Estimation of the untapped regenerative braking energy in urban electric transportation network

The paper presents an estimation of the reserves of untapped regenerative braking energy in the power supply network of urban electric transport. The estimation is made by a method based on probabilistic principles, transport timetable and measured power diagrams. The amount of unused regenerative energy is calculated for two substations in the electric transport network in Riga, with power measurement technique described for T3A tramcars. The results of the work allow calculation of economical aspects of the regenerative braking energy utilization not only for the current situation but also for future, taking into account growth in the transport fleet and changes in its organization.