A Three-Level Modular DC/DC Converter Applied in High Voltage DC Grid

You, Hongcheng; Cai, Xu

doi:10.1109/access.2018.2829703

Cited by 26 publications

(7 citation statements)

References 30 publications

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“…HF transformer is the core of the SST, where it tremendously reducing the total volume and weight compared to the conventional LFT [82]. This advantage could be achieved due to the fact that the high frequency of the magnetic field only requires a small size of winding [83]. In this small size transformer, there is no contact between the primary and secondary sides of the converter, thus the isolation strength of the transformer could be improved [84].…”

Section: ) High-frequency Transformermentioning

confidence: 99%

“…A few major factors that the SST being proposed for the wind energy conversion system (WECS) are the reduction of weight and volume, voltage step-up and the extra functions that SST could offer such as reduction in fluctuation of voltage, voltage regulation, and compensation of reactive power which results in the improvement of PQ events [4], [83]- [85]. There are different types of WECSs in the market; however, only the WECS based on doubly fed induction generator (DFIG) is the most widely adopted because of its variable speed, constant frequency operation and small size with high MVA ratings [129].…”

Section: ) Wind Energy Conversion Systemmentioning

confidence: 99%

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State of the Art of Solid-State Transformers: Advanced Topologies, Implementation Issues, Recent Progress and Improvements

et al. 2020

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Solid-state transformer (SST) is an emerging technology integrating with a transformer power electronics converters and control circuitry. This paper comprehensively reviews the SST topologies suitable for different voltage levels and with varied stages, their control operation, and different trends in applications. The paper discusses various SST configurations with their design and characteristics to convert the input to output under unipolar and bipolar operation. A comparison between the topologies, control operation and applications are included. Different control models and schemes are explained. Potential benefits of SST in many applications in terms of controllability and the synergy of AC and DC systems are highlighted to appreciate the importance of SST technologies. This review highlights many factors including existing issues and challenges and provides recommendations for the improvement of future SST configuration and development.

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Section: ) High-frequency Transformermentioning

confidence: 99%

Section: ) Wind Energy Conversion Systemmentioning

confidence: 99%

State of the Art of Solid-State Transformers: Advanced Topologies, Implementation Issues, Recent Progress and Improvements

et al. 2020

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“…Buck converters are playing important roles in both industries and our daily life. In industry, Buck converters are applied in electric vehicles [1], renewable energy systems [2], and others [3] for power regulation and voltage conversion [4]. In our daily life, the applications of Buck converters are everywhere, such as portable electronic devices [5], power audio systems [6], photovoltaic systems [7], etc.…”

Section: Introductionmentioning

confidence: 99%

Multi-Objective Design of Output LC Filter for Buck Converter via the Coevolving-AMOSA Algorithm

Xin

Lin

2021

IEEE Access

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Output LC filter is one of the most important parts for Buck converters. The existing optimization methods for LC filter fail to provide a fully optimized design. The difficulty in a holistic design approach lies in the trade-off relationships among different design targets. For example, smaller volume results in worse filtering capability and lower efficiency. To improve the overall performance of the output LC filter in Buck converter, a multi-objective design is proposed, taking the power loss, cut-off frequency and volume as design targets. This proposed holistic design approach utilizes Pareto-Frontier to achieve a compact LC filter with optimized efficiency and filtering capability. However, Pareto-Frontier generated by the previous multiobjective algorithms suffers from nonuniform or incomplete coverage, which seriously undermines design accuracy. Thus, the coevolving-AMOSA algorithm is proposed to provide a Pareto-Frontier with uniform and complete coverage. Via this proposed multi-objective design for the output LC filter in Buck converter with the coevolving-AMOSA algorithm, output LC filter can be flexibly designed to meet requirements in various applications while maintaining outstanding comprehensive performance. Optimal design cases for three specific application scenarios are presented as examples. Finally, the experimental results validate the effectiveness of the proposed multi-objective approach.INDEX TERMS Output LC filter, multi-objective design, Pareto-Frontier, coevolving-AMOSA.

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“…However, the MMC idea offers the possibility of using the dc-dc converter in MVDC or HVDC scheme, such as in urban power distribution system, electric vehicles, traction system, electric ships etc. Thus MMC is getting more and more popularized and effective in recent years [5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…Even though MMC technologies are previously established to study advanced and verified features of converters in addition to auxiliary difficulties energy effectiveness, consistency, power compactness, simplicity, price minimization with expanding their field of implementation to develop into more appealing and competitive topology [4][5][6][7][8][9][10]. Numerous multilevel dc-dc converters are suggested excluding magnetic parts in order to obtain elevated effectiveness and high power density.…”

Section: Introductionmentioning

confidence: 99%

High Conversion Ratio Converter Using Half-Bridge Sub-Modules

SHALINI¹,

Pandey²

2020

IJETMS

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An appreciable and significant assess of consideration and mindset is currently growing up for power dc-dc converters and its further more consideration is taken towards adoption of Modular-Multilevel Converters (MMC). The paper presents a transformer less MMC by the means of superior and advanced conversion ratio for higher dc-dc power conversion. This converter is being capable of utilized mutually for both the Medium Voltage Direct Current (MVDC) transmission systems and High Voltage Direct Current (HVDC) transmission systems, due to its some remarkable distinctive attributes such as modular design, scalability, consistency, tolerance of failures, larger step up and step down ratio and lowers filtering requirements. The MMC idea connects N low voltage sub-modules in sequence to produce a high voltage output. Thus there is no complex control algorithm necessary to stabilize or balance the voltages in every sub-module. Thus the simulation and analysis of a MMC design connected with stray inductances in order to reduce losses is done with an instance of 11-times stepping up ratio.

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A Three-Level Modular DC/DC Converter Applied in High Voltage DC Grid

Cited by 26 publications

References 30 publications

State of the Art of Solid-State Transformers: Advanced Topologies, Implementation Issues, Recent Progress and Improvements

State of the Art of Solid-State Transformers: Advanced Topologies, Implementation Issues, Recent Progress and Improvements

Multi-Objective Design of Output LC Filter for Buck Converter via the Coevolving-AMOSA Algorithm

High Conversion Ratio Converter Using Half-Bridge Sub-Modules

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