Optimization of Power Supply System of Motorway Energy Consumers through Reliability Analyses

This paper presents assessment of selected concept of medium voltage (MV) and low voltage (LV) power supply system of motorway energy consumers/systems on the Pan-European motorway corridor, branch Vc, in Bosnia and Herzegovina (BiH) through methods of reliability analyses. Assessment of selected concept is performed through comparison with different, enhanced and reduced, possible MV network and MV/LV transformer substation configurations. Comparison and analysis of different configurations have been made using of serial, parallel, serial-parallel and delta-star reliability model and Fault tree model. Objective was to confirm that selected concept offers optimized technical solution which provides reliable power supply, failure rate of the supply system as low as possible, together with relative simplicity of design. The results from the selected approach of reliability analyses indicate that this power supply concept entirely based on direct power supply from the primary transformer stations 110/x kV, which ensures two-sided MV power supply of MV/LV transformer substations and their redundant configuration provides reliable power supply of motorway consumers.