Distributed Maximum Power Point Tracking in Solar Photovoltaic Applications Using Multiphase Switching Converters

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1 Distributed Maximum Power Point Tracking in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck, Robert C. N. Pilawa-Podgurski Power Affiliates Program 2013

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 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 2

3 MPP Tracking in PV Applications Different PV curves for variations in irradiation and temperature Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 3

4 MPP Tracking in PV Applications System architecture determines the level at which MPP tracking is performed. Trade-off between efficiency, reliability and cost Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 4

5 MPP Tracking in PV Applications Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 5

6 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 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 6

7 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 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 7

8 Multiphase dc-dc Converters and Interleaved Operation Parallel multiphase converters are used in high power applications Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 8

9 Multiphase dc-dc Converters and Interleaved Operation Interleaved operation enables significant ripple reduction Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 9

10 Multiphase dc-dc Converters and Interleaved Operation Different input voltages in MPPT application Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 10

11 Multiphase dc-dc Converters and Interleaved Operation Different current ripple magnitude in each phase Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 11

12 Derivation of a New Control Strategy Output low-pass filter attenuates high frequency components. Control needs to effectively minimize low frequency ripple Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 12

13 Derivation of a New Control Strategy Inductor current waveforms with different ripple magnitudes Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 13

14 Derivation of a New Control Strategy time domain frequency domain Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 14

15 Derivation of a New Control Strategy time domain frequency domain Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 15

16 Derivation of a New Control Strategy Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 16

17 Derivation of a New Control Strategy Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 17

18 Derivation of a New Control Strategy Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 18

19 Derivation of a New Control Strategy Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 19

20 Derivation of a New Control Strategy Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 20

21 Performance Verification by Simulation Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 21

22 Performance Verification by Simulation Relative improvement of 43% Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 22

23 Experimental Results Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 23

24 Experimental Results Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 24

25 Experimental Results Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 25

26 Experimental Results Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 26

27 Experimental Results Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 27

28 Experimental Results Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 28

29 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 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 29

30 Thank you! Questions / Discussion Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 30

31 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 Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 31

32 Mathematical Derivations Adjust time/phase shift accordingly Waveform is represented in the frequency domain Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 32

33 Formulation of minimization problem Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 33

34 Formulation of minimization problem Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 34

35 Formulation of minimization problem Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 35

36 Other applications buck converter input current waveforms buck converter output current waveforms Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 36

37 Other applications boost converter input current waveforms boost converter output current waveforms Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 37

38 MPPT Algorithm Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 38

39 Automatic bypass mode detection Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 39

40 Automatic bypass mode detection Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 40

41 Circuits Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 41

42 Circuits Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 42

43 Circuits Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 43

44 Level Shifting Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 44

45 Bypass MOSFET Driver Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 45

46 Efficiency Measurements Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 46

47 Efficiency Measurements Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 47

48 Efficiency Measurements Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 48

49 Field Measurements Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 49

50 Field Measurements Distributed MPPT in Solar Photovoltaic Applications Using Multiphase Switching Converters Marcel Schuck 50