Collaborative Research: Novel Modular High-density High-efficiency medium voltage power converter

合作研究：新型模块化高密度高效中压电源转换器

• 批准号: 2022397
• 负责人: Dong Dong
• 金额: $ 19.72万
• 依托单位: Virginia Polytechnic Institute and State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-09-15 至 2024-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2022397&HistoricalAwards=false
• 关键词: Collaborative; Research; Novel; Modular; density

Novel Modular High-density High-efficiency Medium-voltage Power ConverterHigh power solid-state power converter is a critical component in many applications, such as accessing renewables energy and energy storages from grid, e.g. solar, wind, and batteries and driving high power motors. Traditionally, most of such power converter are rated below 1 kilovolt or within lower voltage class for its simplicity. Recently, for further system cost reduction and efficiency improvement, industry is moving toward medium-voltage solutions, which can directly access the medium voltage grid, to save bulky transformer, cables and cost of the converter. To achieve such goal, it is desirable to develop a medium voltage high-power solid-state power converter, which is high-efficient, high power density/low volume and with ac output waveform close to an ideal sinusoidal waveform. To address such desire, the principle investigators proposed a novel modular high density medium-voltage power converter topology, namely three-level hybrid modular multilevel converter, which combines branches with cascaded modular cells and traditional three-level structure. The proposed concept leads to various topology variations for medium voltage application. In particular, the rectifier variation with diode as the three level structure can provide a significant cost and total system size saving and efficiency improvement compared to classic modular multilevel converter solution. Compared with the state of art solution, this proposed solution can reduce the converter volume/weight by up to 50% and the improve the converter efficiency by up to 30% while achieve the same voltage and current rating. In addition, thanks to the modular design, the proposed solution can also achieve high-fidelity ac output and can be scaled up to higher voltage rating for future applications without intensive engineering design rework. The low voltage and medium voltage silicon carbide devices can be used in the proposed family of topologies to leverage its switching-loss savings to synthesize high-fidelity ac output. Such modular design also means built-in system redundancy which can substantially improve system reliability. Thus, the intellectual merits of the proposed solution will make a strong impact on a broad range of medium voltage power conversion applications, like renewable energy grid-integration, subsea and offshore dc power delivery, naval medium voltage direct current power system, industrial variable speed drives, and transportation high-speed electric propulsion system. There are many fundamental control challenges and operation analysis for this topology and its variations. Through the proposed program, the detailed topology and operation analysis of the family of proposal converter topology will be performed for both unity power factor and non-unity power factor conditions. The phase-arm and phase energy balancing strategies will be explored and verified in simulation. And its benefits will be analyzed through detailed engineering design for down-selected example systems, including fault handling capability. In the end, scaled prototypes will be developed to demonstrate its innovation and benefit to industry. The unique industry consortium and Navy collaboration provided by the universities will foster a collaborative relationship among industry members, Navy R&D community, and academic researchers, which will consequently make a strong impact through this NSF research program.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

新型的模块化高密度高效率中型电压转换功率固态功率转换器是许多应用中的关键组成部分，例如从网格中访问可再生能源能量和能量孔，例如太阳能，风，电池以及驱动高电动机。传统上，大多数此类电源转换器的额定值低于1千瓦多，或者在低压类别以下，其简单性。最近，为了进一步降低系统成本和提高效率，行业正在朝着中型电压解决方案迈进，该解决方案可以直接访问中型电压网格，以节省笨重的变压器，电缆和转换器的成本。为了实现此类目标，希望开发中型电压高功率固态电源转换器，该转换器高效，高功率密度/低体积，并且AC输出波形接近理想的正弦波形。为了解决这种愿望，主要研究人员提出了一种新型的模块化高密度中型电压转换器拓扑，即三级混合模块化多层转换器，该转换器将分支与级联模块化细胞和传统的三级结构相结合。拟议的概念导致中型电压应用的各种拓扑变化。特别是，与经典的模块化多层转换器解决方案相比，用二极管的整流器变化可以提供显着的成本和总系统尺寸和效率的提高。与最先进的解决方案相比，该提出的解决方案可以将转换器的体积/重量降低高达50％，并且将转换器效率提高了30％，同时达到相同的电压和电流等级。此外，借助模块化设计，提出的解决方案还可以实现高保真性交流输出，并且可以将其扩展到更高的电压等级，即将在没有密集工程设计返工的情况下进行未来的应用。低压和中电压碳化硅设备可用于拟议中的拓扑系列中，以利用其开关损坏的节省来合成高保真AC输出。这种模块化设计还意味着内置的系统冗余，可以大大提高系统可靠性。因此，提议的解决方案的智力优点将对广泛的中型电压转换应用产生强大影响驱动器和运输高速电动推进系统。该拓扑及其变化有许多基本的控制挑战和操作分析。通过拟议的计划，将针对统一功率因数和非合同功率因数条件对提案转换器拓扑家族的详细拓扑和操作分析进行。在模拟中将探索和验证相臂和相能平衡策略。并且将通过针对下选择的示例系统（包括故障处理能力）进行详细的工程设计来分析其好处。最后，将开发规模的原型来证明其创新和对工业的利益。大学提供的独特行业财团和海军合作将在行业成员，海军研发社区和学术研究人员之间建立合作关系，因此，这将通过该NSF研究计划产生重大影响。该奖项反映了NSF的法定使命，并一直在认为值得通过基金会的智力优点和更广泛影响的评论标准来评估值得支持。

项目成果

A New Hybrid Modular Multilevel Rectifier as MVac–LVdc Active Front-End Converter for Fast Charging Stations and Data Centers

• DOI: 10.1109/tpel.2023.3283469
• 发表时间: 2023-09
• 期刊: IEEE Transactions on Power Electronics
• 影响因子: 6.7
• 作者: Jian Liu;J. Motwani;R. Burgos;Zhiding Zhou;D. Dong

Hybrid Modular Multilevel Rectifier: A New High-Efficient High-Performance Rectifier Topology for HVDC Power Delivery

• DOI: 10.1109/tpel.2021.3051959
• 发表时间: 2021-01
• 期刊: IEEE Transactions on Power Electronics
• 影响因子: 6.7
• 作者: Jian Liu;D. Dong;Di Zhang

Analysis of Hybrid Modular Multilevel Rectifier Operated at Nonunity Power Factor for HVDC Applications

• DOI: 10.1109/tpel.2022.3164099
• 发表时间: 2022-09
• 期刊: IEEE Transactions on Power Electronics
• 影响因子: 6.7
• 作者: Jian Liu;Di Zhang;D. Dong

Modeling and Control Method for a Three-Level Hybrid Modular Multilevel Converter

• DOI: 10.1109/tpel.2021.3118425
• 发表时间: 2022-03
• 期刊: IEEE Transactions on Power Electronics
• 影响因子: 6.7
• 作者: Jian Liu;Di Zhang;D. Dong

A Hybrid Modular Multilevel Converter Family With Higher Power Density and Efficiency

• DOI: 10.1109/tpel.2021.3055690
• 发表时间: 2021-08
• 期刊: IEEE Transactions on Power Electronics
• 影响因子: 6.7
• 作者: Jian Liu;D. Dong;Di Zhang