The article deals with PSIM simulation results of the regenerative energy storage process with supercapacitors installed on the renewed Tatra T3A tramcars. Bidirectional supercapacitor's current controller is connected to the filter capacitor of the tram DC converter and in the tram braking mode operates as a buck converter. The control scheme of the buck converter is suggested with two PID control loops: with filter capacitor voltage and supercapacitor current feedback. The results of PSIM simulation of tramcar braking process are given with and without overhead current fluctuations. Simulation results show the control system's stability in both synchronous and asynchronous operation modes of the tram DC converter and supercapacitor's current controller.
The article considers the possibilities of saving the regenerative braking energy in Škoda 24Tr type trolleybuses by installing the onboard supercapacitor energy storage system (ESS) and improving its performance with automated switching to the autonomous traction mode. Proposed is an ESS control system with constant DC bus voltage in the supercapacitor charging mode and supercapacitor current proportional to the AC drive current in the discharging mode. The authors investigate stability of the trolleybus ESS control system operating together with AC traction drive in various overhead voltage failure modes. The co-simulation of ESS operation was done by Matlab/Simulink AC drive and PSIM ESS continuous models.
The paper presents configuration of the traction drive test bench with energy storage system, calculation of the scale factors, estimation of the energy storage system size and Matlab simulation results of the bench operation in a braking mode at different levels of the supercapacitor initial voltage.
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.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.