The use of Photovoltaic (PV) systems is increasing rapidly due to its various advantages. The performance of PV system depends upon in plane radiation and temperature. A PV module is designed in MA TLAB-SIMULlNK using the S-function builder and controlled current source. The proposed PV module enables us to obtain its P-V and I-V characteristics at different temperature and radiations. The main disadvantage of the PV system is its variable voltage. To obtain the stable voltage, the different DC-DC converters are connected with the PV modules. An intermediate dc-dc converter can increase efficiency of the system by providing impedance match between PV system and load. This paper presents the design and simulation of DC-DC converters. In this paper, Boost converter, cascaded Buck Boost, Cuk converter and Single ended primary inductance converter (SEPIC) are modeled in MATLAB and their results are compared.

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