IRJET- VSI based Standalone PV Generation System using Super-Capacitor to Drive Induction Motor

International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 06 Issue: 03 | Mar 2019 www.irjet.net p-ISSN: 2395-0072
© 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 4632
VSI Based Standalone PV Generation System Using Super-capacitor to
Drive Induction Motor
Bhagyashree D. Gadekar1, Rajshree Thakre2
1Dept. Of Electrical Engineering, G.H. Raisoni College of Engineering and Technology Nagpur, Maharashtra, India
2Professor, Dept. Of Electrical Engineering, G.H. Raisoni College of Engineering and Technology Nagpur,
Maharashtra, India
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Abstract - This paper present an efficient topology of
Induction motor drive system by modeling and
simulation with solar panel, DC-DC converter & single
phase inverter. Now a day’s demand of renewable
energy is increasing considerably due to insufficient
electricity, to reduce the use of fissile fuel, and to give
positive contribution in various environmental issues.
Solar energy is widely availableinremote areas;byproperly
using that energy industrial as well as residential load can
be served. This study explains the working of single phase
induction motor using photovoltaic technology with
capacitor bank. The PV system converts solar energy into
electrical energy which is in the form of DC voltage. By
using DC-DC converter that energy is converted into
desirable energy. Inverter is use to transfer that DC voltage
into AC, by controlling sinusoidal pulse width modulation.
The output of the inverter is used to drive induction motor.
By using capacitor bank at the output of the DC-DCChopper
the filtered voltage is applied to the inverter.
Key Words: Photovoltaic System1, DC-DC converter2
Inverter3,CapacitorBank3,InductionMotor4,Induction
Motor5
1. INTRODUCTION
Availability of electricity in developing countries and in
rural areas is non-reliable also globally there are too much
energy crises for that more efficient energy source is
required. Now a days the energy generated from the
renewable sources is very demandable, to fulfill this energy
demand another renewable energy sources like biogas,
wind, hydropower, Photovoltaic system are also
available. The availability of solar energy at remote and
desert area is very high; by properly using this available
solar energy it can be possible to serve various residential
as well as industrial applications. In Industries to drive
various instruments such as fans, blowers, HVAC industrial
drives, automatic control; induction motors are used. Sun is
the biggest source of renewable energy and the energy
generate from that by using photovoltaic system is a clean
energy; having low cost, without noise and without
creating any pollution and it is an efficient way to
produce electricity; these are the reasons it is more
advantageous [1]. In the proposed system energy obtained
from the Sun using photovoltaic system is provided to the
standalone load like Induction Motor. The important
function is to injection of sinusoidal current to the load
with the help of dc/dc converter and dc/ac converter of
sine current injection. In this system energy obtained from
the sun is converted into electrical energy by using
photovoltaic system and provided the output to the
applied standalone load. This paper shows the voltage
source inverter based standalone PV generation system
having simple construction, small size with grate
efficiency, also cost effective because of low operation
and maintenance cost [1]. Photovoltaic system is eco-
friendly and the important feature is that the energy
obtained is nonlinear and time varying due to change in
atmospheric condition for that MPPT technique can be
used for gating maximum power; also maximum power
can be obtained by easily increasing the no of panels in the
system.
Fig -1: Block diagram of standalone PV system
2. PHOTOVOLTAIC MODULE
A photovoltaic module is a collection of no. of PV cell. The
initial cost of those PV cell is high so that it not yet been fully
an attractive alternative for electricity users. The output of a
single PV cell is very low so as to generateuse full power the
cell must be connected in series and parallel configuration.
Series configuration is to increase voltage rating and
parallel configuration is to increase current ratings.
Conversion of sunlight into electrical energy by a solar cell is
called PV effect. The semiconductor device that is PN
junction diode are used to produce photovoltaic cell. The
solar radiation obtained from the sun is in the form of light
energy; the light energy having incident photon, when this

light energy fall on the solar cell it compare with the energy
band gap of the cell if the photon incident or light energy is
greater than that of the band gap an electron hole pair lost
and no current or power can be generate. To prevent this
recombination the carriers are separated by action of the
electric field existing at the P-N junction. Due to electric field
electrons are sweep away from the holes in the conduction
band and goes towards the metal contact. The PV module
consists of no. PV cell. PV module is a linear device and is
usually described by its equivalent circuit diagram and I-V
characteristics.
2.1 A Mathematical Model of Array
A PV cell generator consists of p-n junctions
semiconductor diode, This semiconductor when comes in
contact with the radiations of the Sun it releases a free
electrons which flows as a DC current that is proportional
to the irradiance applied.
Fig -2: Equivalent circuit diagram of PV cell
The circuit module of PV cell consist of series resistance,
shunt resistance, diode and current source. The diode is a P-
N junction diode i.e. PV cell, the leakage current
generated is shown by the shunt resistance (Rp), series
resistance (Rs) shows the resistance due to external
contacts. The solar irradiance, temperature of panel,
operating voltage and current relation gives the output
power of PV system. The physics behind photovoltaicisused
to understand the equivalent circuit of PV cell [1].
The output of the cell is
I = Iph - Id – Ish
Where,
I = Iph – Is [exp (V + IRs)q / akTNs – 1] – V + IRs / Rsh
Iph = Ir (Isc / Iro)
Id = Is [exp (V + Irs / α Vt) -1]
Ish = (V + Irs) / Rsh
Vt = kTNs / q
This expression shows the relation between voltage and
current of photovoltaic cell.
3. DC-DC (BOOST) CONVERTER
The Dc-Dc Converter is used to step up the output from the
PV system, commonly known as boost converter to boost up
the voltage from low level to high level. The average output
voltage of dc-dc converter is alwaysgreaterthanthedcinput
voltage and this dc output voltage is controlled by
controlling the duty cycles of switch. Because of this step up
converter isolation transformer is not required and
controlled output voltage is obtained from uncontrolled
input voltage, by using ON/OFF schemes of the switchesthis
converter is operate on both the mode of charging and
discharging. Boost converter is made up of by using
inductor, high frequency switches like MOSFET, IGBT,
diode and capacitor filter across the load. At the
beginning of the chopper’s operation when MOSFET
which is use as a switch is on, diode becomes reveres
biased and hence no current will flow through the load
and the output stage of the chopper is completely isolate.
During positive trigger pulse switch is on the polarity of
inductor is +ve to –ve and the input current is flowing
through the inductor and switch at that time inductor
stores energy and the direction of current is in loop ;
capacitor and diode is not in working condition. Now
when negative trigger pulse is applied; switch is off and
during this condition diodeisinforwardbiased,outputstage
of chopper receives the energy from the inductor as well as
input supply voltage, energy stored in the inductor start
decreasing and the polarity of inductor change[2]. At this
time supply current and inductor’senergyboth areusedand
diode start to conduct the total current will flow through
load and capacitor, the dc output across the load is the total
voltage of input voltage and voltage across inductor and
hence the output voltage is increased which is always
greater than the input voltage.
Output voltage (VO)
VO = Vs + VL
VO = VS + L di/dt
Average, output voltage (Vavg)
V avg = (VS + VL) (TOFF / TON + TOFF)
ON and OFF period of time can be adjust by using PWM by
changing the width of ON time and OFF time pulse.

Fig -3: Basic configuration of boost converter
4. INVERTER
Inverter is a circuit which converts a dc power into an ac
power at desired output voltage and frequency. The ac
output voltage could be fixed at a fixed or variable
frequency by using BJT, MOSFET, IGBT etc. this conversion
can be achieved either by controlled turn on and turn off
these devices. Based on the nature of input power source
inverters are mainly classified as voltage source inverter
and current source inverter, In voltage source inverter the
input to the inverter provided is a ripple free dc voltage
source, maximum power is drawn through PV system by
using DC-DC converter is applied to the voltage source
inverter which gives high quality of AC outputsupplywhich
is required to drive induction motor. In this the shape ofthe
output voltage waveform is modify by using pulse width
modulation switching scheme. Single phase full bridge
inverter is more advantageous thansinglephasehalfbridge
inverter, main disadvantage of half bridge inverter is that it
required 3 wire dc supply, in full bridge inverter four
switches are used hence the amplitude of output voltage as
well as output power is doubled as compared to half bridge
inverter in this inverter when switch T1,T2 conducts load
voltage is VS and when T3,T4 conducts load voltage is –VS
obtained and frequency of output voltage can be controlled
by varying the periodic time T.
Output voltage (VO)
VO = VS at 0 < t < T/2
VO = -VS at T/2 < t < T
5. VOLTAGE CONTROL SCHEME
There are various output voltage controlled methods for
inverter are available one of them is internal control of
inverter there are two way of doing this method; series
inverter control and pulse width modulation control.
Pulse width modulation is the most efficient method of
controlling the output voltageoftheinverter.Againthere are
various methods of PWM and one of them is multiple
pulse width modulation. In this method harmonic content is
reduced using several pulses in each half cycle of output
voltage. In this a reference signal is compared with a
triangular carrier wave and getting signals are generated
for turning on and off of as witches[3]. This type of
modulation is called as symmetrical pulse widthmodulation
i.e. SPWM.
6. INDUCTION MOTOR
Induction motor is most widely used motor in various
application because of its reliability, induction motor have a
great reliability and also due to its rugged construction
and lower cost. Due to the absence of brushes and slip rings
maintenance cost of this motor are very less. In Industrial
as well as domestic application where AC power is
available for variable speed applications induction motor
are used. The synchronous speed of the induction motor is
given by
Ns = 120f / p where,
F is the frequency of the AC supply, Ns is the synchronous
speed of the motor; P is the number of poles of the motor.
The rotor speed of the motor will change by varying the
frequency of AC supply. In the proposed system frequency
control techniques is used, it is important to maintain v / f
ratio constant in Induction motor If the input voltage of the
motor is change without changing its frequency will causesa
change in flux of motor, if flux is increase the rotor and
stator saturation causes because of that no load current of
the motor will increases. Constant maintaining of flux is only
possible by changing voltage as well as frequency. If voltage
increases then frequency also increases, in this way it is
important to keep the v / f ratio constant[4].
7. SIMULATION RESULT
Fig (1) represented the block diagram of standalone
photovoltaic system the proposed system is verified by
simulation for that MATLAB/SIMULINK software is
used. The designed system consists of a solar panel
interface with power electronics that runs an induction
motor. The main aim of using this software and making of
simulation is to obtain an output using fundamental
components with fewer harmonic. SPWM technique is very
much useful for reduction of harmonics. A PV system
basically consist of number of PV cell, fig (2) shows a circuit
diagram of basic solar cell. One PV cell gives maximum 12 v
supply. In this way by connecting no of cell in series and
parallel a whole panel is formed and the output of
power is almost nearer to 75 v dc after that Dc-Dc converter

is connected in between solar array and inverter of the
system which gives 75v dc to 300v dc[1]. Fig (4) shows
output current characteristics of single PV solar cell and Fig
(5) shows output voltage characteristics of single PV solar
cell. The output of such no. of series and parallel connected
PV cell called as array or simply a solar system is
applied to the induction motor through DC-DC converter
and two level inverter, fig (6) shows main current
characteristics of single phase induction motor , fig (7)
shows capacitor voltage of inductionmotorandfig(8)shows
rotor current characteristics of induction motor, fig (9)
shows torque developed in induction motor, fig (10) shows
speed in rpm of induction motor.
Current
Voltage
Fig -4: I-V Characteristics of solar PV cell
Power
Voltage
Fig -5: P-V Characteristics of solar PV cell
Fig -6: Main current Characteristics of 1Φ induction motor
Fig -7: Capacitor voltage of 1Φ induction motor
Fig -8: Rotor current characteristics of 1Φ induction motor

500
400
300
200
100
Torque 0
(N-m)
-100
-200
-300
-400
-500
1 2 3 4 5
Time (s)
Fig -9: Torque developed in 1Φ induction motor
Speed
200
150
100
50
0
1 2 3 4
Time (sec)
Fig -10: Speed of 1Φ induction motor in RPM
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IRJET- VSI based Standalone PV Generation System using Super-Capacitor to Drive Induction Motor

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