Solar PV System with Grid Interconnections and Inc MPPT Control Harinder Singh

International Journal of Engineering Trends and Technology (IJETT) – Volume 34 Number 8- April 2016
Solar PV System with Grid Interconnections
and Inc MPPT Control
Harinder Singh *; Ankita Rani *; Krishan Arora **
M.Tech Scholar, ** Assistant Professor,
School of Electronics & Electrical Engineering,
Lovely Professional University, Punjab, India
Abstract: Solar PV cells are in field of energy from
capabilities. This technology is good option as due
a long time now. But, in recent years their
to low maintenance requirement , eco-friendly and
utilisation increases rapidly in commercial field or
no pollution and fuel costs. The efficiency of PV
to say commercial aspect. The technology gets its
generation units is low as PV cells are exhibits to
advancement and also the fossil fuels are reducing
non-linear voltage vs. current character tics. Non
day by day so it further enhances their cause of
linearity like panel temperature and solar insolation
using solar power. But still, a lot to do with into
are included [2]. This non linearity’s are used to
this field. Like we have a major obstacle in the
make algorithms and by which PV array give quick
form of detection of maximum power output from a
response & extract the maximum power results into
PV cell. Some techniques of high peak power
efficient operation.
transfer are discussed into the literature for same.
P&O and incremental conductance (I.C) are some
In addition place in places with no alternative
different use, like deserts and roofs, or prove to the
of MPPT techniques are discussed.
Keywords: INC (incremental conductance), PV
electricity done not any network. The latter kind of
array, Simulink model.
installations has understood off-grid facilities and
customarily the foremost economical completely
different to get electricity within the isolated areas.
In present world, as the consumption of power is
Hence, most of the PV power generation takes
increasing day by day. So, research for obtain
place from the grid-connected installations, where
renewable energy is also growing. The energy
facility could feed at intervals electricity network.
obtained from the renewable energy sources are
Actually, it's the expansion of business within the
future energy sources as the fossil fuel are limited.
developed countries like Federal Republic of
A lot of researches are made in past year in
Germany that in 2010 is out and away the world
development and enhancement of power system
leader within the PV current generation which will
which are depends on sea, wind ,solar power etc.
be followed by state, USA, Japan and Italia [3].
Into all of these the sun’s energy is used as most
reliable .another benefit is that this energy is
environment friendly. Although these type of
systems have high initial costs and minimum
The solar power modules can be operated at
efficiency. To overcome these situations PV panels
maximum power they are capable of production.
are used at their maximum power tracking
So, we need some system that may help to track the
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International Journal of Engineering Trends and Technology (IJETT) – Volume 34 Number 8- April 2016
maximum power of a module. This technique is
conversation. This process works as same amount
known as MPPT. Main point of this is that it is a
of power can be exchange by different level of
electronic based system that not physically move
current and voltage. Same technique is used to have
the module like in mechanical tracker. This will
a high current output and battery voltage as a
enhance output electrical power of PV module by
operating level voltage. Until the controller voltage
variation into electrical operating point of system
is higher than battery voltage by 5% or more than
by this mean a additive power is generated which
the output current of array will be higher than
increases battery charge current .we also use MPPT
in addition of some other tracking system .but both
may completely different.
Solar panels has ability to extract most of power
with the help of MPPT. Main principle that is
employed is given as this algorithm will change PV
array operating voltage to battery level voltage and
enhance the output current of system. So, we know
that into this technique there is not any movement
of the PV array. This technique will lower down
the voltage and enhance the current. The output of
the array is stabilized by a process called DC to DC
Figure. 1 : Basic Block Diagram
Basic solar cell equations is given by,
Botlzmann’s constatnt, 1.38*10-19 J/K
S/C current temp coefficient at Iscr
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International Journal of Engineering Trends and Technology (IJETT) – Volume 34 Number 8- April 2016
Electron charge .1.6*10-23 C
Solar irradiation in W/m2
Short circuit current at 250 Celsius
Light – generated current
Band gap for silicon
Ideality factor
Reference temperature
Cell saturation current at Tr
Shunt resistance
Series resistance
Figure 2 : Equivelant PV Cell
high into this method. This may generate
oscillations into output power. The comparison of
The voltage change is taken into consideration by
incremental conductance to array is done if
measuring incremental change of array current and
outcome is same then error signal is zero and point
voltage. This is quite efficient method rather than
is MPP.
P&O but the requirement of computation is quite
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International Journal of Engineering Trends and Technology (IJETT) – Volume 34 Number 8- April 2016
Figure 3: Incremental conductance
The incremental conductance algorithm gives a better tracking efficiency, control over power and very high
response by changing automatically to maximum power point by using the previous power point and by
comparing the value then the power point will automatically shift to that point thereby sensing intelligently and
by the use power electronics now-a-days everything will be done by reducing the losses to a minimal range and
very reliable in operation.
Figure 4: Simulation model of MPPT Array using Incremental Conductance
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International Journal of Engineering Trends and Technology (IJETT) – Volume 34 Number 8- April 2016
Figure 5 : Output of boost converter
In Figure 5, author has seen the fluctuations due to change into the irradiations into the
atmospheric conditions. Response of system can be improved by using some advance MPPT such as the
modified neural MPPT algorithm.
Figure 6 : Output voltage waveform of inverter
From Figure 6, author has observed that voltage reaches to very high value before 0.1 second and
decreases after 0.1 second. At 0.5 second the value again increases and then settles down before 0.6
second. After that the voltage is approximately sinusoidal.
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International Journal of Engineering Trends and Technology (IJETT) – Volume 34 Number 8- April 2016
This work gives approach of using INC technique
to solve MPPT problem into PV array that is
connected to grid. The output of the PV array is
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