Direct Energy Transfer for High Efficiency Photovoltaic Energy Systems Part I: Concepts and Hypothesis
Abstract
This two-part paper presents a comprehensive comparative study on parallel power processing (PPP) and standard schemes in dc/dc converters for photovoltaic (PV) energy systems. It is demonstrated how PPP can improve direct energy transfer (DET), which results in PV systems operating at higher voltage and efficiency. Discussions of the concepts, hypotheses and computer simulations are presented in Part I. Part II provides the experimental results, which confirm the validity of the analysis and simulations.
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Temperature levels beyond recommended values may permanently damage the satellite, and even deviations from the optimum point result in inefficient operation.
“Temperature levels beyond the recommended values may permanently damage the satellite, but even deviations from optimum point results in an inefficient operation [8][9][10].”
From Irradiation Flux Modelling for Thermal–Electrical Simulation of CubeSats: Orbit, Attitude and Radiation Integration (2020) · cites this paper as [8]
PV degradation in orbit is a function of conditions in space, such as irradiance and temperature field.
“Similarly to the battery, the PV degradation in orbit is a function of the conditions in space, such as irradiance temperature field [3,4,12].”
From An Integrated Thermal-Electrical Model for Simulations of Battery Behavior in CubeSats (2021) · cites this paper as [4]
Extreme cold and hot scenarios damage PV panels, batteries, and other electronic components.
“While extreme cold and hot scenarios damage these parts and other electronic components, the optimum PV and battery performance only exists in a narrow range of temperature [4,5].”
From An Integrated Thermal-Electrical Model for Simulations of Battery Behavior in CubeSats (2021) · cites this paper as [4]
Optimum PV and battery performance exists only in a narrow range of temperature.
“While extreme cold and hot scenarios damage these parts and other electronic components, the optimum PV and battery performance only exists in a narrow range of temperature [4,5].”
From An Integrated Thermal-Electrical Model for Simulations of Battery Behavior in CubeSats (2021) · cites this paper as [4]
The performance of photovoltaic panels used in energy harvesting is affected by irradiance and temperature along the orbit.
“Besides, special attention is given to photovoltaic panels used in the energy harvesting process, whose performance is affected by irradiance and temperature along the orbit.”
From An Integrated Thermal-Electrical Model for Simulations of Battery Behavior in CubeSats (2021) · cites this paper as [4]
Cites
Fundamentals of Power Electronics
Erickson, R. W., & Maksimović, D. (2001) · Springer eBooks · doi:10.1007/b100747 · Cited by 6,125 · see citing works
Fundamentals of Power Electronics
Erickson, R. W., & Maksimović, D. (2020) · Springer eBooks · doi:10.1007/978-3-030-43881-4 · Cited by 5,423 · see citing works
Power electronics: circuits, devices, and applications
(1989) · Choice Reviews Online · doi:10.5860/choice.26-3292 · Cited by 2,283 · see citing works
Masoum, M. A. S., Dehbonei, H., & Fuchs, E. F. (2002) · IEEE Transactions on Energy Conversion · doi:10.1109/tec.2002.805205 · Cited by 820 · see citing works
Noguchi, T., Togashi, S., & Nakamoto, R. (2002) · IEEE Transactions on Industrial Electronics · doi:10.1109/41.982265 · Cited by 642 · see citing works
Switching converters with wide DC conversion range
Maksimović, D., & Ćuk, S. (1991) · IEEE Transactions on Power Electronics · doi:10.1109/63.65013 · Cited by 638 · see citing works
Integrated photovoltaic maximum power point tracking converter
Enslin, J. H. R., Wolf, M. S., Snyman, D. B., & Swiegers, W. (1997) · IEEE Transactions on Industrial Electronics · doi:10.1109/41.649937 · Cited by 516 · see citing works
Masoum, M. A. S., Dehbonei, H., & Fuchs, E. F. (2002) · IEEE Power Engineering Review · doi:10.1109/mper.2002.4312477 · Cited by 478 · see citing works
A novel maximum power point tracking technique for solar panels using a SEPIC or Cuk converter
Chung, H. S.-H., Tse, K. K., Hui, S. Y. R., Mok, C. M., & Ho, M. T. (2003) · IEEE Transactions on Power Electronics · doi:10.1109/tpel.2003.810841 · Cited by 238 · see citing works
A novel maximum power point tracker for PV panels using switching frequency modulation
Tse, K. K., Ho, M. T., Chung, H. S.-H., & Hui, S. Y. R. (2002) · IEEE Transactions on Power Electronics · doi:10.1109/tpel.2002.805594 · Cited by 172 · see citing works
A novel two-mode MPPT control algorithm based on comparative study of existing algorithms
Yu, G. J., Jung, Y., Choi, J.-Y., Choy, I., Song, J., & Kim, G. S. (2003) · Conference record of the IEEE Photovoltaic Specialists Conference · doi:10.1109/pvsc.2002.1190903 · Cited by 140 · see citing works
Kitano, T., Matsui, M., & Xu, D. (2002) · Proceedings of the Annual Conference of the IEEE Industrial Electronics Society · doi:10.1109/iecon.2001.975971 · Cited by 83 · see citing works
An on-line MPPT algorithm for rapidly changing illuminations of solar arrays
Hua, C., & Lin, J.-R. (2002) · Renewable Energy · doi:10.1016/s0960-1481(02)00214-8 · Cited by 73 · see citing works
A novel ZVT PWM Cuk power-factor corrector
Tseng, C.-J., & Chen, C. (1999) · IEEE Transactions on Industrial Electronics · doi:10.1109/41.778240 · Cited by 73 · see citing works
Development of Screen-Printed Silicon Solar Cells With High Fill Factors on 100 $Omega$ /sq Emitters
Hilali, M. M., Rohatgi, A., & Asher, S. (2004) · IEEE Transactions on Electron Devices · doi:10.1109/ted.2004.828280 · Cited by 68 · see citing works
Optimum load matching in direct-coupled photovoltaic power systems-application to resistive loads
Khouzam, K. Y. (1990) · IEEE Transactions on Energy Conversion · doi:10.1109/60.107220 · Cited by 63 · see citing works
Brekken, T., Bhiwapurkar, N., Rathi, M. R., Mohan, N., Henze, C. P., & Moumneh, L. R. (2003) · IEEE Power Electronics Specialists Conference (PESC) · doi:10.1109/psec.2002.1022391 · Cited by 49 · see citing works
A family of ZVS-PWM active-clamping DC-to-DC converters: synthesis, analysis, and experimentation
Duarte, C. M. C., & Barbi, I. (2002) · International Telecommunications Energy Conference (INTELEC) · doi:10.1109/intlec.1995.499003 · Cited by 28 · see citing works
A high efficiency 1.8 kW battery equalizer
Zhang, Z., & Ćuk, S. (2002) · IEEE Applied Power Electronics Conference and Exposition (APEC) · doi:10.1109/apec.1993.290627 · Cited by 27 · see citing works
Loss factors affecting power generation efficiency of a PV module
Suzuki, R., Kawamura, H., Yamanaka, S., Kawamura, H., Ohno, H., & Naito, K. (2002) · Conference record of the IEEE Photovoltaic Specialists Conference · doi:10.1109/pvsc.2002.1190910 · Cited by 16 · see citing works
A high efficiency 500 W step-up Cuk converter
Zhang, Z., & Ćuk, S. (2002) · International Power Electronics and Motion Control Conference (IPEMC) · doi:10.1109/ipemc.2000.884631 · Cited by 14 · see citing works
Evaluation of performance of MPPT equipment in photovoltaic system
Ito, R., Matsuzaki, Y., Tani, T., & Yachi, T. (2003) · Cited by 12 · see citing works
Maximum-power-point tracking method of photovoltaic power system using single transducer
Noguchi, T., & Matsumoto, H. (2004) · Proceedings of the Annual Conference of the IEEE Industrial Electronics Society · doi:10.1109/iecon.2003.1280612 · Cited by 12 · see citing works
Novel technique for improved power conversion efficiency in PV systems with battery back-up
Snyman, D. B., & Enslin, J. H. R. (2002) · International Telecommunications Energy Conference (INTELEC) · doi:10.1109/intlec.1991.172378 · Cited by 12 · see citing works
Optimal control of solar energy combined with MPPT and battery charging
Wang, J., Liu, J., Libo, W., & Zhao, Z. (2003) · Cited by 10 · see citing works
A Versatile PV Array Simulation Tool
Lawrance, W. B., & Dehbonei, H. (2001) · Cited by 5 · see citing works
Flagged first, then by citations
1 of the 27 references couldn’t be matched to a known paper.
Cited by
Sorted by citations
A current and future study on non-isolated DC–DC converters for photovoltaic applications
Taghvaee, M. H., Radzi, M. A. M., Moosavain, S. M., Hizam, H., & Marhaban, M. H. (2012) · Renewable and Sustainable Energy Reviews · doi:10.1016/j.rser.2012.09.023 · Cited by 313 · see citing works
Abu‐Rub, H., Iqbal, A., Ahmed, S. M., Peng, F. Z., Li, Y., & Ge, B. (2012) · IEEE Transactions on Sustainable Energy · doi:10.1109/tste.2012.2196059 · Cited by 239 · see citing works
Issues on Solar-Generator Interfacing With Current-Fed MPP-Tracking Converters
Suntio, T., Leppäaho, J., Huusari, J., & Nousiainen, L. (2010) · IEEE Transactions on Power Electronics · doi:10.1109/tpel.2010.2048580 · Cited by 111 · see citing works
Alhafadhi, L., & Teh, J. (2019) · International Journal of Energy Research · doi:10.1002/er.5075 · Cited by 78 · see citing works
An Overview of Direct Current Distribution System Architectures & Benefits
Prabhala, V. A. K., Baddipadiga, B. P., Fajri, P., & Ferdowsi, M. (2018) · Energies · doi:10.3390/en11092463 · Cited by 73 · see citing works
Dynamic Characteristics of Current-Fed Superbuck Converter
Leppäaho, J., & Suntio, T. (2010) · IEEE Transactions on Power Electronics · doi:10.1109/tpel.2010.2056701 · Cited by 49 · see citing works
Sundaram, B. M., Manikandan, B. V., Kumar, B. P., & Winston, D. P. (2019) · Journal of Electrical Engineering and Technology · doi:10.1007/s42835-018-00075-9 · Cited by 40 · see citing works
Parallel Power Processing Topology for Solar PV Applications
Badawy, M. O., Yılmaz, A. S., Sozer, Y., & Husain, I. (2013) · IEEE Transactions on Industry Applications · doi:10.1109/tia.2013.2277546 · Cited by 39 · see citing works
Simplified Lambert W-Function Math Equations When Applied to Photovoltaic Systems Modeling
Pindado, S., Roibás-Millán, E., Cubas, J., Álvarez, J. M., Alfonso-Corcuera, D., Cubero-Estalrrich, J. L., Gonzalez-Estrada, A., Pinzón, M. S., & Jado-Puente, R. (2021) · IEEE Transactions on Industry Applications · doi:10.1109/tia.2021.3052858 · Cited by 39 · see citing works
Dynamic Characterization of Power Electronic Interfaces
Suntio, T., Viinamäki, J., Jokipii, J., Messo, T., & Kuperman, A. (2014) · IEEE Journal of Emerging and Selected Topics in Power Electronics · doi:10.1109/jestpe.2014.2313704 · Cited by 37 · see citing works
DC distribution systems — An overview
Prabhala, V. A. K., Baddipadiga, B. P., & Ferdowsi, M. (2014) · International Conference on Renewable Energy Research and Applications (ICRERA) · doi:10.1109/icrera.2014.7016575 · Cited by 36 · see citing works
Astakhov, O., Merdzhanova, T., Kin, L., & Rau, U. (2020) · Solar Energy · doi:10.1016/j.solener.2020.06.033 · Cited by 36 · see citing works
Dynamics of Photovoltaic-Generator-Interfacing Voltage-Controlled Buck Power Stage
Sitbon, M., Leppäaho, J., Suntio, T., & Kuperman, A. (2014) · IEEE Journal of Photovoltaics · doi:10.1109/jphotov.2014.2379094 · Cited by 33 · see citing works
Bidirectional High-Efficiency Nonisolated Step-Up Battery Regulator
Sanchis-Kilders, E., Maset, E., Ferreres, A., Ejea, J. B., Esteve, V., Jordan, J., Calvente, J., Garrigos, A., & Blanes, J. M. (2011) · IEEE Transactions on Aerospace and Electronic Systems · doi:10.1109/taes.2011.5937296 · Cited by 30 · see citing works
Dynamic Properties and Stability Assessment of Current-Fed Converters in Photovoltaic Applications
Leppäaho, J., Huusari, J., Nousiainen, L., Puukko, J., & Suntio, T. (2011) · IEEJ Transactions on Industry Applications · doi:10.1541/ieejias.131.976 · Cited by 28 · see citing works
Simulation of a CubeSat with internal heat transfer using Finite Volume Method
Filho, E. M., Seman, L. O., & Nicolau, V. D. P. (2021) · Applied Thermal Engineering · doi:10.1016/j.applthermaleng.2021.117039 · Cited by 26 · see citing works
Review of PV Generator as an Input Source for Power Electronic Converters
Suntio, T., Messo, T., Aapro, A., Kivimäki, J., & Kuperman, A. (2017) · Energies · doi:10.3390/en10081076 · Cited by 25 · see citing works
A Photovoltaic Model Based Method to Monitor Solar Array Degradation On-Board a Microsatellite
Soon, J. J., Chia, J. W., Aung, H., Lew, J. M., Goh, S. T., & Low, K.-S. (2018) · IEEE Transactions on Aerospace and Electronic Systems · doi:10.1109/taes.2018.2822081 · Cited by 20 · see citing works
Filho, E. M., Seman, L. O., Rigo, C. A., Nicolau, V. D. P., Ovejero, R. G., & Leithardt, V. R. Q. (2020) · Energies · doi:10.3390/en13246691 · Cited by 19 · see citing works
On the Thermo-Electrical Modeling of Small Satellite's Solar Panels
Gómez-San-Juan, A., Cubas, J., & Pindado, S. (2021) · IEEE Transactions on Aerospace and Electronic Systems · doi:10.1109/taes.2020.3048797 · Cited by 19 · see citing works
An Integrated Thermal-Electrical Model for Simulations of Battery Behavior in CubeSats
Vega Martinez, S., Filho, E. M., Seman, L. O., Bezerra, E. A., Nicolau, V. D. P., Ovejero, R. G., & Leithardt, V. R. Q. (2021) · Applied Sciences · doi:10.3390/app11041554 · Cited by 18 · see citing works
“these parts and other electronic components, the optimum PV and battery performance only exists in a narrow range of temperature [4,5].”
Backgrounddel Moral, D. L., Barrado, A., Sanz, M., Lázaro, A., & Zumel, P. (2018) · Solar Energy · doi:10.1016/j.solener.2018.10.053 · Cited by 17 · see citing works
An effective PV power generation control system using quasi-Z source inverter with battery
Ge, B., Lei, Q., Peng, F. Z., Song, D., Liu, Y., & Abu‐Rub, H. (2011) · IEEE Energy Conversion Congress and Exposition (ECCE) · doi:10.1109/ecce.2011.6063888 · Cited by 14 · see citing works
Dynamics of current-fed converters and stability-assessment of solar-generator interfacing
Leppäaho, J., Huusari, J., Nousiainen, L., & Suntio, T. (2010) · International Power Electronics Conference (IPEC) · doi:10.1109/ipec.2010.5542001 · Cited by 12 · see citing works
Analysis, Design, and Implementation of the AFZ Converter Applied to Photovoltaic Systems
del Moral, D. L., Barrado, A., Sanz, M., Lázaro, A., & Zumel, P. (2020) · IEEE Transactions on Power Electronics · doi:10.1109/tpel.2020.3010152 · Cited by 11 · see citing works
Two-Stage MPPT Power Regulator for Satellite Electrical Propulsion System
Blanes, J. M., Garrigos, A., Carrasco, J. A., Weinberg, A. H., Maset, E., Sanchis-Kilders, E., Ejea, J. B., & Ferreres, A. (2011) · IEEE Transactions on Aerospace and Electronic Systems · doi:10.1109/taes.2011.5937254 · Cited by 11 · see citing works
Hierarchical Fuzzy-Logic-Based Electrical Power Subsystem for Pico Satellite ERPSat-1
Neji, B., Hamrouni, C., Alimi, A. M., Nakajima, H., & Aslan, A. R. (2013) · IEEE Systems Journal · doi:10.1109/jsyst.2013.2285659 · Cited by 10 · see citing works
Multistring seven-level inverter for standalone photovoltaic systems
Vivek, P. V. S., & Kanakasabapathy, P. (2015) · International Conference on Technological Advancements in Power and Energy (TAP Energy) · doi:10.1109/tapenergy.2015.7229654 · Cited by 9 · see citing works
Comparison Study of Electric Power System Architectures for CubeSat
Edpuganti, A., Khadkikar, V., Zeineldin, H. H., Moursi, M. S. E., & Hosani, M. A. (2020) · IEEE International Conference on Power Electronics, Smart Grid, and Renewable Energy (PESGRE) · doi:10.1109/pesgre45664.2020.9070355 · Cited by 9 · see citing works
A new DC-DC buck-boost modified series forward converter for photovoltaic applications
del Moral, D. L., Barrado, A., Sanz, M., Lázaro, A., & Zumel, P. (2014) · IEEE Energy Conversion Congress and Exposition (ECCE) · doi:10.1109/ecce.2014.6953649 · Cited by 8 · see citing works
del Moral, D. L., Barrado, A., Sanz, M., Lázaro, A., Fernández, C., & Zumel, P. (2015) · IEEE International Conference on Compatibility, Power Electronics and Power Engineering · doi:10.1109/cpe.2015.7231114 · Cited by 7 · see citing works
Battery Backup Power System for Electrical Appliances with Two Options of Primary Power Sources
Sabry, A. H., Hasan, W. Z. W., Alkubaisi, Y. M., & Kadir, M. Z. A. A. (2018) · IEEE International Conference on Smart Instrumentation, Measurement and Applications (ICSIMA) · doi:10.1109/icsima.2018.8688757 · Cited by 7 · see citing works
del Moral, D. L., Barrado, A., Sanz, M., Lázaro, A., Fernández, C., & Zumel, P. (2019) · Solar Energy · doi:10.1016/j.solener.2019.10.082 · Cited by 7 · see citing works
Liu, Y., Abu‐Rub, H., & Ge, B. (2014) · doi:10.1002/9781118755525.ch24 · Cited by 7 · see citing works
del Moral, D. L., Barrado, A., Sanz, M., Miniguano, H., Fernández, C., Raga, C., & Lázaro, A. (2015) · Conference proceedings/Conference proceedings - IEEE Applied Power Electronics Conference and Exposition · doi:10.1109/apec.2015.7104374 · Cited by 5 · see citing works
Parallel power processing topology for solar PV applications
Badawi, M., Yılmaz, A. S., Sozer, Y., & Husain, I. (2012) · IEEE Energy Conversion Congress and Exposition (ECCE) · doi:10.1109/ecce.2012.6342261 · Cited by 4 · see citing works
Issues on Interfacing Problematics in PV Generator and MPP-Tracking Converters
Suntio, T. (2012) · InTech eBooks · doi:10.5772/27594 · Cited by 4 · see citing works
Kang, S.-H., Park, S., Min, J. K., Cho, J.-R., & Ha, M.-Y. (2012) · Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science · doi:10.1177/0954406212463845 · Cited by 3 · see citing works
Solar power controller to drive load at constant power under insufficient solar radiation
Ahammed, M. T., & Islam, M. R. (2016) · International Conference on the Developments in Renewable Energy Technology (ICDRET) · doi:10.1109/icdret.2016.7421519 · Cited by 3 · see citing works
Tanashu, M., Tadiwos, T., Kassaw, A., Admasu, S., Ezra, N., Long, T., Allen, L., Tennyson, E. M., Stranks, S. D., & Terefe, T. (2024) · International journal of engineering research in Africa · doi:10.4028/p-3anesp · Cited by 3 · see citing works
AFZ converter: a new DC-DC topology applied to photovoltaic panels
del Moral, D. L., Barrado, A., Sanz, M., Lázaro, A., & Zumel, P. (2018) · IEEE ... Workshop on Control and Modeling for Power Electronics · doi:10.1109/compel.2018.8460048 · Cited by 3 · see citing works
The analysis of DC-DC converter topologies based on stackable voltage elements
Zou, K., Scott, M. J., & Wang, J. (2010) · IEEE Energy Conversion Congress and Exposition (ECCE) · doi:10.1109/ecce.2010.5618443 · Cited by 3 · see citing works
Research on a Power Supply Scheme of Composite Bus for SAR Satellite
Song, J., Wang, G., Cao, C., Hu, L., Yang, Z., & Xin, Y. (2021) · China International SAR Symposium (CISS) · doi:10.23919/ciss51089.2021.9652369 · Cited by 2 · see citing works
Photovoltaics literature survey (No. 71)
Shalav, A. (2009) · Progress in Photovoltaics Research and Applications · doi:10.1002/pip.910 · Cited by 2 · see citing works
Photovoltaic based LED Lighting with Maximum Power Point Tracking
Mujumdar, U. B., & Tutkane, D. R. (2017) · Energy Procedia · doi:10.1016/j.egypro.2017.05.182 · Cited by 2 · see citing works
Stand-alone backup power system for electrical appliances with solar PV and grid options
Sabre, A. H., Hasan, W. Z. W., Nordin, F. H., & Kadir, M. Z. A. A. (2020) · Indonesian Journal of Electrical Engineering and Computer Science · doi:10.11591/ijeecs.v17.i2.pp689-699 · Cited by 2 · see citing works
Zhu, Y., Huang, L., Zhang, Z., & Wang, S. (2018) · European Conference on Electrical Engineering and Computer Science (EECS) · doi:10.1109/eecs.2018.00105 · Cited by 2 · see citing works
Fuzzy Logic Based Electrical Power System for Pico Satellite ERPSat-1
Neji, B., Hamrouni, C., Alimi, A. M., & Nakajima, H. (2014) · Advanced materials research · doi:10.4028/www.scientific.net/amr.875-877.1822 · Cited by 1 · see citing works
Ahammed, M. T., Tariquzzaman, M., & Mehedi, M. R. (2018) · International Journal of Computer Applications · doi:10.5120/ijca2018917962 · Cited by 1 · see citing works
MPPT of Stand-Alone Hybrid System Using Fuzzy Logic Controllers
Syama, C., & Rayappan, G. (2014)
Kumar, K. V., & Vyjayanthi, C. (2018) · International Conference on Power, Energy, Control and Transmission Systems (ICPECTS) · doi:10.1109/icpects.2018.8521633
Introduction to Current‐Fed Converters
Suntio, T., Messo, T., & Puukko, J. (2017) · doi:10.1002/9783527698523.ch7
Suntio, T., Messo, T., & Puukko, J. (2017) · doi:10.1002/9783527698523.ch1
- Authors
- Dehbonei, H., Lee, S. R., & Nehrir, H.
- Affiliations
- Kunsan National University (KR)
- Venue
- IEEE Transactions on Aerospace and Electronic Systems
- Published
- 2009-01
- Volume
- 45
- Issue
- 1
- Pages
- 31-45
- ISSN
- 0018-9251 (ISSN-L)
- OpenAlex
- W2140822289
- Cited by
- 53
- References
- 27
- Citations by year
- 2024: 1 · 2021: 5 · 2020: 5 · 2019: 3 · 2018: 8 · 2017: 4 · 2016: 1 · 2015: 3 · 2014: 7 · 2013: 2 · 2012: 5
- FWCI
- 3.70
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- IEEE Transactions on Aerospace and Electronic Systems (publishedVersion)
- Funders
- Curtin University of Technology
- Australian Research Council
- Topics
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Advanced DC-DC Converters
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Wireless Power Transfer Systems
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Photovoltaic System Optimization Techniques
- Keywords
- direct energy transfer, photovoltaic systems, DC-DC converter, high-voltage operation, conversion efficiency
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