Abstract—More PMSG also vary. This output voltage

Abstract—More than 50 percent of electric energyproduced in India is from fossil fuel (Coal & Oil). Storage of fossil fuelshas started depleting. These types of energy sources have also created anenvironmental pollution. In this circumstances wind energy has emerged analternate form of energy source.

This paper presents the modelling andperformance analysis of wind energy systems in SIMULINK environment.Wind energy system comprises Wind Turbine, Permanent Magnet SynchronousGenerator (PMSG), buck converter and battery. Wind speed varies withtime, so output voltage of PMSG also vary. This outputvoltage is rectified by diode rectifier and step down the voltage bybuck converter to the required level. A SIMULINK model isdesigned for the standalone system in this paper.Keywords—PMSG Wind Turbine  Buck converter  Battery .                                                                                                                                                     I.

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      Introduction Energyhas a great role in the development of any country. All industry,transportation, services are totally dependent on the energy. Due to this ahuge amount of fossil fuel has utilized. In India more than 70 percent energy has generated by thecoal, oil and gases. Burning of fossil fuel also create an air pollution,temperature rise due to which glacier melt, greenhouse effect etc. In thisscenario an alternate source of energy required which solve the above problems.Renewable energy sources like Solar, Wind, Geothermal, Tidal etc.

have greatimportance. In above renewable energy resources some are specific for aparticular place such as Geothermal and Tidal. Both sources are only forseashores areas.

But Wind and Solar are used everywhere. Wind energysystems generate energy by converting kinetic energy of turbine blade intoelectrical energy through generator.Doublyfed induction generator (DFIG) and permanent magnet synchronous generator (PMSG) are suitable for wind power generation.1,2 Since PMSG are self-excited, so it is more popular in windenergy generation systems. Also, as like DFIG it doesn’t require anyseparate DC supply and field coils.

Absence of field windings, brushes, sliprings, gear-box, it has less weight, low maintenance and less losses and more efficient.Windprofile of a particular location is unpredictable.  Due to change in wind speed,turbine rotor speed also changes and power produced by generator also varies.

In this case maximum power can be tracked, when turbine rotorspeed varies in accordance with the change in speed of turbine.Thereare some regions in many country, where grid connection didn’t reach due to itsisolated situation or geographical situations. In that regions distributedenergy is used as the source of energy.

In that regions if windspeed profile is good than standalone wind energy system is used.                                                                                                                                                II.    ProposedSystemThe system consists of Wind turbine (WT), PMSG,uncontrolled diode rectifier, buck converter, battery, and dc load. The Windturbine is directly coupled to PMSG. A diode bridge rectifier connected to theoutput of PMSG. It converts the output of PMSG into dc. Then there is a buckconverter, where MPPT algorithm has to be implemented.

The whole system isparallel connected to dc load and battery. Fig. 1 shows the proposed system.

Themodelling of a wind turbine can be subdivided in several sub-models as shown inFig. 2 This includes the aerodynamic model, drive train model and generatormodel. 

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