Abstract—More PMSG also vary. This output voltage

Abstract—More than 50 percent of electric energy
produced in India is from fossil fuel (Coal & Oil). Storage of fossil fuels
has started depleting. These types of energy sources have also created an
environmental pollution. In this circumstances wind energy has emerged an
alternate form of energy source. This paper presents the modelling and
performance analysis of wind energy systems in SIMULINK environment.
Wind energy system comprises Wind Turbine, Permanent Magnet Synchronous
Generator (PMSG), buck converter and battery. Wind speed varies with
time, so output voltage of PMSG also vary. This output
voltage is rectified by diode rectifier and step down the voltage by
buck converter to the required level. A SIMULINK model is
designed for the standalone system in this paper.

Keywords—PMSG
 Wind Turbine  Buck converter  Battery .

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I.      Introduction

Energy
has a great role in the development of any country. All industry,
transportation, services are totally dependent on the energy. Due to this a
huge amount of fossil fuel has utilized. In India more than 70 percent energy has generated by the
coal, oil and gases. Burning of fossil fuel also create an air pollution,
temperature rise due to which glacier melt, greenhouse effect etc. In this
scenario an alternate source of energy required which solve the above problems.
Renewable energy sources like Solar, Wind, Geothermal, Tidal etc. have great
importance. In above renewable energy resources some are specific for a
particular place such as Geothermal and Tidal. Both sources are only for
seashores areas. But Wind and Solar are used everywhere. Wind energy
systems generate energy by converting kinetic energy of turbine blade into
electrical energy through generator.

Doubly
fed 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 wind
energy generation systems. Also, as like DFIG it doesn’t require any
separate DC supply and field coils. Absence of field windings, brushes, slip
rings, gear-box, it has less weight, low maintenance and less losses and more efficient.

Wind
profile 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 rotor
speed varies in accordance with the change in speed of turbine.

There
are some regions in many country, where grid connection didn’t reach due to its
isolated situation or geographical situations. In that regions distributed
energy is used as the source of energy. In that regions if wind
speed profile is good than standalone wind energy system is used.

                                                                                                                                                
II.    Proposed
System

The system consists of Wind turbine (WT), PMSG,
uncontrolled diode rectifier, buck converter, battery, and dc load. The Wind
turbine is directly coupled to PMSG. A diode bridge rectifier connected to the
output of PMSG. It converts the output of PMSG into dc. Then there is a buck
converter, where MPPT algorithm has to be implemented. The whole system is
parallel connected to dc load and battery. Fig. 1 shows the proposed system. The
modelling of a wind turbine can be subdivided in several sub-models as shown in
Fig. 2 This includes the aerodynamic model, drive train model and generator
model.