Compact Single-Stage Micro-Inverter with Advanced Control Schemes for Photovoltaic Systems

Yoon-Geol Choi, Hyeon-Seok Lee, Bongkoo Kang, Su-Chang Lee and Sang-Jin Yoon
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Yoon-Geol Choi: Department of Electrical Engineering, Pohang University of Science and Technology, Pohang 37673, Korea
Hyeon-Seok Lee: Department of Electrical Engineering, Pohang University of Science and Technology, Pohang 37673, Korea
Bongkoo Kang: Department of Electrical Engineering, Pohang University of Science and Technology, Pohang 37673, Korea
Su-Chang Lee: LG Electronics Co., Ltd., Energy Business Center, Gumi 39368, Korea
Sang-Jin Yoon: Department of Electrical Engineering, Korea Polytechnics, Gumi 39257, Korea

Energies, 2019, vol. 12, issue 7, 1-15

Abstract: This paper proposes a grid-connected single-stage micro-inverter with low cost, small size, and high efficiency to drive a 320 W class photovoltaic panel. This micro-inverter has a new and advanced topology that consists of an interleaved boost converter, a full-bridge converter, and a voltage doubler. Variable switching frequency and advanced burst control schemes were devised and implemented. A 320 W prototype micro-inverter was very compact and slim with 60-mm width, 310-mm length, and 30-mm height. In evaluations, the proposed micro-inverter achieved CEC weighted efficiency of 95.55%, MPPT efficiency >95% over the entire load range, and THD 2.65% at the rated power. The proposed micro-inverter is well suited for photovoltaic micro-inverter applications that require low cost, small size, high efficiency, and low noise.

Keywords: single stage micro-inverter; burst control; variable frequency control; maximum power-point tracking (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
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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