A Low Q Three-Phase Series Resonant Converter for PV Applications

Abirami Kalathy (), Arpan Laha, Majid Pahlevani and Praveen Jain
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Abirami Kalathy: Department of Electrical and Computer Engineering, Queen’s University, Kingston, ON K7L 3N6, Canada
Arpan Laha: Department of Electrical and Computer Engineering, Queen’s University, Kingston, ON K7L 3N6, Canada
Majid Pahlevani: Department of Electrical and Computer Engineering, Queen’s University, Kingston, ON K7L 3N6, Canada
Praveen Jain: Department of Electrical and Computer Engineering, Queen’s University, Kingston, ON K7L 3N6, Canada

Energies, 2023, vol. 16, issue 4, 1-23

Abstract: In this paper, a soft-switched three-phase resonant converter with a low quality factor (Q) design is proposed for Photovoltaic (PV) energy harvesting systems with a very wide range of operating conditions. Due to the low quality factor (Q ≤ 1), the voltage stress across the capacitors is drastically reduced. However, a major challenge of using a low Q design is the wide switching frequency range required for operation over a wide range of load and input conditions. In order to reduce the switching frequency range, this paper introduces a hybrid modulation technique employing asymmetric pulse width modulation (APWM) along with variable frequency modulation. The proposed modulation scheme also substantially extends the soft-switching range of the converter from full-load upto 10–35% load condition over a wide range of line voltages. To sustain soft-switching in the entire operating region of the converter, the converter is operated in a hybrid structure with single-phase and burst modes at light load conditions. A comprehensive time-domain analysis of the proposed converter is presented, which greatly improves accuracy over conventional frequency-domain modeling. Experimental results from a 1 kW prototype are presented to verify the performance of the converter and validate the theoretical analysis.

Keywords: three-phase resonant converter; series resonant; zero voltage switching (ZVS); photovoltaic (PV); low Q; high power DC-DC; time-domain analysis (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: 2023
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