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Grid Connected wind Farm and Power Quality issues
1
K.V.Bhadane, 2M.S.Ballal, 3R.M.Moharil
1
Phd Research Scholar, RTM Nagpur, M.S.-India,[email protected]
2
RTM Nagpur, M.S.-India, 3 RTM Nagpur, M.S.-India

India, the leading state is Maharashtra and the development
Abstract-- In Maharashtra, the heavy penetration level
rate of the same is quite good but as per the Vision 2020, the
of grid connected wind energy has been used and due to
mandatory aspect is Electrical Power. In Maharashtra, the
this, the power quality of electric power system gets
requirement of Electric power is more than availability.
affected. This paper is described the Power Quality
Hence the load shedding is a temporary solution is applied
Disturbance Analysis of Grid Connected Wind Energy
to the utility. Now , we have to used the more renewable
by using wavelet Transform. The effect of wind speed on
energy sources and try to contribute something for the nation
power quality of grid connected wind energy of a case
in term of electric power awareness.[1] The interest in
study system has been described. due to increased the
renewable energy is a global trend, which will become even
number of grid connected Induction generators, the
important
requirement of reactive power is increased, voltage level
depletion/exhausting of fossil fuel based energy sources. In
is decreased and system power factor get decreased.
the effort to mitigate climate change through the reduction
in
the
future
due
to
the
expected
of emission of greenhouse gases, many countries promote
This paper shows that, how the different power
renewable energy. Recent examples includes the directive
quality disturbances are identify by using wavelet
which targets a 20% contribution of renewable energy
transform and their analysis is explained. This paper is
sources to the total energy consumption by 2020 & plans
described the impact of different wind speed on different
from the new MNRE guidelines to focus more on renewable
power quality issues of grid connected wind energy. The
energy. A very popular source of renewable energy is Wind
Energy losses due to power quality disturbance of grid
Energy.[1] Due to fast rise in Industrialization, Information
connected wind energy are concluded.
Technology sector and development in retail sector,
electrical power requirements have increased significantly.
Index Terms-- Wind Farm, Wavelet Transform, power
There is large gap between supply side and load side
quality, grid system, wind speed and penetration, active
demand.
& reactive power, PQ issues, etc.
(renewable sources) can play an important role to overcome
In
this
situation
alternate
energy
sources
this electric power gap. Out of many alternate sources for
I. INTRODUCTION
Wavelet transform is a recent signal processing tool
generation of electricity, wind energy is the most
promising.[2] Renewable Energy Source (RES) integrated at
which is widely being used for disturbance detection in PQ.
distribution
The WT approach prepares a window that automatically
Generation(DG).The utility is concerned due to the high
adjusts to give proper resolutions of both the time and the
penetration level of wind energy in distribution systems, as it
frequency. The WT well suited for the analysis of the power
may pose a threat to network is terms of Power Quality(PQ)
system transients caused by various PQ disturbances. In
issues , voltage regulation and stability. Therefore the DG
level
is
termed
as
Distributed
systems are required to comply with strict technical and
regularity frameworks to ensure safe, reliable and efficient
2
operation of overall network. Wind energy system
III. SYSTEM DESCRIPTION
integration issues and associated PQ problems are
discussed.[3] Electrical Power Quality is the degree of any
Wavelet transform is a recent signal processing tool which is
deviation from the nominal values of the voltage magnitude
widely being used for disturbance detection in PQ. The WT
and frequency.“Power Quality” is a term used to describe
approach prepares a window that automatically adjusts to
the most important aspect of the electricity supply.[4] Any
give proper resolutions of both the time and the
disturbance in the voltage, current or frequency of the power
frequency.[30-32]
signal that can adversely affect the customer’s equipment
Wavelets, little wave like functions, are used to transform
can be termed as a power quality problem. [5] Power
the signal under investigation into another representation
Quality has become very important issue over the last
which presents the signal information in a more useful form.
decade. A key reason for the increasing importance is the
This transformation of the signal is known as the Wavelet
rapid spread of the use of equipments sensitive to power
Transform. WT.[33-39]
system disturbances and the widespread use of non-linearly
Multi Resolution Analysis (MRA);
behaving power electronic converters.[6] The addition of
1) Voltage Sag:
wind Turbines can have a significant effect and increases the
complexity of this problem. Depending on the grid
configuration and the type of wind turbine used, Power
Quality has become very important issue over the last
decade. A key reason for the increasing importance is the
rapid spread of the use of equipments sensitive to power
system disturbances and the widespread use of non-linearly
behaving power electronic converters.[6] The addition of
wind Turbines can have a significant effect and increases the
complexity of this problem. Depending on the grid
configuration and the type of wind turbine used,
II. SYSTEM DESCRIPTION
The goal of this study is to examine the Power Quality
behavior of the network in case of integration of different
amounts of wind energy at different locations of the
transmission system. In order to analyses the impact of wind
energy integration on the networks power quality , a 220 KV
transmission system with MV & LV subsystems is
studied.[5-6] Integrated wind farm is used and power quality
analysis is performed. The integration of big wind farm
creates new problems of power quality. Hence there is scope
for study of said area [7-29].
2) Voltage Swell:
3
3) Harmonics:
IV. POWER QUALITY ANALYSIS-CASE STUDY
THD OF VOLTAGE & CURRENT
4) Notching:
4
observed that, the simultaneously switching operation of
induction generators results in to excessive inrush of
reactive power from the grid, which is undesirable.
Reactive
power
consumption increases with
increase in number of grid connected induction generators in
the circuit. Hence there is need to compensate this effect in
THDV = (100- Energy of A7 band ) x 100 % = (10089.32)x100% = 10.68%
THDV= 1) 10.68% 2) 3.35% 3) 2.02% 4) 0.17%
THD OF CURRENT:
case number of induction machines increases. There is
increase in total harmonics distortion (current) with number
of grid connected induction generators increases in the
circuit.
THDI = (100- Energy of A7 band ) x 100 % = (10090.68)x100% = 9.32%[40-45]
Grid connection of renewable energy sources is
essential if they are to be effectively exploited, but grid
connection brings problems of voltage fluctuations and
harmonic distortion. Active power control will play an
important role during the normal conditions.
VI. ACKNOWLEDGEMENTS
The authors would like to thank Hon. Mr. Sunil
Raisoni, Chairman, RGI, Nagpur. , Hon. Pritam Raisoni,
Executive Director, RGI, Jalgaon , Hon. Dr.Prabhakar Bhat,
Principal, G.H.Raisoni Institute of Engineering
and
Management , Jalgaon for their strong support and
encouragement during the research work.
VII. REFERENCES
THDI > 1) 0.76% 2) 2.44% 3) 9.99%
As per the modeling and simulation of a case study, the
power quality of the grid connected wind farm has been
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