Optimal Placement and Sizing of Solar Power Plant for Voltage Stability Improvement

This paper addresses the problem of determining the optimal location and capacity of solar power plants in distribution networks to improve voltage stability. Key voltage-related indicators, such as voltage stability and power losses, were analysed on standard IEEE 69 network to identify the optimal location for connecting a solar power plant. The growing deployment of distributed energy resources highlights the importance of proper sizing and positioning of these sources, as improperly located or oversized solar power plants can lead to voltage rise, reverse power flows, and system performance degradation. The purpose of this analysis is to assess how solar power plants, which will be potentially connected to the network, affect voltage stability in distribution networks with limited hosting capacity for renewable energy sources. These issues are particularly significant in cases where the installed capacity of solar power plants awaiting connection exceeds the hosting capacity of the observed part of the distribution network, raising the question of connection prioritization.