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ANovel Non-Isolated Cubic DC-DC Converter with high voltage gain for Renewable Energy Power Generation System

Energy Engineering 2024年第1期121卷 221-241页

作者： Qin Yao Yida Zeng Qingui Jia School of Electrical Engineering Southwest Jiaotong UniversityChengdu610036China

In recent years,switched inductor(SL)technology,switched capacitor(SC)technology,and switched inductor-capacitor(SL-SC)technology have been widely applied to optimize and improve DC-DC boost converters,which can effectively enhance voltage gain and reduce device stress.To address the issue of low output voltage in current renewable energy power generation systems,this study proposes a novel non-isolated cubic high-gain DC-DC converter based on the traditional quadratic DC-DC boost converter by incorporating a SC and a SL-SC unit.Firstly,the proposed converter’s details are elaborated,including its topology structure,operating mode,voltage gain,device stress,and power loss.Subsequently,a comparative analysis is conducted on the voltage gain and device stress between the proposed converter and other high-gain converters.Then,a closed-loop simulation system is constructed to obtain simulation waveforms of various devices and explore the dynamic performance.Finally,an experimental prototype is built,experimental waveforms are obtained,and the experimental dynamic performance and conversion efficiency are analyzed.The theoretical analysis’s correctness is verified through simulation and experimental results.The proposed converter has advantages such as high voltage gain,low device stress,high conversion efficiency,simple control,and wide input voltage range,achieving a good balance between voltage gain,device stress,and power loss.The proposed converter is well-suited for renewable energy systems and holds theoretical significance and practical value in renewable energy applications.It provides an effective solution to the issue of low output voltage in renewable energy power generation systems.

关键词： Cubic DC-DC converter high voltage gain low device stress high efficiency renewable energy

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Non-isolated Step-up DC-DC Converter Based on Switched Capacitor Cells

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CSEE Journal of Power and Energy Systems 2023年第3期9卷 1161-1172页

作者： Farid Mohammadi Gevork B.Gharehpetian Hasan Rastegar Mohammad Farhadi-Kangarlu Amirkabir university of technology TehranIran Faculty of Electrical and Computer Engineering Urmia UniversityUrmiaIran

A non-isolated high gain step-up DC-DC converter for low power applications is suggested in this study.In the designed transformerless converter,the main switch current and voltage stress is reduced while maintaining high voltage gain.For instance,with a duty cycle of 0.5 a voltage gain equal to 5 is achieved while the normalized switch voltage stress is 0.4.Also,it decreases power losses of active and passive elements.In the proposed converter design,the switched-capacitor(SC)technique is used to obtain maximum voltage transfer gain using only one switch.The three modes of operation,i.e.,continuous conduction mode(CCM),boundary conduction mode(BCM),and discontinuous conduction mode(DCM),are studied in detail.The small signal analysis(SSA)of the designed converter is investigated,and its steady-state model is examined under CCM.Performance of the proposed converter proposed in this study is assessed and tested using a prototype.Efficiency of the converter is recorded above 94%in a wide range of output powers.Overall,compared to the other converters,the results suggest satisfactory performance of the designed converter.An issue of the proposed converter is that its input current is not smooth due to using the switched-capacitor cell in its structure.This issue is alleviated by using input filters.

关键词： DC-DC converter high voltage gain nonisolated switched capacitor cell voltage stress

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high Step-up SEPIC Converters Based on a Family of Coat Circuit

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CSEE Journal of Power and Energy Systems 2023年第5期9卷 1753-1764页

作者： Binxin Zhu Yu Huang Yao Zhang Guanghui Liu Shihuan Chen the College of Electrical Engineering and New Energy China Three Gorges UniversityYichang 443002China

A family of coat circuits for SEPIC converters to improve their boost capability is presented.The present coat circuit does not contain any active switches,so the voltage conversion ratio of the presented converters can be enhanced without complicating its gate driver and control circuits.Meanwhile,because of the expansibility of the coat circuit,the number of its basic cells can be adjusted regarding the actual application requirements.Moreover,in comparison with a conventional SEPIC converter,voltage stress on power switch and diodes of the presented topology is lower at the same output voltage,and thus semiconductor components with low on-resistance are chosen to improve conversion efficiency of converter.The operational principle and steady state analysis of the SEPIC converter with one of the proposed coat circuits have been discussed in detail,and a 300W laboratory prototype is implemented to prove the theoretical analysis of presented converter.

关键词： Coat circuit high voltage gain low voltage stress SEPIC converter

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Developing a Super-lift Luo-converter with Integration of Buck Converters for Electric Vehicle Applications

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CSEE Journal of Power and Energy Systems 2021年第4期7卷 811-820页

作者： Behdad Faridpak Meisam Farrokhifar Mojtaba Nasiri Arman Alahyari Nasser Sadoogi Faculty of Electrical and Computer Engineering University of TabrizTabriz ***Iran Center for Energy Science and Technology Skolkovo Institute of Science and TechnologyMoscow 121205Russia Solar Energy Applications Group School of EngineeringTrinity College DublinD02 PN40 DublinIreland Research and Development Department of Jam Hoor Tabriz Company Tabriz ***Iran

In this paper,a DC-DC multi-port converter is introduced by integrating a super-lift and a buck converter(SLBC).The proposed single-input dual-output(SIDO)converter has conventional positive output voltage super-lift advantages while simultaneously generating a step・up voltage by Luo・converter and a step-down voltage by the buck converter.In this structure,without utilizing electromagnetic components to generate a dual output,the ripple in output voltages is kept low.Meanwhile,the introduced SLBC has a simple structure and an appropriate control method providing a wide range of output voltages.Besides,to illustrate the advantages of the proposed SIDO converter,a comparison with other similar configurations is carried out.Also,simulation and experiment results indicate a considerable reduction in conduction losses compared to other SIDO converters in the same situations.The operation accuracy of SLBC is validated by performing several simulations in PSCAD/EMTDC software and testing a 150W prototype in the laboratory.

关键词： DC-DC converter Luo-converter single-input dual-output(SIDO) super-lift(SL) high voltage gain

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high step-up quasi-Z-source DC–DC converters with single switched capacitor branch

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Journal of Modern Power Systems and Clean Energy 2017年第4期5卷 537-547页

作者： Xiaoquan ZHU Bo ZHANG School of Electric Power South China University ofTechnology Guangzhou 510640 China

Aiming to integrate the respective merits of the switched-capacitor converter and the quasi-Z-source converter. An novel high step-up quasi-Z-source DC–DC converter with a single switched-capacitor branch is proposed. Compared to other high boost DC–DC converters,the proposed converter can provide higher output voltage gain, lower current stress across the switches, and lower voltage stress across the output diodes by using the same or similar passive and active components. Therefore, the efficiency and reliability of the converter can be improved.The topological derivation, operating principle, parameter selection, and comparison with other DC–DC converters are presented. Finally, both simulations and experimental results are given to verify the characteristics of the proposed converter.

关键词： DC–DC converter high voltage gain Quasi-Z-source network Switched-capacitor

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