Identification of the Optimal Electrical Interconnection Point for Exporting Solar Energy to the Southern European Countries

Abstract

With a growing demand for electric power, interconnecting national grids is crucial for ensuring stability and creating economic benefits through energy export1. This paper evaluates the transmission lines of the Libyan Electrical Network to determine their capacity to accommodate additional power for export the electrical energy to the Southern Europe Countries. The study simulates the injection of power from new photovoltaic (PV) stations in Ghadames, Asdaada, Hoon, and Bani Walid, and then analyses the grid's stability when this power is withdrawn from two potential coastal interconnection points, Al-Garaboly and Al-Khoms. Using NEPLAN software, network performance was assessed under normal (N) and contingency (N-1) conditions across three scenarios, which are: the existing Libyan grid scenario, and changing the existing ratio of Current Transformer (CT) scenario, the final scenario is integration of new 400 kV lines currently under construction. The results indicate that Al-Khoms is a more robust interconnection land point than Al-Garabuli. The most effective strategy for increasing export capacity involves activating the new 400 kV lines, which allowed for a maximum stable export of 1430 MW from Al-Khoms Station and 660 MW from Al- Garaboly Station under N-1 conditions. The evaluation of the transmission network is a fundamental aspect in selecting the optimal connection land point. However, several other considerations influence the final decision regarding the connection, such as the route of the submarine cable. These considerations include environmental studies that account for sensitive areas such as coral reefs and ecological impacts, in addition to oil concessions and military sites etc. It is essential to consider these factors to determine the best electrical connection point.