ANALYSIS AND SIMULATION OF HARMONICS FOR VARIOUS RESIDENTIAL LOADS USING SIMULINK

NOVATEUR PUBLICATIONS
INTERNATIONAL JOURNAL OF INNOVATIONS IN ENGINEERING RESEARCH AND TECHNOLOGY [IJIERT]
ISSN: 2394-3696
VOLUME 2, ISSUE 8, AUG-2015
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ANALYSIS AND SIMULATION OF HARMONICS FOR
VARIOUS RESIDENTIAL LOADS USING SIMULINK
Yogesh Bhujbal
M.E. Scholar Department of Electrical G.H.I.E.R.T.,
S.F. Pune University, Pune
Prof. Ravindra Joshi
Professor of Electrical Department G.H.I.E.R.T.,
Amol Chate
M.E.Scholar Department of Electrical G.H.I.E.R.T.,
ABSTRACT
Harmonics are the by-products of modern electronic devices i.e. nonlinear loads, this
harmonics by drawing current in abrupt short pulses, rather than in a smooth sinusoidal
manner. Any distribution circuit feeding nonlinear loads will contain some degree of
harmonic frequencies in multiples. Due to the rapidly increasing number of non-linear
loads in distribution systems, the harmonic distortion of the current and voltage
increases. Examples of non-linear loads are personal computer, television set (TV),
fluorescent tube with electronic ballast, compact fluorescent lamp, battery charger,
uninterrupted power supply (UPS) and any other equipment powered by switched-mode
power supply (SMPS) unit. As the number of harmonics-producing loads in residences
has increased over the years, it has become increasingly necessary to address their
effects on the distribution system. Power Quality of distribution networks is severely
affected due to the flow of these generated harmonics. Harmonic currents generated by
nonlinear loads can cause problems on the power system. These harmonics can cause
excessive heat in many appliances, and hence reduce the life span of the distribution
transformer supplying such loads, protecting equipments in power system. It can also
increase power consumption and reduce system efficiency. It also lowers the system
power factor. In this paper presents the results of a SIMULINK of harmonic distortion
caused by different non linear home appliances and analysis of percentage total
harmonic distortion which is found between ranges of 50 to greater than 200.
KEYWORDS: %THD, Non linear load, Matlab-Simulink, FFT tool, Power quality.
INTRODUCTION
Electric utilities are concerned about decreasing power quality and its potential impacts
on the grid. As residential customers add more electronics to the home and replace
existing mechanical switching equipments by electronic switching equipments, there is

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a concern that local grid stability could be compromised. In an effort to determine how
residential power quality (as measured by power factor and total harmonic distortion) is
changing over time, Advanced Energy proposed to survey the current research on
residential power quality and measure actual power quality for two residential homes of
different ages under different load conditions[6][1]. Harmonic distortion is the
distortion of either the voltage or current waveform with the addition of frequencies
other than the fundamental 50 Hertz frequency. Harmonics are generated by non-linear
loads such as computers, battery charging systems, variable frequency drives and other
electronic equipment. Total harmonic distortion indicates the combined impact of all
harmonics upon the fundamental waveform. Since utilities provide a 50 Hertz voltage
source of electricity, the voltage waveform supplied is fairly constant. Various loads on
the grid can, however, impact the current waveform. The primary concern in residential
locations are the third harmonic and other triplens (3rd, 9th, 15th, etc.) harmonics. Each
harmonic exists at a multiple of the fundamental frequency. Many of these harmonics
can cancel each other out. Triplen harmonics, however, are additive and will combine
with each other, as well as the fundamental frequency, to have more deteriorating
impacts.
INTEGRATED SIMULINK MODEL OF RESIDENIAL LOAD
The residential distribution network and the loads were modelled in MATLAB-
Simulink. The model consist three phase residential load at 0.4 kV line voltages then it
split into single phase using neutral. The composed residential network and loads
connected to distribution network. For the purpose of assessing the effect of adding
loads to corresponding harmonic emissions the current distortions at residential load 0.4
kV feeder and voltage distortions at distribution network substation low-voltage
busbars are observed. The number and configuration of residential loads are changed
for different scenarios.
Figure 1: Block Diagram Residential load Harmonic Analysis
Each phase connected to Home1, Home2 and Home3 of Phase A, Phase B and Phase C
respectively with the neutral and get voltage 230V. Below tabular data collected from
FFT Tool of Simulink for Home 1, Home 2, and Home 3.

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Table5: THD% of Voltage and current at Residential Load.
Figure 2: Schematic composed model residential loads in Simulink
THD Home 1 Home2 Home3
Current (%THD) 37.27% 22.84% 23%
Voltage(%THD) 5.06% 2.42% 2.29%

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Table 6: %THD of Voltage and current at 0.4KV Feeder
Figure 2:.Simulated waveform of 0.4KV Feeder
IEEE Standards
International Electro-technical Commission (IEC) is the widely recognized
organization as the curator of electric power quality standards. IEC has introduced a
series of standards, to deal with power quality issues. Integer and inter harmonics are
included in IEC61000 series as one of conducted low-frequency electro-magnetic
phenomena. The series also provides internationally accepted information for the
control of power system harmonic (and inter-harmonic) distortion. The IEEE 519-1992
standard is a widespread alternative to the IEC series (𝐼𝑠𝑐- short circuit current).
Table 7: IEEE 519-1992 standards
𝐼𝑠𝑐 /𝐼𝑙 <11 11 ≤h< 17 ≤h< 23 ≤h< 35 ≤h TDD
<20 4.0 2.0 1.5 0.6 0.3 5.0
20<50 7.0 3.5 2.5 1.0 0.5 8.0
50<100 10.0 4.5 4.0 1.5 0.7 12.0
100<1000 12.0 5.5 5.0 2.0 1.0 15.0
>1000 15.0 7.0 6.0 2.5 1.4 20.0
Total harmonic distortion (THD) Calculation
THDI =
1
i1
irms
2 − i1
2
× 100% (1)
THDV =
1
v1
vrms
2 − v1
2
× 100% (2)
THDTotal = THD2
1 + THD2
2 + THD2
0
× 100% (3)
THD %𝑇𝐻𝐷 𝐴 %𝑇𝐻𝐷 𝐵 %𝑇𝐻𝐷 𝐶
Current 22.84 22.73 33.9
Voltage 2.29 2.42 5.06

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HARMONICS ANALYSIS OF INDIVIDUAL HOME APPLIANCES
Ceiling fan with electronic Regulator
a)
b)
Figure 3: Simulated a) waveform b) FFT of Ceiling fan with electronic regulator
Compact Fluorescent Lamp (11W)
a)
(b)
Figure 4: Simulated a) waveform b) FFT of CFL

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Computer (SMPS)
a)
b)
Figure 5: Simulated a) waveform b) FFT waveform of Computer
Tube Light With Electronic Choke
a)
b)
Figure 6: simulated a) waveform b) FFT waveform of Tube light with electronic
choke

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Battery Charger 24V (Laptop Charger)
a)
b)
Figure 7: Simulated a) waveform b) FFT waveform of Battery charger 24V
Setop Box (SMPS)
a)
b)

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Figure8: Simulated a) waveform b) FFT waveform of SETOP BOX
Television Set (SMPS)
a)
b)
Figure 9: Simulated a) waveform c) FFT waveform of TV
Battery Charger 12V
a)
b)
Figure10: Simulated a) waveform b) FFT waveform of Battery charger 12V

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Compact Fluorescent Lamp
a)
b)
Figure11: Simulated a) waveform c) FFT waveform of CFL 15W
Battery Charger 5 V
a)
b)
Figure12: Simulated a) waveform b) FFT waveform of Battery Charger 5V

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TABLE OF HARMONIC CURRENT VALUES OF SIMULATED
APPLIANCES
CONCLUSION
It is concluded that the harmonic distortion depends upon electronic elements used in
appliance’s circuitry. Here, two personal computers and two mobile phone chargers of
different ‘make’ are considered. It is found that %THDF of computer 1 is 63.39%
whereas as Tube light with electronic choke is 116% i.e. equal to twice. Similarly for
Battery charger 5V, %THDF is found as 102% whereas as CFL 15W, it is 168 %. It can
be inferred that distortion in current waveform not only depends upon the ‘type’ of
nonlinear load but also on the ‘make’ of that load used by the consumer. Percentage
THDF are different because of different circuitry used by the manufacturers. It can also
be concluded from tables that mobile phone chargers are the major sources of %THD.
In present times, every member of a family has a mobile phone of latest technology and
that too of different ‘make’. Numbers of nonlinear residential loads are increasing day
by day; therefore harmonics caused by these loads cannot be neglected. An effect of
harmonics is the overloading of distribution transformer and is main reasons of
premature failure of distribution transformer. When distribution transformers are
installed in India, the State Electricity Boards do not take into account the overloading
due to harmonics caused by residential nonlinear loads.
Appliances
Current
(THD
%)
Harmonic
Order(n)
1 3 5 7 9 11 13 15 17 19 21 23 25
CFL 11w 168.4 Current (%) 100 48 47 46 45 44 43 41 39 38 36 34 27
Computer 63.39 Current (%) 100 45 34 21 10 1 3 5 2 0 1 1 1
Tube Light With
Electronic Choke
116.86 Current (%) 100 29 23 15 7 3 8 12 14 14 12 10 8
Ceiling Fan 23.50 Current (%) 100 17 12 6 2 2 3 3 2 2 1 0 0
Battery Charger
24V
84 Current (%) 100 66 44 58 61 17 8 9 9 5 3 3 1
Setop Box 35.44 Current (%) 100 20 17 15 12 9 5 3 1 1 1 1 0
Television Set 103 Current (%) 100 51 47 43 37 31 25 19 13 9 5 2 1
Battery Charger
12v
43 Current (%) 100 41 6 8 4 2 2 0 1 0 0 0 0
CFL 15w 167 Current (%) 100 94 85 72 57 42 27 14 3 7 8 7 5
Battery Charger
5v
102 Current (%) 100 53 34 17 15 17 11 20 32 37 37 35 26

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FUTURE WORK
Produced harmonics due to residential loads should be minimizing. There are many
techniques to reduce harmonics but economic and maintenance points of view there
have necessity to select best compensation method.
REFERENCES
[1] A. B. Vasconcellos, Dr., M. S. C. de Carvalho, Acad., J. R. de Carvalho, Acad., A. M.
Coimbra, Acad., R. C. F. Gregory., Acad.; Raul V. A. Monteiro “Energy Efficiency and
Harmonic Distortion in Automation of Air Conditioning” ©2014 IEEE.
[2] Arnulfo B. de Vasconcellos, Dr., Marina S. C. de Carvalho, Acad., Andrei M. Coimbra,
Acad., Jéssica R. de Carvalho, Acad., Raul V. A. Monteiro, Esp. “Analysis of Tuned
Filters for Mitigation of Harmonic Current Distortion of Air Conditioning Systems to
Inverter” 2014 IEEE
[3] J. Niitsoo, I. Palu, J. Kilter, P. Taklaja, T. Vaimann. “Residential Load Harmonics in
Distribution Grid” 3rd International Conference on Electric Power and Energy
Conversion Systems, Yildiz Technical University, Istanbul, Turkey, October 2-4, 2013
IEEE.
[4] MOK Yan, Kit, TSE C.F. Norman, LAU W.H. “A Study on the Effects of Voltage
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[5] Agus Purwadi, Nana Heryana, Dadan Nurafiat “ A Study of Harmonic Impacts on High
Voltage, Medium Voltage and Low Voltage Networks in PT. PLN Distribution System”
, Indonesia ©2011 IEEE.
[6] Khodijah Mohamed,Hussain Shareef, Azah Mohamed Malaysia. “Analysis of
Harmonic Emission from Dimmable Compact Fluorescent Lamps” International
Conference on Electrical Engineering and Informatics 17-19 July 2011, Bandung,
Indonesia ©2011 IEEE.
[7] Ranjana Singh, Amarjit Singh “Energy Loss Due to Harmonics in Residential Campus
– A Case Study. UPEC2010 31st Aug - 3rd Sept IEEE 2010.
[8] Jing Yong, Member, IEEE, Liang Chen, and Shuangyan Chen “Modeling of Home
Appliances for Power Distribution System Harmonic Analysis” IEEE Transactions On
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[9] V. KatiC*, B. DumniC*, S. Mujovic", J.RadoviC*** “Effects of Low Power
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