Supercapacitor based energy storage for the use of recuperated energy on metros

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Supervisor:
Dr. Farkas Csaba
Department of Electric Power Engineering

The first metro trains in Budapest were able to brake with their traction motors

in generator operation mode. But the generated electric energy is utilized only on the

new metro cars in the last few years. The new metro trains can recuperate this energy

into the third rail. This process is more efficient during the rush hours, but if only a few

trains run on the metro line it means high waste energy. A possible solution would be

the use of onboard energy storage systems.

In the first part of my BSc thesis I summarised the energy saving technologies in

public transport vehicles of the world. In the second part I estimated the recoverable

kinetic energy in the metro lines M2 and M4 of Budapest. I also carried on simulations

in connection with line M4. I made the model of a possible onboard supercapacitor

energy storage system in MATLAB / Simulink simulation environment. I used the real

measurement data of the Budapest Transport Company as an input of my simulations. I

examined different types of supercapacitor cells with different parameters. As a result I

get a more precise estimation of the possible energy savings using the onboard energy

storage technology.

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