Post on 12-Jul-2020
Distributed Maximum Power Point Tracking in Solar Photovoltaic Applications Using
Multiphase Switching Converters
Marcel Schuck, Robert C. N. Pilawa-Podgurski mschuck2@illinois.edu
Power Affiliates Program 2013
16.06.2015 | Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters | Marcel Schuck | 2
Table of contents
• Maximum Power Point (MPP) Tracking in Solar Photovoltaic
(PV) Applications
• Multiphase dc-dc Converters and Interleaved Operation
• Derivation of a New Control Strategy
• Performance Verification by Simulation
• Experimental Results
• Conclusions
• Questions/Discussion
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MPP Tracking in PV Applications • Different PV curves for variations in irradiation and temperature.
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MPP Tracking in PV Applications • System architecture determines the level at which MPP tracking
is performed. • Trade-off between efficiency, reliability and cost.
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MPP Tracking in PV Applications
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MPP Tracking in PV Applications • Shaded sub-module is bypassed and does not contribute to
energy production. • MPP tracking at the sub-module level increases power yield.
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MPP Tracking in PV Applications
• Dc-optimizer solution • No need to perform voltage step-up at the sub-module level • High efficiency, low cost implementation is possible • Can be used with a central inverter
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Multiphase dc-dc Converters and Interleaved Operation
• Parallel multiphase converters are used in high power applications.
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Multiphase dc-dc Converters and Interleaved Operation • Interleaved operation enables significant ripple reduction.
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Multiphase dc-dc Converters and Interleaved Operation • Different input voltages in MPPT application
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Multiphase dc-dc Converters and Interleaved Operation • Different current ripple magnitude in each phase
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Derivation of a New Control Strategy • Output low-pass filter attenuates high frequency components. • Control needs to effectively minimize low frequency ripple.
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Derivation of a New Control Strategy • Inductor current waveforms with different ripple magnitudes
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Derivation of a New Control Strategy
time domain frequency domain
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Derivation of a New Control Strategy
time domain frequency domain
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Derivation of a New Control Strategy
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Derivation of a New Control Strategy
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Derivation of a New Control Strategy
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Derivation of a New Control Strategy
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Derivation of a New Control Strategy
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Performance Verification by Simulation
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Performance Verification by Simulation
• Relative improvement of 43%
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Experimental Results
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Experimental Results
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Experimental Results
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Experimental Results
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Experimental Results
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Experimental Results
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Conclusions
• MPP tracking on the sub-module level increases power yield under mismatched conditions.
• Converters can efficiently be implemented with a multiphase topology.
• Control strategy that enables improved ripple cancellation for multiphase converters with asymmetric operating conditions has been presented.
• Its performance was verified by simulations and experimantal results.
• Calculation of uneven phase angles based on the frequency domain representation of the current waveforms goes beyond the previous works in the field.
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Thank you !
Questions / Discussion
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Mathematical Derivations – for N phases
• Shift phasors with similar magnitudes by 180° • Apply for N-2 phasors with the largest magnitudes • Apply proposed technique with the summed and the remaining
phasors
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Mathematical Derivations • Adjust time/phase shift accordingly • Waveform is represented in the frequency domain
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Formulation of minimization problem
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Formulation of minimization problem
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Formulation of minimization problem
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Other applications
buck converter input current waveforms buck converter output current waveforms
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Other applications
boost converter input current waveforms boost converter output current waveforms
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MPPT Algorithm
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Automatic bypass mode detection
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Automatic bypass mode detection
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Circuits
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Circuits
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Circuits
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Level Shifting
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Bypass MOSFET Driver
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Efficiency Measurements
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Efficiency Measurements
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Efficiency Measurements
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Field Measurements
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Field Measurements