In this work, implementation of supercapacitor powered electric city bus based mass transit system (Capabus) in Guwahati city has been analysed. Vanadium Redox Batteries (VRBs) are placed at the bus stops and the charging of the super capacitors is done via VRBs whenever a bus stops at the bus stop. The capabuses will be used on a ring road for transportation in Guwahati city. A 33kV or 11kV power line is used to charge these VRBs during off peak hours of the grid. Besides transportation (which will be eco-friendly), these VRBs would also be used to support the grid during peak hours. Hence, Capabus will work in harmony with the distribution network of the city and will serve two purposes: transportation of people and the grid support. In this paper, analysis of implementing the Capabuses and their utilization for the grid support is demonstrated.Index Terms-Capabus, Super capacitors, Vehicle to Grid, Vanadium Redox Battery (VRB).
A new model to manage the energy flow between the grid and the Electric Vehicles (EVs) has been proposed. This model will be very useful in the near future as the numbers of EVs in the market are increasing at a very rapid pace. EVs' charging station (CS) will be connected to some of the nodes of the power distribution network. EVs of a particular area will arrive at the CS connected to the local distribution node to charge their batteries. Apart from serving the EVs (charging), CSs will also be used to provide grid stabilization services like peak shaving, valley filling and voltage regulation. There will be a fuzzy logic controller between the charging station and the distribution node which will control the flow of energy to/from the EVs. The division of the power among the EVs' batteries will be achieved by using a suitably designed aggregator. Moreover, the batteries will not be charged/discharged beyond the charging/discharging rate C rate limit fixed by the EVs owners and also the batteries will not be discharged beyond the state of charge limit.
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