what is mppt and why it is needed? (maximum power point tracking)
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
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• 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.
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PV Model• A solar cell basically is a p-n semiconductor
junction. When exposed to light, a dc current is generated.
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PV Characteristic
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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
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Block Diagram of the Proposed PV System
PV ARRAY
BOOSTCONVERTER
PVINVERTER
3-PHASEGRID
IC MPPT CONTROL
I
V
PV INVERTERCONTROL
AC
DCDC
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SIMULATION SYSTEM
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Under mask the system
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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
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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.
Output from boost converter
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The PV module provides 100kW and the boost converter convert 92kW of energy
Comparison of the measured output of PV module with output of boost converter
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Simulation under decreasing solar irradiance
(A) Decreasing of solar irradiance (B) Duty cycle of boost converter
The figure shows the decreasing solar irradiance (1000 W/m2- 800 W/m2 -250 W/m2).
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(A) The measured output of PV Module (B) The respond of IC MPPT tracking algorithm
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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.
Output from boost converter
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The PV module provides 100kW (1000 W/m2) 80kW (800W/m2) 25kW (250 W/m2) and the boost converter convert 92kW, 74kW, 20 kW
Comparison of the measured output of PV module with output of boost converter
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Simulation under different solar irradiance
Figure B shows the duty cycle of boost converter responding to different solar irradiance. In fact, an extreme variation of solar irradiance occur rarely.
The figure A shows the variations of solar irradiance (600 W/m2- 800 W/m2 - 400 W/m2 -600 W/m2)
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(A) The measured output of PV Module (B) The respond of IC MPPT tracking algorithm
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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.
Output from boost converter
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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
Comparison of the measured output of PV module with output of boost converter
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PV module connected to gridThe simulation is under 1000 W/m2 of solar irradiance.
Output voltage of PV Inverter
Output voltage of load
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The figure shows the voltage after connected to the grid. to phase A-B in 25 kV voltage level.
Output voltage of grid