High Efficiency Bidirectional DC-DC Converter with Wide Gain Range for Photovoltaic Energy Storage System Utilization

Shi, Feng; Li, Rui; Yang, Jiatao; Yu, Wei

doi:10.1109/peac.2018.8590308

Cited by 6 publications

(5 citation statements)

References 8 publications

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“…However, in residential utilization, for safety consideration, the voltage rating of battery module is normally below 48V, which means that the converter between battery and DC bus (voltage rating is up to 1500V for three-phase fivelevel inverter) needs to meet high voltage gain requirement that non-isolated topology is difficult to achieve. Hence, isolated topology is preferred for its higher DC voltage gain and electrical isolation [22]. To achieve higher efficiency and better EMI performance, technologies that can achieve soft-switching are best choice as isolated converter in the residential photovoltaic power generation system.…”

Section: Dc-dc Convertersmentioning

confidence: 99%

“…This converter works as a one-stage DC-DC converter (LLC only) in charging mode and two-stage in discharging mode [31]. To reduce the operation frequency range and obtain wide DC gain range, a bidirectional DC-DC converter based on LLC and buck/boost was proposed in a photovoltaic energy storage system [22].…”

Section: Dc-dc Convertersmentioning

confidence: 99%

“…The operation principle of bidirectional LLC and CLLC had been introduced in some literatures [22], [27], [29]. Since the isolated bidirectional DC-DC converter in the optimized system is a two-stage topology, the bidirectional LLC or CLLC in this converter can work as a DCX which means that they only operate at resonant frequency.…”

Section: B Design Of Bidirectional Llc and Cllcmentioning

confidence: 99%

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Control and Optimization of Residential Photovoltaic Power Generation System With High Efficiency Isolated Bidirectional DC–DC Converter

Shi

2019

IEEE Access

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Currently, residential photovoltaic power generation system is increasingly used worldwide. In this paper, an optimized structure of residential photovoltaic (PV) power generation system with 1500V DC bus is proposed. It includes PV panels, a three-level boost converter, a high efficiency isolated bidirectional DC-DC converter, battery and three-phase five-level DC-AC converter that can work under islanding mode or grid-connected mode. The higher DC bus voltage greatly reduces line loss and improves efficiency of the system. An energy management scheme used for the system is proposed in this paper to guarantee the stability of the system and to increase its economic benefits. Besides, the optimized method for the structure of the bidirectional dc-dc converter is proposed. This structure can achieve higher DC voltage gain and higher efficiency. Furthermore, for low voltage battery application in the residential system, LLC and CLLC under DC transformer (DCX) mode are evaluated and the LLC is selected as the isolated bidirectional DC-DC converter. The optimized designed method of bidirectional LLC is proposed. Finally, experiments are carried out to verify the performance of the optimized converters and the system. INDEX TERMS Energy management scheme, high efficiency, isolated bidirectional DC-DC converter, LLC converter, residential photovoltaic power generation system.

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Section: Dc-dc Convertersmentioning

confidence: 99%

Section: Dc-dc Convertersmentioning

confidence: 99%

Section: B Design Of Bidirectional Llc and Cllcmentioning

confidence: 99%

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Control and Optimization of Residential Photovoltaic Power Generation System With High Efficiency Isolated Bidirectional DC–DC Converter

Shi

2019

IEEE Access

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“…For comparison, comparable power converters reported in the literature achieve power density of 0.65 kW/dm 3 [ 35 ], 1.875 kW/dm 3 [ 36 ] (gravimetric densities are not specified), 2 kW/dm 3 with 1.2 kW/kg [ 37 ] and 2.44 kW/dm 3 (gravimetric density is not specified) [ 38 ].…”

Section: Introductionmentioning

confidence: 99%

Innovative Bidirectional Isolated High-Power Density On-Board Charge for Vehicle-to-Grid

Hrbáč

Hrdina

Kolář

et al. 2022

Sensors

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This paper deals with developing and implementing a bidirectional galvanically isolated on-board charger of a high-power density. The power density of the new charger was 4 kW/kg and 2.46 kW/dm3, and the maximum efficiency was 96.4% at 3.4 kW. Due to the requirement to achieve a high-power density, a single-stage inverter topology was used. Regarding switching losses, due to the topology of the circuit with so-called hard switching, the switching frequency was set to 150 kHz. A laboratory prototype was built to verify the properties and operating principles of the described charger topology. The on-board charger has been tested in a microgrid test platform. Due to the parasitic properties of the transformer and other electronic components, overvoltage with subsequent oscillations occurred on the primary side of the transformer and damped resonance on its secondary side. These parasitic properties caused interference and especially voltage stress on the semiconductor elements. These undesirable phenomena have been eliminated by adding an active element to the charger topology and a new transistor control strategy. This new switching control strategy of transistors has been patented.

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“…The current studies in the area are focused on increasing the efficiency of every aspect of the PV systems, in order to make the most of the irradiation incidence for even more worthwhile systems. This is done by improving the module materials (Morgera and Lughi, 2015), the power electronic converters (Shi et al, 2018), control techniques (Dezuo et al, 2017) and Maximum Power Point Tracking (MPPT) methods (Soualmia and Chenni, 2016). Although, the literature is scarce regarding the installation environment analysis, which may have an enormous impact on the efficiency of PV generation.…”

Section: Introductionmentioning

confidence: 99%

Shadow Modelling Algorithm for Photovoltaic Systems Analysis and Simulation

Sá

Dezuo

Ohf

2020

Anais Do Congresso Brasileiro De Automática 2020

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In this paper, an algorithm capable of modelling shadows from nearby obstructions onto photovoltaic arrays is proposed. The algorithm developed is based on the calculation of the solar position in the sky for any given instant in order to obtain the shadow projection for any object point. The convexity properties of objects and their shadows are used to allow a precise three-dimensional solution with reduced computational power without the need to consider a vast grid of points. The idea is extended to provide the shading patterns for a desired range of time and to calculate the eciency rate of the irradiation power incident on the array in comparison to the non-shadowed case. The algorithm has interesting applications, such as optimizing array positioning and orientation, evaluating the impact of new obstructions on pre-existing array installations, allowing precise and practical data for control strategies and MPPT techniques for partially shaded systems, calculating more realistically constrained payback scenarios and nding the optimal PV array interconnection. The results obtained are illustrated by a numerical example, in which the eects of a nearby building in the irradiation received by a photovoltaic array throughout the year is analyzed.

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High Efficiency Bidirectional DC-DC Converter with Wide Gain Range for Photovoltaic Energy Storage System Utilization

Cited by 6 publications

References 8 publications

Control and Optimization of Residential Photovoltaic Power Generation System With High Efficiency Isolated Bidirectional DC–DC Converter

Control and Optimization of Residential Photovoltaic Power Generation System With High Efficiency Isolated Bidirectional DC–DC Converter

Innovative Bidirectional Isolated High-Power Density On-Board Charge for Vehicle-to-Grid

Shadow Modelling Algorithm for Photovoltaic Systems Analysis and Simulation

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