Hybrid High Voltage Gain Transformerless DC–DC Converter

Andrade, António Manuel Santos Spencer; Faistel, Tiago Miguel Klein; Guisso, Ronaldo António; Toebe, Ademir

doi:10.1109/tie.2021.3066939

Cited by 69 publications

(39 citation statements)

References 27 publications

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“…In [22] VL technique is used to get desired value of gain but the converter utilizes two switches that are switched alternately. A hybrid converter based on voltage multiplier cell (VMC) and switched capacitor cells with high gain is presented in [23]. It overcomes shortcomings such as high voltage and current stress on the power devices.…”

Section: Introductionmentioning

confidence: 99%

A New Transformerless Ultra High Gain DC–DC Converter for DC Microgrid Application

Khan

Zaid²,

Mahmood

et al. 2021

IEEE Access

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High gain dc-dc converters are used in several applications which include solar photovoltaic system, switch-mode power supplies and fuel cells. In this paper, an ultra-high gain dc-dc boost converter is proposed and analysed in detail. The converter has a gain of six times as compared with the boost converter. The high gain is achieved by utilizing switched inductors and switched capacitors. A modified voltage multiplier cell (VMC) with switched inductors is proposed. The converter has a single switch which makes its operation easy. Moreover, the voltage across the switch, diodes and capacitors are less than the output voltage which increases the overall efficiency of the converter. The converter performance in steady-state is analysed in detail and it is compared with other latest high gain converters. The working of the converter in non-ideal conditions is also discussed in detail. The loss analysis is done using PLECS software by incorporating the real models of switches and diodes from the datasheet. To confirm and validate the working of the proposed converter a hardware prototype of 200 W is developed in the laboratory. The converter achieves high gain at low duty ratios and its performance is found to be good in open and closed loop conditions. INDEX TERMSBoost Converter, DC Microgrid, Duty cycle, Ultra High Gain, Voltage stress Battery Fuel Cell High Gain DC-DC Converter Solar PV Cell Low DC Voltage (12-60V) High DC Voltage (200 -300V

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Section: Introductionmentioning

confidence: 99%

A New Transformerless Ultra High Gain DC–DC Converter for DC Microgrid Application

Khan

Zaid²,

Mahmood

et al. 2021

IEEE Access

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“…Moreover, the input current is discontinuous which is a major F I G U R E 1 Applications of high-gain DC-DC converter drawback. A hybrid interleaved converter with a voltage multiplier cell (VMC) made up of switched capacitors is proposed in Andrade et al 12 The switched capacitors although enhance the gain of the converter but introduce transients in the input current due to the charging of the capacitors. A family of Z-source and QZS converters is presented by authors in Liu et al 13 The proposed converters have a gain of 1/(1 À 4λ).…”

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confidence: 99%

A non‐isolated quasi‐Z‐source‐based high‐gain DC–DC converter

Mahmood

Zaid

Khan

et al. 2021

Circuit Theory & Apps

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To overcome the problems associated with Z-source-based DC-DC converters, a quasi-Z-source (QZS)-based high-gain DC-DC boost converter with switched capacitors is proposed in this work. Z-source-based DC-DC converters have problems like low-voltage gain, discontinuous input current, and high-voltage stress on the active and passive components. The proposed converter can produce a high-voltage gain of more than 10 times for a duty cycle of less than 0.5. The converter has other desirable features like reduced voltage stress across the switching components and continuous input current (CIC). It comprises a QZS cell made up of switched inductors and a voltage multiplier cell (VMC) made up of switched capacitors. The power loss analysis is done using PLECS software by incorporating the real parameters of switches and diodes from the datasheet. A hardware prototype of 200 W is developed in the laboratory to verify the working of the converter. In experimental results for an output power of 200 W, the converter is operated with a source voltage of 33 V at a duty ratio of 0.4 providing an output voltage of 395 V. The converter performance is good in open-loop conditions and is verified through experimental results. K E Y W O R D S duty ratio (λ), quasi-Z-source (QZS), voltage multiplier cell (VMC), voltage stress | INTRODUCTIONNowadays, gain DC-DC converters have found applications in electric vehicles (EVs), DC microgrids, switch-mode power supplies, and robotics to name a few. The power range of these high-gain converters varies from few milliwatts to a kilowatt range. The main objective is to build a topology with a high gain and reduced number of components. Desirable features like low voltage and current stress, common ground with low ripple in input current make the highgain converter an attractive choice for renewable energy applications. Conventional step-up converters and their variants need to be operated at a high duty ratio (λ) to obtain high-voltage gain. Consequently, the efficiency decreases, and the stress across the components increases. Moreover, the low and fluctuating output voltage of the PV panel cannot be fed to the inverter directly; it must be boosted with reduced ripple using a high-gain converter. 1,2 In Figure 1, it is depicted that a high-gain DC-DC converter can effectively boost the voltage from various sources like fuel cells, solar PV modules, battery, and an ultra-capacitor. These converters are used at the front end of a grid-connected inverter to maintain the DC-link voltage. The DC-DC converters have isolated and non-isolated structures. The isolated structures

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“…The sources of a DG system produce DC or AC voltage and current. Thus, power electronics converters must convert this current or voltage into levels compatible with the grid tie, load, or microgrid DC bus 1–3 . Furthermore, it should be noted that, nowadays, the world's energy matrix is based predominantly on fossil fuels (nonrenewable energy sources), such as oil, coal, and natural gas.…”

Section: Introductionmentioning

confidence: 99%

High step‐up buck–boost DC–DC converter with coupled inductor and low component count for distributed PV generation systems

Toebe

Faistel

Andrade

2022

Circuit Theory & Apps

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This paper presents a non‐isolated high step‐up buck–boost with a coupled inductor DC–DC converter relevant for distributed photovoltaic (PV) generation systems. The proposed topology can reach high voltage gain through the combination of a buck–boost converter with a coupled inductor. The configuration of the proposed converter allows to achieve a natural voltage clamp circuit for the switch, recovering the energy stored in the leakage inductance of the coupled inductor. Moreover, the converter allows soft‐switching conditions, that is, Zero Current Switching (ZCS) for the diodes and nearly ZCS for the active switch. Also, the proposed converter presents a low component count and common ground connection of the input and output. The proposed converter is evaluated theoretically by the principle of operation in continuous‐conduction mode (CCM) and discontinuous‐conduction mode (DCM), voltage gain derivation, external characteristics, semiconductor voltage stress, current stress, and design guidelines. Finally, a 650‐W, 36/380‐V, 50‐kHz prototype was built in the laboratory to experimentally evaluate the proposed converter, which reached a maximum efficiency rate of 96.58%.

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Hybrid High Voltage Gain Transformerless DC–DC Converter

Cited by 69 publications

References 27 publications

A New Transformerless Ultra High Gain DC–DC Converter for DC Microgrid Application

A New Transformerless Ultra High Gain DC–DC Converter for DC Microgrid Application

A non‐isolated quasi‐Z‐source‐based high‐gain DC–DC converter

High step‐up buck–boost DC–DC converter with coupled inductor and low component count for distributed PV generation systems

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