A Novel Bidirectional DC–DC Converter with Low Stress and Low Magnitude Ripples for Stand-Alone Photovoltaic Power Systems

Alamdar Hussain, Rizwan Akhtar, Babar Ali, Saeed Ehsan Awan and Shahid Iqbal
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Alamdar Hussain: School of Electronics and information, Jiangsu University of Science and technology, Zhenjiang 212003, China
Rizwan Akhtar: School of Electronics and information, Jiangsu University of Science and technology, Zhenjiang 212003, China
Babar Ali: Department of Electrical Engineering, COMSATS University Islamabad, Attock Campus, Attock 43600, Pakistan
Saeed Ehsan Awan: Department of Electrical Engineering, COMSATS University Islamabad, Attock Campus, Attock 43600, Pakistan
Shahid Iqbal: Department of Electrical Engineering, University of Gujrat, Gujrat 50700, Pakistan

Energies, 2019, vol. 12, issue 15, 1-29

Abstract: Photovoltaic (PV) power is one of the promising solutions to address the fast-growing electricity demand. Electricity generated from the array of solar panels is not fixed due to the continuous change in environmental conditions. Therefore, an efficient power management system is required to facilitate the consumer with an uninterruptable power supply (UPS). When the energy demand is lower than the energy generated by the PV power system, the excessive energy must be stored in batteries and, when the energy demand is higher than the energy generated by the PV system, then the stored energy in the battery must be released in order to fulfil the load demand. Therefore, a bidirectional DC–DC converter is required to store and release energy. Conventional bidirectional converters offer low gain, low power density, low efficiency, high switching stress, and high magnitude of current and voltage ripples. In this paper, a bi-directional DC–DC converter that has low stress and low ripples is proposed for the operation of Stand-alone PV power systems. The proposed converter is implemented in ORCAD/PSPICE (Oregon Computer Aided Design/Personal Computer Simulation Program with Integrated Circuit) and both the charging and discharging modes have been analyzed explicitly. The results were compared with conventional converters and were found to be satisfactory. A significant improvement in the magnitude of output voltage and current ripples has been noticed. Besides, considerable improvement in switching stress (45% reduction as compared with conventional converters) and a 16.6% reduction in the magnitude of ripples was realized.

Keywords: bidirectional DC–DC converter; PV power system; UPS; switching stress; voltage and current ripples (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
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