  With the increasing adoption of renewable energy sources by domestic users,
decentralisation of the grid is fast becoming a reality. Distributed generation
is an important part of a decentralised grid. This approach employs several
small-scale technologies to produce electrical energy close to the end users or
consumers. The higher reliability of these systems proves to be of advantage
when compared to traditional generation systems. Multi-Input Converters (MICs)
perform a decisive function in Distributed Energy Resources (DERs). Making use
of such MICs prove to be beneficial in terms of size, cost, number of
components used, efficiency and reliability as compared to using several
independent converters. This thesis proposes a double input DC-DC converter
which makes use of a quasi Y-source converter in tandem with a boost converter.
The quasi Y-source converter has the advantage of having a very high gain for
low duty cycles. The associated operating modes are analysed and the operation
of the MIC is verified using simulation result. A hardware prototype is built
for large signal analysis in open loop. Different loads are applied and the
efficiency of the MIC as a whole as well as the load sharing between the
different sources is investigated.
