Z-Source-Based High Step-Up DC–DC Converters for Photovoltaic Applications

Rahimi, Ramin; Habibi, Saeed; Ferdowsi, Mehdi; Shamsi, Pourya

doi:10.1109/jestpe.2021.3131996

Cited by 55 publications

(31 citation statements)

References 31 publications

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“…Similarly, the converters described in Rajabi et al 42 and Mahmood et al 48 provide better gains until D = 15% and D = 20%, respectively; thereafter, proposed converter takes over. Table 3 shows that the normalized voltage stress on the power switch is one or more for the various converter topologies, Zhu and Zhang, 30 Wang et al, 38 and Rahimi et al 39 for D = 30%; that is, the voltage stress on the power switch equals or exceeding the V 0 . As a result, the power switch voltage ratings of these converters are increased.…”

Section: Comparative Performance Evaluationmentioning

confidence: 99%

“…Many alternative non‐isolated high gain converters based on voltage lifting (VL) approaches have been developed to address the challenges raised by traditional topologies. Switched‐capacitor (SC) cells, 14–50 switched‐inductor (SL) cells, 19,20 voltage‐lift cells, 21 and coupled inductors 22 are used in these VL approaches. In addition to this, isolated converter topologies can achieve high‐voltage gain by adjusting the turn‐ratio of the high‐frequency transformer.…”

Section: Introductionmentioning

confidence: 99%

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A modified Z‐source switched‐capacitor based non‐isolated high gain DC‐DC converter for photovoltaic applications

Kishor

Patel

2022

Circuit Theory & Apps

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This work proposes a modified high gain DC‐DC converter integrated with two boost converter stages, based on a boost cell and a Z‐source (ZS) cell with a switched capacitor (SC). The proposed converter architecture is simple, with a continuous input current and a wide range of input voltage fluctuation handling capabilities. It also provides a high voltage gain while minimizing voltage stress on semiconductor components. Because of the aforementioned characteristics, the proposed converter is suitable for combining with low‐voltage DC‐sources to high‐voltage DC bus in a variety of applications such as solar photovoltaic (SPV), fuel‐cell, and LED lighting. The operational principles, thermal modeling, steady‐state, and dynamic performance analysis are meticulously carried out on a 400 W laboratory prototype of the proposed converter. The converter's performance is carefully compared with similar existing topologies in terms of total device count and size, the voltage stress on power semiconductors, voltage gain, and peak efficiency. Furthermore, experimental findings show that a 12 V input is boosted to 98.8 V at a duty ratio of 0.3, demonstrating the efficacy of the proposed converter over a comparable structure.

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Section: Comparative Performance Evaluationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A modified Z‐source switched‐capacitor based non‐isolated high gain DC‐DC converter for photovoltaic applications

Kishor

Patel

2022

Circuit Theory & Apps

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“…To assess the feasibility of the biquadratic converter in solar PV application, a simulation study has been conducted on the biquadratic converter interfaced solar PV panel. The Perturb & Observe (P&O) algorithm [30] is used for tracking the maximum power from the solar PV panel. The block diagram of the biquadratic converter interfaced solar PV panel with MPPT controller is shown in Fig.…”

Section: Biquadratic Converter Interfaced Solar Pv Panelmentioning

confidence: 99%

“…Some of these converters utilize more components when the converter extended to next stage, that increases the converter losses, bulkiness of the converter, etc. Some of the high gain DC-DC converters are reported in [27]- [30]. These converters use 2 switches in the topological structure; moreover, the converter [28] has a limitation in the operating when duty ratio D > 0.5 (ideally).…”

Section: Introductionmentioning

confidence: 99%

Switched LC Network-Based Multistage Ultra Gain DC-DC Converter

et al. 2022

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A multi-stage active switched inductor-capacitor network (SLCN)-based high gain DC-DC converter structure with a single switch is proposed in this paper. The idea of utilizing multiple number of SLCN networks to achieve an ultra-voltage gain is proposed. The achievement of ultra-gain helps to operate the converter at lower duty ratio. Hence, a reduction of conduction loss, improvement in efficiency and elimination of core saturation are attained in the proposed bi-quadratic converter compared to the conventional converters. The performance of a biquadratic boost converter which is formulated from the n-stage SLCN converter for n = 2, is analyzed. To reduce the effect of parasitic elements of the semiconductor devices, the SiC-based devices are selected. The small-signal model of the biquadratic converter is derived, and a PI controller is designed to regulate the output voltage. The designed controller is implemented using XSG platform. Experimental waveforms for 650 V output voltage, 500 W output power and 50 kHz switching frequency are presented. The performance of the proposed converter with similar recently reported topologies is compared. Simulation results of the bi-quadratic converter interfaced solar PV panel with P&O algorithm are presented to assess the feasibility of the proposed converter in solar PV application.INDEX TERMS DC-DC converter, high voltage gain, switched LC network, wide bandgap devices.

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“…The associate editor coordinating the review of this manuscript and approving it for publication was Kan Liu . The traditional boost DC-DC converter can provide a high-voltage gain under extremely large duty cycles; however, it suffers from high voltage and current stresses in the semiconductor devices, reverse-recovery problem in the output, diode, large ripple on the input current and the output voltage and high power losses [4], [5]. To eliminate these effects, voltage-boosting (VB) techniques were presented to extend the voltage gain of the conventional boost converter without an extremely high duty cycle.…”

Section: Introductionmentioning

confidence: 99%

An Interleaved High Step-Up DC-DC Converter Based on Integration of Coupled Inductor and Built-in-Transformer With Switched-Capacitor Cells for Renewable Energy Applications

et al. 2022

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This paper proposes an interleaved high step-up DC-DC converter with the coupled inductor (CI) and built-in transformer (BIT) for renewable energy applications. Two double-winding (2W) CIs and one triple-winding (3W) BIT are integrated with the switched-capacitor (SC) voltage multiplier cells (VMCs) to achieve high-voltage gains without extreme duty cycles. The CIs and BIT turns-ratios provide two other degrees of freedom-in addition to the duty cycle-to adjust the voltage gain that leads to increased design flexibility. The diodes turn off naturally under the zero-current switching (ZCS) conditions because their current falling rates are controlled by the leakage inductances of the CIs and BIT; therefore, the diodes' reverse-recovery problems are alleviated. Moreover, employing passive diode-capacitor clamp circuits, the voltage stresses of the switches are limited to a low value far less than the output voltage. Additionally, the leakage inductances energies are recycled and transferred to the output to further extend the voltage gain. Furthermore, due to the interleaved structure, the input current ripple and current stresses of the components are reduced. The proposed converter is analyzed in detail and then compared with similar converters that employed CIs and/or BIT along with passive/active clamp circuits for the MOSFETs. Finally, to verify the feasibility of the proposed converter, the experimental results of a 200 W prototype with output voltage of 400 V and voltage gain of 25 are presented.

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Z-Source-Based High Step-Up DC–DC Converters for Photovoltaic Applications

Cited by 55 publications

References 31 publications

A modified Z‐source switched‐capacitor based non‐isolated high gain DC‐DC converter for photovoltaic applications

A modified Z‐source switched‐capacitor based non‐isolated high gain DC‐DC converter for photovoltaic applications

Switched LC Network-Based Multistage Ultra Gain DC-DC Converter

An Interleaved High Step-Up DC-DC Converter Based on Integration of Coupled Inductor and Built-in-Transformer With Switched-Capacitor Cells for Renewable Energy Applications

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