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This study presents a control strategy for interconnection of a cluster of direct current (DC) microgrids operating at different grid voltages in islanded mode. In this study, two neighbouring DC microgrids (DCMGs) are interconnected through a bidirectional DC-DC converter (BDC) and DC cable. The BDC has been placed near to the low-voltage DCMG. The DCMGs consist of wind turbines, solar-photovoltaic systems, solid oxide fuel cell, micro-turbine generators, battery energy storage systems and varying DC and three-phase as well as single-phase alternating current loads. The proposed control strategy of the BDC is aimed at managing the bidirectional flow of power between the DCMGs to balance the power under various operating scenarios and fault conditions, while maintaining constant DC voltages of both the DCMGs. Simulations are carried out to verify the robustness of the proposed control strategy under different operating conditions including fault scenario.

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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).

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