Weighted Efficiency Optimization of Flyback Microinverter Under Improved Boundary Conduction Mode (i-BCM)

Nanakos, Anastasios Ch.; Christidis, Georgios C.; Tatakis, Emmanuel C.

doi:10.1109/tpel.2014.2372005

Cited by 56 publications

(26 citation statements)

References 39 publications

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“…The transformer copper losses of the proposed micro-inverter can be estimated by [29][30][31] P cop ¼ P cop1 þ P cop2 P cop1 ¼ R ac I 2 pri;rms1 þ R dc I 2 pri;avg1 V e and A e are effective core volume and effective cross-sectional area of the core, respectively.…”

Section: Transformer Lossesmentioning

confidence: 99%

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A new adaptive clamp for improving weighted efficiency in grid‐tied photovoltaic interleaved two‐switch flyback micro‐inverter

Mohammadi

Izadfar

Eskandarian

2019

Int Trans Electr Energ Syst

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Summary This paper proposes a new adaptive clamp based on the hybrid operation of the interleaved two‐switch flyback micro‐inverter in one‐phase and two‐phase discontinuous conduction modes (DCM) depending on the output power of the PV panel. The proposed adaptive clamp controls the second switch of the two‐switch flyback structure based on the drain‐to‐source voltage spike of the flyback's main switch during the turn‐off process. Thus, in low‐voltage regions, a conventional flyback (single‐switch) operation is achieved with reduced switching, gate driving, and clamp diodes losses. Also, in the low output powers of the micro‐inverter, only one phase of the micro‐inverter operates to decrease the power loss associated with one phase. The theoretical analysis, simulation, and experimental results show the effectiveness of the proposed adaptive clamp and the phase control methods in improving the efficiency in all power ranges.

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Section: Transformer Lossesmentioning

confidence: 99%

“…Litz wire with low diameter strands is applied in high-frequency transformer windings to minimize these effects. The transformer copper losses of the proposed micro-inverter can be estimated by [29][30][31]…”

Section: Transformer Lossesmentioning

confidence: 99%

A new adaptive clamp for improving weighted efficiency in grid‐tied photovoltaic interleaved two‐switch flyback micro‐inverter

Mohammadi

Izadfar

Eskandarian

2019

Int Trans Electr Energ Syst

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“…is the resonant impedance and is the resonant angular frequency. From Equations (6) and 9, the primary current i p of T 1 is obtained as…”

Section: Symbolmentioning

confidence: 99%

“…In general, considering the cost, micro-inverters have been designed to use circuit architectures with a flyback converter [6][7][8][9][10], which provides galvanic isolation with fewer switches than other designs. Although the flyback converter has the advantage of circuit simplicity and low cost, the design must use a transformer with a high turns ratio to achieve a high voltage-conversion ratio from low dc voltage on a single PV panel.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2019

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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.

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“…They can also be applied to low‐power grid‐tied inverters to reduce the inductor volume. In recent years, many researchers have proposed to change the design from CCM to DCM or BCM for the low‐power grid‐tied inverters, aiming at size reduction of the inductors and/or achieving soft‐switching . The main difference between DCM and BCM is the switching frequency.…”

Section: Introductionmentioning

confidence: 99%

Reduction of harmonic current distortion for single‐phase grid‐tied inverter operated in discontinuous current mode

Zhang

Isobe

Tadano

2020

IEEJ Transactions Elec Engng

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Discontinuous current mode (DCM) with high-frequency operation can be an effective way to reduce the volume of inductors for low-power grid-tied inverter applications. Unlike the controllers designed for continuous current mode operations, current controllers for DCM are required to address their nonlinear characteristics. A feed-forward controller can be a good choice for the current control of the grid-tied inverters operated in DCM. However, distortions in the output current cannot be eliminated, and they can be more severe if devices with large output capacitance are applied. Two harmonic current reduction strategies, namely a partial feedback path and an improved modulation, are proposed to reduce the low-and high-order harmonics for single-phase grid-tied inverters operated in DCM. The proposed strategies are discussed and verified by a laboratory prototype in some experiments. It is indicated that the proposed modulation can mitigate the influence of device parasitic capacitance on current distortion and expand the device selections.

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Weighted Efficiency Optimization of Flyback Microinverter Under Improved Boundary Conduction Mode (i-BCM)

Cited by 56 publications

References 39 publications

A new adaptive clamp for improving weighted efficiency in grid‐tied photovoltaic interleaved two‐switch flyback micro‐inverter

A new adaptive clamp for improving weighted efficiency in grid‐tied photovoltaic interleaved two‐switch flyback micro‐inverter

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

Reduction of harmonic current distortion for single‐phase grid‐tied inverter operated in discontinuous current mode

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