Single-phase Power Conditioner with a Buck-boost-type Power Decoupling Circuit

Yamaguchi, S.; Shimizu, Toshihisa

doi:10.1541/ieejjia.5.191

Cited by 27 publications

(6 citation statements)

References 15 publications

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“…If the buck converter discussed in Section I is replaced with a boost or buck-boost converter, equation 2still holds. Based on (2a), using boostbased [22]- [25] or buck-boost-based [26] APD solutions, the capacitance requirement can then be reduced further as the maximum allowable voltage across the capacitor, V cb(max) , can be increased beyond the dc-link voltage. This case, however, is not preferred as it fails to meet requirement (II).…”

Section: B Identification Of the State-of-the-artmentioning

confidence: 99%

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Buck-Plus-Unfolder as the Superior Active Power Decoupling Solution for 400 Vdc/kW-Level Applications

Sadrian

Wang

2020

IEEE Open J. Power Electron.

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In single-phase ac/dc applications where reliability and/or power-density are critical, active power decoupling (APD) circuits can be employed to reduce the required capacitance on the dc-link. Various APD circuits have been proposed so far, all with their advantages and disadvantages. However, many confusions still exist in the literature on this topic which is mainly attributed to a lack of unified and comprehensive assessment criteria. In this paper, first the decisive criteria for a modern APD circuit are established, and the buck APD is identified as the current state-of-the-art, based on them. Then the buck-plus-unfolder topology with triangular current mode (TCM) modulation is proposed as an improvement, and a simple, yet solid foundation is introduced to choose the superior decoupling solution at different specifications. The operation equations for the APD with TCM modulation are derived next, and the operation of the proposed solution is demonstrated using a hardware prototype. Index Terms-Active power decoupling, double line frequency ripple, power density, single-phase PFC, single-phase inverter, triangular current mode (TCM).

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Section: B Identification Of the State-of-the-artmentioning

confidence: 99%

“…[27], [28] Single-capacitor Topologies Boost-based Fail to meet Requirement (II). [22], [23] Buck-boost-based [26] Buck-based DC/DC Buck Larger-than-optimum Cap.…”

Section: Previous Attempts To Improve the Buck Apdmentioning

confidence: 99%

Buck-Plus-Unfolder as the Superior Active Power Decoupling Solution for 400 Vdc/kW-Level Applications

Sadrian

Wang

2020

IEEE Open J. Power Electron.

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“…A power conditioning system with an APD function consists of a single-phase inverter and an APD circuit. Many circuit types have been proposed for the APD circuit, including a buck converter type (1), (2) , boost converter type (3) , buck-boost converter type (4) , etc.…”

Section: Introductionmentioning

confidence: 99%

Active Power Decoupling Control for Single-phase Power Conditioning Systems Focusing on Harmonic Voltage

Sekiguchi

Wãda

2023

IEEJ Journal IA

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Active power decoupling (APD) method has been studied to enhance the lifetime of residential photovoltaic (PV) power generation systems. In single-phase inverter, the DC voltage has a ripple due to the propagation of the 2nd power pulsation from the fundamental voltage and current. The APD method suppresses the DC voltage ripple by compensating for the power pulsation. However, a single-phase grid voltage contains harmonic components and power pulsation from these harmonics, which can propagate to the DC side. Conventional APD control compensates for the 2nd power pulsation only from the fundamental components, and thus cannot suppress the DC voltage ripple caused by the harmonic components. Therefore, this paper proposes control strategies for APD method that can compensate for the power pulsation caused by both fundamental and harmonic components. Furthermore, the effectiveness of the APD control is verified using a 400 W power conditioning system.

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“…As alternative compensation methods, active power decoupling circuits have been proposed [5][6][7][8][9]. In the active power decoupling circuits, the power ripple is absorbed by average stored energy CΔV 2 /2 of buffer capacitors with large voltage oscillation ΔV.…”

Section: Introductionmentioning

confidence: 99%

Single-Phase AC Grid-Tied Inverter with Buck-Type Active Power Decoupling Circuit Operated in Discontinuous Current Mode

et al. 2021

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This study presents a novel circuit topology for a single-phase inverter using an active power decoupling circuit operated in discontinuous current mode (DCM). In a conventional single-phase grid-tied inverter, bulky capacitors are used in a DC-link to absorb a power ripple with twice the grid frequency. However, electrolytic capacitors limit a converter's lifetime. In contrast, ceramic capacitors are used in the proposed circuit since the required capacitance is reduced. Furthermore, the active power decoupling circuit in DCM has no inductor inside by utilizing the current zero cross featured in DCM for power ripple compensation modes. An experimental verification using a 1-kW prototype shows a 90.2% current ripple reduction caused by the power ripple with twice the grid frequency. The efficiency exceeds 94% in the 20% region of the rated power to 1-kW through 96.0% of the 650 W maximum. According to a theoretical evaluation using a Pareto-front optimization assumed as a 3-kW system, the proposed circuit reaches the maximum power density at 20 kHz which is 115 % higher than that of the passive power decoupling method. The inductor volume in the proposed circuit is reduced by 30.4% compared to a conventional buck-type active power decoupling circuit.

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Single-phase Power Conditioner with a Buck-boost-type Power Decoupling Circuit

Cited by 27 publications

References 15 publications

Buck-Plus-Unfolder as the Superior Active Power Decoupling Solution for 400 Vdc/kW-Level Applications

Buck-Plus-Unfolder as the Superior Active Power Decoupling Solution for 400 Vdc/kW-Level Applications

Active Power Decoupling Control for Single-phase Power Conditioning Systems Focusing on Harmonic Voltage

Single-Phase AC Grid-Tied Inverter with Buck-Type Active Power Decoupling Circuit Operated in Discontinuous Current Mode

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