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Analysis of the Maximum Power Point Tracking
Simulink Model in a Three-Phase Grid-Connected
Photovoltaic System
Yudie Soeryadharma
Jeen Ming, Ling
ABSTRACT
• Photovoltaic (PV) is one of the clean and freepollution renewable energy, but it is an unreliable
source because of the intermittent feature of
weather.
• Well integration of the MPPT technique with PV
array model will ensure the system operates at its
maximum power point at different weather
conditions and solar irradiation.
• This paper use the MATLAB Simulink to simulate the
model.
INTRODUCTION
• Recently, the needs of renewable energy
resources increase due to the fuel energy crisis
and the global warming issue. Solar energy is one
of the most important renewable energy
• Solar energy using photovoltaic (PV) has several
advantages, e.g., no noise and free pollution.
• Two operational problems, the efficiency is very
low especially under low irradiation conditions
and in the intermittent weather condition the
electric power changes continuously.
• What is MPPT and why it is needed? (Maximum power
point tracking)
It is needed a controller (MPPT) to achieve the highest
efficiency and provide a stable power under the
intermittent weather condition
• Why IC technique ?
It shows good performance under the intermittent of
solar irradiance
The simulation result will show how good is the
performance of this IC technique.
PV Model
• A solar cell basically is a p-n semiconductor
junction. When exposed to light, a dc current
is generated.
PV Characteristic
IC MPPT Technique
• The incremental conductance method is
developed under the fact of slope of the PV
array power curve is zero at the MPP
IC MPPT Algorithm
Block Diagram of the Proposed PV System
AC
PV
ARRAY
BOOST
CONVERTER
DC
DC
PV
INVERTER
V
IC MPPT
CONTROL
I
PV INVERTER
CONTROL
3-PHASE
GRID
SIMULATION SYSTEM
Under mask the system
Simulation under constant solar irradiance
• The maximum standard operating for constant solar irradiance is assumed
to be 1000 W/m2 in the study.
(A) The measured output of PV Module (B) The respond of IC MPPT tracking algorithm
Output from boost converter
Under 1000 W/m2 of solar irradiance, The duty cycle for boost converter is a constant value 0.45 and the
booster convert around 92kW of power with constant ouput voltage 500 V to the PV inverter.
Comparison of the measured output of PV
module with output of boost converter
The PV module provides 100kW and the boost converter convert 92kW of energy
Simulation under decreasing solar irradiance
The figure shows the decreasing solar irradiance (1000 W/m2- 800 W/m2 -250 W/m2).
(A) Decreasing of solar irradiance (B) Duty cycle of boost converter
(A) The measured output of PV Module (B) The respond of IC MPPT tracking algorithm
Output from boost converter
The figure shows the power, voltage, current of boost converter. Under (1000 W/m2- 800 W/m2 250 W/m2) of solar irradiance, the booster convert around 92kW - 80 kW - 25 kW of power. The
booster maintains the output of voltage to be 500 V to the PV inverter.
Comparison of the measured output of PV module with output of boost converter
The PV module provides 100kW (1000 W/m2) 80kW (800W/m2) 25kW (250 W/m2) and the boost
converter convert 92kW, 74kW, 20 kW
Simulation under different solar irradiance
The figure A shows the variations of solar irradiance (600 W/m2- 800 W/m2 - 400 W/m2 -600 W/m2)
Figure B shows the duty cycle of boost converter responding to different solar irradiance.
In fact, an extreme variation of solar irradiance occur rarely.
(A) The measured output of PV Module (B) The respond of IC MPPT tracking algorithm
Output from boost converter
The figure shows the measurement output from boost converter. The figure shows the power,
voltage, current of boost converter. Under (600 W/m2- 800 W/m2 - 400 W/m2 -600 W/m2) of solar
irradiance, the booster maintains output voltage to be 500 V constantly.
Comparison of the measured output of PV module with output of boost converter
The power efficiency is approximately 90%. The simulation result shows the MPPT works and
respond fast and well even in any behavior of solar irradiance and also gain a high efficiency
PV module connected to grid
The simulation is under 1000 W/m2 of solar irradiance.
Output voltage of PV Inverter
Output voltage of load
The figure shows the voltage after connected to the grid. to phase A-B in 25 kV voltage level.
Output voltage of grid
Conclusion
• In this paper, different solar radiations is used to
investigate the performance of IC MPPT.
• Simulation results show the IC MPPT technique in
the PV system achieves the tracking of maximum
power point with acceptable system performance
and fast response.
• For the future, the IC technique will be a reliable
MPPT to apply in the real power system because
of the intermittent of solar irradiance
References
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