Browse > Article
http://dx.doi.org/10.6113/JPE.2019.19.4.1011

Buck-Flyback (fly-buck) Stand-Alone Photovoltaic System for Charge Balancing with Differential Power Processor Circuit  

Lee, Chun-Gu (Department of Electrical Engineering, Soongsil University)
Park, Jung-Hyun (Department of Electrical Engineering, Soongsil University)
Park, Joung-Hu (Department of Electrical Engineering, Soongsil University)
Publication Information
Journal of Power Electronics / v.19, no.4, 2019 , pp. 1011-1019 More about this Journal
Abstract
In this paper, a buck-flyback (fly-buck) stand-alone photovoltaic (PV) system for charge balancing with a differential power processor (DPP) circuit is proposed. Conventional feed-back DPP converters draw differential feed-back power from the output of a string converter. Therefore, the power is always through the switches and diodes of the string converter. Because of the returning conduction path, there are always power losses due to the resistance of the switch and the forward voltage of the diode. Meanwhile, the proposed feed-back DPP converter draws power from the magnetically-coupled inductor in a string converter. This shortens the power path of the DPP converter, which reduces the power losses. In addition, the extra winding in the magnetically-coupled inductor works as a charge balancer for battery-stacked stand-alone PV systems. The proposed system, which uses a single magnetically-coupled inductor, can control each of the PV modules independently to track the maximum power point. Thus, it can overcome the power loss due to the power path. It can also achieve charge balancing for each of the battery modules. The proposed topology is analyzed and verified using 120W hardware experiments.
Keywords
Buck-flyback; Charge balancing; Differential power processor; Fly-buck converter; Forward converter; Photovoltaic applications;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
1 S.-J. Park, J.-H. Shin, J.-H. Park, and H.-J. Jeon, “Dynamic analysis and controller design for standalone operation of photovoltaic power conditioners with energy storage,” J. Elect. Eng. Technol., Vol. 9, No. 6, pp. 2004-2012, Nov. 2014.   DOI
2 M. S. Manoharan, A. Ahmed, and J.-H. Park, “Peak-valley current mode controlled H-bridge inverter with digital slope compensation for cycle-by-cycle current regulation,” J. Elect. Eng. Technol., Vol. 10, No. 5, pp. 1989-2000, Sep. 2015.   DOI
3 N. Femia, G. Lisi, G. Petrone, G. Spagnuolo, and M. Vitelli, “Distributed maximum power point tracking of photovoltaic arrays: Novel approach and system analysis,” IEEE Trans. Ind. Electron., Vol. 55, No. 7, pp. 2610-2621, Jul. 2008.   DOI
4 C. Olalla, D. Clement, M. Rodriguez, and D. Maksimovic, “Architectures and control of submodule integrated dc-dc converters for photovoltaic applications,” IEEE Trans. Power Electron., Vol. 28, No. 6, pp. 2980-2997, Jun. 2013.   DOI
5 S. Qin, S. T. Cady, A. D. Dominguez-Garcia, and R. C. N. Pilawa-Podgurski, “A distributed approach to maximum power point tracking for photovoltaic submodule differential power processing,” IEEE Trans. Power Electron., Vol. 30, No. 4, pp. 2024-2040, Apr. 2015.   DOI
6 R. Bell and R. C. N. Pilawa-Podgurski, “Decoupled and distributed maxi-mum power point tracking of seriesconnected photovoltaic sub-modules using differential power processing,” IEEE J. Emerg. Sel. Topics Power Electron., Vol. 3, No. 4, pp. 881-891, Dec. 2015.   DOI
7 M. S. Manoharan, A. Ahmed, J.-W. Seo, and J.-H. Park, “Power conditioning for a small-scale PV system with charge-balancing integrated micro-inverter,” J. Power Electron., Vol. 15, No. 5, pp. 1318-1328, Sep. 2015.   DOI
8 T. Thang, N. Thao, J.-H. Jang, and J.-H. Park, “Analysis and design of grid-connected photovoltaic systems with multiple-integrated converters and a pseudo-dc-link inverter,” IEEE Trans. Ind. Electron., Vol. 61, No. 7, pp. 3377-3386, Jul. 2014.   DOI
9 A. Ahmed, P. Ganeshkumar, J.-H. Park, and H. Lee, “FPGAbased centralized controller for multiple PV generators tied to the dc bus,” J. Power Electron., Vol. 14, No. 4, pp. 733-741, Jul. 2015.   DOI
10 J. H. Park, J.-Y. Ahn, B.-H. Cho, and G.-J. Yu, “Dualmodule-based maximum power point tracking control of photovoltaic systems,” IEEE Trans. Ind. Electron., Vol. 53, No. 4, pp. 1036-1047, Jun. 2006.   DOI
11 K. A. Kim, P. S. Shenoy, and P. T. Krein, “Converter rating analysis for photovoltaic differential power processing systems,” IEEE Trans. Power Electron., Vol. 30, No. 4, pp. 1987-1997, Apr. 2015.   DOI
12 Y.-T. Jeon and J.-H. Park, "Frequency-PWM hybrid controller of single-switch forward-flyback converter for DC-link regulation of 27-level cascaded H-bridge inverter," IEICE Electronics Express, Vol. 14, No. 13, 2017.
13 J.-H. Park, H.-W. Kim, and J.-H. Park, "Magneticallycoupled boost-forward converter for high efficiency differential power processing systems," IEICE Electronics Express Vol. 14, No. 3, 2017.
14 J.-H. Park, K. T. Kim, and J.-H. Park, "Continuous conduction mode coupled-inductor buck-flyback converter for charge balancing," KIEE Spring Conference, pp. 228-230, 2015.
15 C. Kim, “An improved photovoltaic system output prediction model under limited weather information,” J. Electr. Eng. Technol., Vol. 13, No. 5, pp. 1874-1885, Sep. 2018.   DOI
16 P. Fairley, “Big solar’s big surge,” IEEE Spectrum, Vol. 52, No. 1, pp. 41-44, Jan. 2015.   DOI
17 M. S. Irfan, J.-H. Shin, and J.-H. Park, “New control method for power decoupling of electrolytic capacitor-less photovoltaic micro-inverter with primary side regulation,” J. Electr. Eng. Technol., Vol. 13, No. 2, pp. 677-687, Mar. 2018.   DOI