extensive integration of Distributed Energy Resources (DERs) and electromobility requires a review of the protection systems in Low Voltage (LV) networks and customer installations. This paper provides an evaluation of Temporary Overvoltages (TOVs) in LV AC grids regarding current standards and regulations, when there is such an extensive integration. This could lead to asymmetric load configurations, causing TOVs when a Loss of Neutral (LoN) occurs. The results show that current regulations, mainly the Niederspannungsanschlussverordnung, permit the operation of highly asymmetric load configurations.Within the permitted range, the expected TOVs are lesser than explicit test and withstand voltages of facilities and devices, so that no further consideration is planned.