Abstract

The technology involved in the generation of power from renewable sources like solar and wind in small\nscale and large scale is developing at a very faster rate due to increased concern over environmental pollution and\nenergy crisis across the globe. As the generated power is highly fluctuating due to variation in wind speed and the load\ncoming on is highly dynamic, the prime importance of power converters in wind energy conversion system is to\nmaintain constant voltage across the DC bus irrespective of changes in either wind speed and changes in load. Also to\nmaintain the reliability and power quality of the distributed generation system, the power converter should be operated\nwith enhanced efficiency and less voltage ripple and current ripple. Different dc-dc converters are in use, in this paper an\nattempt is made to evaluate and compare the performance parameters of non- isolated DC-DC converters viz..buck,\nBuck Boost, Cuk Single Ended Primary Inductance Converter and Zeta converter. This paper includes dynamic\nmodelling and simulation of wind turbine at optimum wind speed of 10m/s along with the modelling and simulation of\nmentioned dc-dc converters tapping unregulated voltage from wind turbine system. Their performance parameters are\nanalysed for parameters like input ripple current, output current ripple, switch stress, switch utilization factor, efficiency\nat different wind speeds and compared to select a better topology. The complete system considering each converter\nindividually is simulated in MATLAB/SIMULINK platform. The tabulated results shows that SEPIC converter has\nbetter performance parameters over other types with an highest efficiency of 92.4% and a voltage ripple of 2%.