An Integrated Inverter Structure for Grid Connected PV System with Maximum Power Point Tracking
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Date
2015
Authors
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Journal ISSN
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Publisher
MPUAT, Udaipur
Abstract
The exhaustion of fossil fuel has necessitated an urgent requirement in supplying the
world’s required power demands. The photovoltaic power generation system keeps
growing in the last few decades to produce promising source of energy. In most
parts of the world solar energy is so enormous and free has become economical
source of energy in many applications. Compared with other renewable
technologies, the PV conversion system still facing major obstacle to widespread
due to low efficiency and high cost. Due to fluctuation in output power of PV
systems, it reduces the reliability to provide continuous power to utility. Due to
variance in solar irradiance, the fluctuations in the output power may create
undesirable performance of the utility grid. However the researchers are working to
overcome the aforementioned obstacles and enhance the PV technology.
An integrated inverter structure for grid-connected PV system with MPPT is
presented and discussed in this Thesis. The proposed inverter integrates mainly three
functions optimal power point tracking, dc side buck-boost voltage and gridconnected
current output. By varying the power factor, within a certain range, the
injected reactive power can be dynamically changed and controlled. The grid
connected integrated inverter PV system supplies active power as well as provides
harmonic and reactive power compensation. This additional feature of Integrated PV
inverter increases the effective utilization and also the overall efficiency of the system.
Different MPPT algorithms like P&O and fuzzy logic control are able to extract
optimal power from solar array have been discussed and compared. These
algorithms include new original approaches and developments. The main goal was
to control active power, compensate reactive power and mitigate the harmonic
distortion by injecting the pure sinusoidal current to the utility grid.
An integrated inverter control method based on shunt active filter has been
discussed. By application of Shunt Active Filter scheme the three main goal active
power generation, reactive power compensation and harmonic elimination is
achieved. The proposed control system used instantaneous reactive power theory and space vector modulation based hysteresis current controller for the Generation
of reference current and gating signal to each phase of the inverter which gives
precise and quick response.
Simulation and experimental investigation always followed theoretical
developments. MATLAB/SIMULINK environment has been used for the
simulation, whereas the developed hardware laboratory prototype of proposed 200
W P&O based PV system is carried out to validate the developed system and its
MPPT control under different conditions. The proposed inverter gives better
performance characteristics and inversion efficiency compared to the conventional
solution. The complete research work has been done at the Lab of the Department of
Electrical Engineering, College of technology and Engineering, Udaipur
(Rajasthan), India.
Description
An Integrated Inverter Structure for Grid
Connected PV System with Maximum Power Point Tracking
Keywords
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Citation
Priyadarshi and Joshi, 2015