High-efficiency design of a grid-connected PV inverter based on interleaved flyback converter topology
High-efficiency design of a grid-connected PV inverter based on interleaved flyback converter topology
The importance of efficiency in photovoltaic (PV) inverter applications makes the topology selection as thecritical first step. Due to the low efficiency concern, flyback converter is not the preferred topology in kilowatt range inspite of its galvanic isolation, low cost, and small size advantages. Therefore, the objective of this research is to change theperception in favor of flyback converter by designing a flyback-topology-based PV inverter at 2.5 kW with high efficiency.The enhancement in efficiency is achieved mainly by using silicon carbide switching devices, designing ultrahigh-efficiencyflyback transformers with extremely low leakage inductance and by implementing a prototype with the lowest parasiticcomponents. As a result, the efficiency of the experimental inverter is measured as 95.82%. Moreover, the low cost andsmall size objectives are also maintained with very good grid side performance. Consequently, the experimental resultsdemonstrated that the flyback-converter-topology-based inverters can be successfully implemented at high power withhigh efficiency and with high commercial value.
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- [1] Masson G. Trends 2017 in Photovoltaic Applications. St. Ursen, Switzerland: International Energy Agency, 2017.
- [2] Fujimoto H, Kuroki K, Kagotani T, Kidoguchi H. Photovoltaic inverter with a novel cycloconverter for interconnection to a utility line. In: IEEE Industry Applications Conference; 8–12 October 1995; Orlando, FL, USA. pp.
2461-2467.
- [3] Lohner A, Meyer T, Nagel A. A new panel-integratable inverter concept for grid-connected photovoltaic systems.
In: IEEE International Symposium on Industrial Electronics; 17–17 June 1996; Warsaw, Poland. pp. 827-831.
- [4] de Souza KCA, de Castro MR, Antunes F. A DC/AC converter for single-phase grid-connected photovoltaic systems.
In: IEEE 28th Industrial Electronics Society Conference; 5–8 November 2002; Seville, Spain. pp. 3268-3273.
- [5] Wolfs P, Li Q. An analysis of a resonant half bridge dual converter operating in continuous and discontinuous modes.
In: IEEE 2002 Power Electronics Specialists Conference; 23–27 June 2002; Cairns, Qld, Australia. pp. 1313-1318.
- [6] Li Q, Wolfs P. A current fed two-inductor boost converter with an integrated magnetic structure and passive lossless
snubbers for photovoltaic module integrated converter applications. IEEE T Power Elrctr 2007; 22: 309-321.
- [7] Prasanna UR, Rathore AK. Analysis, design, and experimental results of a novel soft-switching snubberless currentfed half-bridge front-end converter-based PV inverter. IEEE T Power Elrctr 2013; 28: 3219-3230.
- [8] Labella T, Yu W, Lai JS, Senesky M, Anderson D. A bidirectional-switch-based wide-input range high-efficiency
isolated resonant converter for photovoltaic applications. IEEE T Power Elrctr 2014; 29: 3473-3484.
- [9] Surapaneni RK, Rathore AK. A single-stage CCM zeta microinverter for solar photovoltaic AC module. IEEE J
Em Sel Top P 2015; 3: 892-900.
- [10] Shimizu T, Wada K, Nakamura N. Flyback-type single-phase utility interactive inverter with power pulsation
decoupling on the DC input for an AC photovoltaic module system. IEEE T Power Elrctr 2006; 21: 1264-1272.
- [11] Kjaer SB, Blaabjerg F. Design optimization of a single phase inverter for photovoltaic applications. In: IEEE 2003
Power Electronics Specialists Conference; 15–19 June 2003; Acapulco, Mexico. pp. 1183-1190.
- [12] Li Y, Oruganti R. A low cost flyback CCM inverter for AC module application. IEEE T Power Elrctr 2012; 27:
1295-1303.
- [13] Hu H, Harb S, Fang X, Zhang D, Zhang Q, Shen ZJ, Batarseh I. A three-port flyback for PV microinverter
applications with power pulsation decoupling capability. IEEE T Power Elrctr 2012; 27: 3953-3964.
- [14] Kim YH, Jang JW, Shin SC, Won CY. Weighted-efficiency enhancement control for a photovoltaic AC module
interleaved flyback inverter using a synchronous rectifier. IEEE T Power Elrctr 2014; 29: 6481-6493.
- [15] Gao M, Chen M, Zhang C, Qian Z. Analysis and implementation of an improved flyback inverter for photovoltaic
AC module applications. IEEE T Power Elrctr 2014; 29: 3428-3444.
- [16] Rezaei MA, Lee KJ, Huang A. A high-efficiency flyback micro-inverter with a new adaptive snubber for photovoltaic
applications. IEEE T Power Elrctr 2016; 31: 318-327.
- [17] Christidis GC, Nanakos AC, Tatakis EC. Hybrid discontinuous/boundary conduction mode of flyback microinverter
for AC–PV modules. IEEE T Power Elrctr 2016; 31: 4195-4205.
- [18] Tamyurek B, Kirimer B. An interleaved high-power flyback inverter for photovoltaic applications. IEEE T Power
Elrctr 2015; 30: 3228-3241.
- [19] Tamyurek B, Kirimer B. A multimode photovoltaic inverter with energy storage capability. In: IEEE 2015 Energy
Conversion Congress and Exposition (ECCE); 20–24 September 2015; Montreal, QC, Canada. pp. 3740-3747.
- [20] Domb M, Redl R, Sokal NO. Nondissipative turn-off snubber alleviates switching power dissipation, secondbreakdown stress and VCE overshoot. In: IEEE 1982 Power Electronics Specialists Conference; 14–17 June
1982;
Cambridge, MA, USA. pp. 445-454.
- [21] Nowak B. Design of Planar Power Transformers. Skierniewice, Poland: Ferroxcube, 1997.
- [22] Yang D, Ruan X, Wu H. Impedance shaping of the grid-connected inverter with LCL filter to improve its adaptability
to the weak grid condition. IEEE T Power Elrctr 2014; 29: 5795-5805.