High-Efficiency High Step-Up DC–DC Converter With Dual Coupled Inductors for Grid-Connected Photovoltaic Systems

Forouzesh, Mojtaba; Shen, Yanfeng; Yari, Keyvan; Siwakoti, Yam P.; Blaabjerg, Frede

doi:10.1109/tpel.2017.2746750

Cited by 339 publications

(179 citation statements)

References 33 publications

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“…Hence, it will be inevitable to use the high step‐up DC‐DC converter. Therefore, many topologies are proposed to increase the voltage gain without an extreme duty ratio …”

Section: Introductionmentioning

confidence: 99%

A novel structure for high step‐up DC‐DC converter with flexibility under the variable loads for EV solar charging system

Eskandarian

Harchegani

Kazemi

2020

Int Trans Electr Energ Syst

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Summary Recently, with the development of electric vehicles (EVs), in order to compensate for the undesirable effects of charging stations on grid characteristics, paying attention to the local generators based on renewable energy has increased and has caused to develop of the peripheral systems. In this paper, a high step‐up multistage structure consisting of several integrated boost flyback converter (IBFC) has been proposed. In the combination of these stages, the boost subconverters are interleaved in order to charge the battery bank and are in series with the flyback subconverters in order to supply the variable loads. The proposed structure has advantages, such as applicability in high voltage step‐up cases, enhanced reliability in photovoltaic system, and flexibility against variable power consumption. In addition, this structure at the no‐load condition has the ability to charge the battery system with proper voltage and supply several vehicles simultaneously without any voltage drop. Furthermore, the energy stored in leakage inductor can be recycled instead of damping with passive snubbers, resulting in high conversion efficiency and simple circuit structure with fewer components. The performance of proposed structure is analyzed in detail at no‐load, loading, and input power outage conditions. Then, the proposed converter with solar panel input power in order to supply the EV charging system is simulated in Matlab/Simulink to verify the analytical results. Finally, a three‐stage prototype (17.3–240 V) with 60 W solar panel input has been developed, which validates the feasibility and the effectiveness of the proposed topology using variable loads (180, 360, 720 W).

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“…Hence, it will be inevitable to use the high step‐up DC‐DC converter. Therefore, many topologies are proposed to increase the voltage gain without an extreme duty ratio …”

Section: Introductionmentioning

confidence: 99%

A novel structure for high step‐up DC‐DC converter with flexibility under the variable loads for EV solar charging system

Eskandarian

Harchegani

Kazemi

2020

Int Trans Electr Energ Syst

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“…Converters from [8][9][10] produce high voltage gain and reduced stress on switches but still introduce high input current ripple. Converters from [11][12][13] have solved these issues by being high voltage gain with ZVS and low input ripple. These would be good candidates for an application where galvanic isolation is not required.…”

Section: Introductionmentioning

confidence: 99%

An Isolated High Voltage Boost Current-Fed DC–DC Converter Based on 1:1 Transformer Multiplier Cells and ZVS Operation

2020

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This paper presents a high step up, current fed, interleaved, isolated DC-DC converter with voltage multipliers and ZVS (zero voltage switching). The converter provides zero voltage switching for all active switches and provides a high step up voltage gain that is suitable for very low voltage source applications, such as PV and other renewable sources. In addition, this converter allows the utilization of very low voltage stress switches and diodes. It reduces the current stress by interleaving the input current, and reduces the voltage stress by utilizing a half bridge based multiplier cell integrated configuration at the output voltage while providing high frequency galvanic isolation. The isolation is achieved through the use of 1:1 transformers which are easier to design, and the need for a high turns ratio is absent in this converter. The main theory of operation and the design guideline are presented, as is a laboratory prototype, all to validate the concept.Abstract: This paper presents a high step up, current fed, interleaved, isolated DC-DC converter with voltage multipliers and ZVS (zero voltage switching). The converter provides zero voltage switching for all active switches and provides a high step up voltage gain that is suitable for very low voltage source applications, such as PV and other renewable sources. In addition, this converter allows the utilization of very low voltage stress switches and diodes. It reduces the current stress by interleaving the input current, and reduces the voltage stress by utilizing a half bridge based multiplier cell integrated configuration at the output voltage while providing high frequency galvanic isolation. The isolation is achieved through the use of 1:1 transformers which are easier to design, and the need for a high turns ratio is absent in this converter. The main theory of operation and the design guideline are presented, as is a laboratory prototype, all to validate the concept.

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“…14,15 However, the complex start-up, high current through the clamping device, and the use of costly components limit its application. In Faraji and Farzanehfard 20 and Forouzesh et al, 21 a coupled inductor-based DC-DC converter is introduced, which is synthesized by combining two high step-up converters. The active clamp circuit is used to eliminate the effect of leakage inductance.…”

Section: Introductionmentioning

confidence: 99%

A wide load range ZVS high voltage gain hybrid DC‐DC boost converter based on diode‐capacitor voltage multiplier circuit

Priyadarshi

Kar

Karanki

2019

Int Trans Electr Energ Syst

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Summary In this paper, a single‐switch hybrid high voltage gain boost converter topology employing zero‐voltage switching (ZVS) feature is proposed. The proposed converter can achieve high voltage gain with soft switching operation over a wide range of load. The topology is a combination of the Cockcroft‐Walton diode‐capacitor voltage multiplier and a conventional boost converter, which results in a hybrid DC‐DC converter. The diode‐capacitor ladder enables the converter to achieve high voltage gain without a transformer or coupled inductor. Because of its transformerless design, single switch with lower duty cycle requirement, and ZVS feature, the efficiency of the converter is improved significantly. Moreover, due to the input inductor, it is able to provide lower input current ripple and variable fractional voltage gain, which is a key requirement for maximum power point tracking (MPPT) in photovoltaic application. A 480‐W hardware prototype with 48‐V input voltage and 450‐V output voltage is developed, and experimental results are presented to validate the efficacy of the proposed converter. The total achievable efficiency is above 95.4%, in the full load range (80‐480 W).

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High-Efficiency High Step-Up DC–DC Converter With Dual Coupled Inductors for Grid-Connected Photovoltaic Systems

Cited by 339 publications

References 33 publications

A novel structure for high step‐up DC‐DC converter with flexibility under the variable loads for EV solar charging system

A novel structure for high step‐up DC‐DC converter with flexibility under the variable loads for EV solar charging system

An Isolated High Voltage Boost Current-Fed DC–DC Converter Based on 1:1 Transformer Multiplier Cells and ZVS Operation

A wide load range ZVS high voltage gain hybrid DC‐DC boost converter based on diode‐capacitor voltage multiplier circuit

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