Modeling and Dynamic Simulation of Non-standard Operating Conditions in Low-Voltage Grids Considering Different Network Topologies

The transition towards renewable energy sources creates new challenges for power distribution grids. As a result, new requirements and specifications are needed to ensure network stability. Especially in low-voltage (LV) grids, where the majority of electricity consumers and distributed generators are connected, high network utilization and possible power quality (PQ) disturbances are expected. This paper presents a model of a real LV grid to assess dynamic behavior of PQ disturbances and the risks associated with non-standard operating conditions. The propagation of PQ disturbances using sensitivity analysis in both heavily and lightly loaded grids is investigated through dynamic simulations. Additionally, two network topologies, radial and ring, are considered. The utilization of the ring topology in the LV grid shows notable advantages compared to the radial topology, particularly in case of voltage unbalance.