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
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 16.06.2015 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 2
MPP Tracking in PV Applications Different PV curves for variations in irradiation and temperature. 16.06.2015 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 3
MPP Tracking in PV Applications System architecture determines the level at which MPP tracking is performed. Trade-off between efficiency, reliability and cost. 16.06.2015 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 4
MPP Tracking in PV Applications 16.06.2015 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 5
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. 16.06.2015 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 6
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 16.06.2015 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 7
Multiphase dc-dc Converters and Interleaved Operation Parallel multiphase converters are used in high power applications. 16.06.2015 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 8
Multiphase dc-dc Converters and Interleaved Operation Interleaved operation enables significant ripple reduction. 16.06.2015 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 9
Multiphase dc-dc Converters and Interleaved Operation Different input voltages in MPPT application 16.06.2015 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 10
Multiphase dc-dc Converters and Interleaved Operation Different current ripple magnitude in each phase 16.06.2015 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 11
Derivation of a New Control Strategy Output low-pass filter attenuates high frequency components. Control needs to effectively minimize low frequency ripple. 16.06.2015 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 12
Derivation of a New Control Strategy Inductor current waveforms with different ripple magnitudes 16.06.2015 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 13
Derivation of a New Control Strategy time domain frequency domain 16.06.2015 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 14
Derivation of a New Control Strategy time domain frequency domain 16.06.2015 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 15
Derivation of a New Control Strategy 16.06.2015 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 16
Derivation of a New Control Strategy 16.06.2015 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 17
Derivation of a New Control Strategy 16.06.2015 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 18
Derivation of a New Control Strategy 16.06.2015 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 19
Derivation of a New Control Strategy 16.06.2015 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 20
Performance Verification by Simulation 16.06.2015 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 21
Performance Verification by Simulation Relative improvement of 43% 16.06.2015 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 22
Experimental Results 16.06.2015 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 23
Experimental Results 16.06.2015 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 24
Experimental Results 16.06.2015 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 25
Experimental Results 16.06.2015 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 26
Experimental Results 16.06.2015 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 27
Experimental Results 16.06.2015 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 28
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. 16.06.2015 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 29
Thank you! Questions / Discussion 16.06.2015 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 30
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 16.06.2015 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 31
Mathematical Derivations Adjust time/phase shift accordingly Waveform is represented in the frequency domain 16.06.2015 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 32
Formulation of minimization problem 16.06.2015 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 33
Formulation of minimization problem 16.06.2015 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 34
Formulation of minimization problem 16.06.2015 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 35
Other applications buck converter input current waveforms buck converter output current waveforms 16.06.2015 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 36
Other applications boost converter input current waveforms boost converter output current waveforms 16.06.2015 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 37
MPPT Algorithm 16.06.2015 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 38
Automatic bypass mode detection 16.06.2015 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 39
Automatic bypass mode detection 16.06.2015 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 40
Circuits 16.06.2015 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 41
Circuits 16.06.2015 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 42
Circuits 16.06.2015 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 43
Level Shifting 16.06.2015 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 44
Bypass MOSFET Driver 16.06.2015 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 45
Efficiency Measurements 16.06.2015 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 46
Efficiency Measurements 16.06.2015 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 47
Efficiency Measurements 16.06.2015 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 48
Field Measurements 16.06.2015 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 49
Field Measurements 16.06.2015 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 50