| 引用本文: | 刘闯,齐瑞鹏,刘海军,葛树昆,支月媚,徐鑫哲.一种减小三相级联型PET各中间直流侧电容的方法[J].电力自动化设备,2017,37(11): |
| LIU Chuang,QI Ruipeng,LIU Haijun,GE Shukun,ZHI Yuemei,XU Xinzhe.Method of decreasing intermediate DC-link capacitors for three-phase cascaded power electronics transformers[J].Electric Power Automation Equipment,2017,37(11): |
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| 摘要: |
| 三相级联型电力电子变压器(PET)因其模块化和可扩展性而得到广泛应用，但其中间直流侧中限制功率波动的大电容会降低其功率密度。为解决这一问题，提出一种基于DC-DC谐振变换器的三相级联型PET正弦功率传输概念，以减小中间直流侧电容，将交流侧2倍频率的功率波动传递到公共直流侧，并保证了恒定的直流电源。当谐振变换器工作在近似谐振模式下时，可以简单有效地实现正弦功率传输概念，并简化 PET控制结构实现单级控制。虽然PET的正弦传输只有较小的功率因数调节能力，但是它可以有效地减小单向功率传输的PET的电容和制造成本。研制并测试一台样机，实验结果验证了对于基于DC-DC谐振变换器的三相级联型PET正弦功率传输的可行性。 |
| 关键词: 三相级联型电力电子变压器 正弦功率传输 2倍频率 中间直流侧电容 功率密度 DC-DC谐振变换器 准谐振模式 |
| DOI：10.16081/j.issn.1006-6047.2017.11.008 |
| 分类号:TM761 |
| 基金项目:国家自然科学基金资助项目(51307021)；国家电网公司科技项目(SGRI-DL-71-15-005) |
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| Method of decreasing intermediate DC-link capacitors for three-phase cascaded power electronics transformers |
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LIU Chuang1, QI Ruipeng1, LIU Haijun2, GE Shukun1, ZHI Yuemei1, XU Xinzhe3
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1.School of Electrical Engineering, Northeast Electric Power University, Jilin 132012, China;2.Global Energy Interconnection Research Institute, Beijing 102211, China;3.State Grid Beijing Electric Power Company, Beijing 100031, China
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| Abstract: |
| The three-phase cascaded PET(Power Electronics Transformer) is widely applied due to its modularity and expandability, but its intermediate bulk DC-link capacitors for limiting power fluctuation may reduce its power density. To solve this problem, the SPT(Sinusoidal Power Transfer) concept is proposed for three-phase cascaded PETs to reduce the intermediate DC-link capacitance, transfer double-frequency AC-side DLF(Double-Line-Frequency) power fluctuation to the common DC side and maintain the constant DC power supply. When the resonant DC-DC converters operate in the quasi-resonant mode, the SPT concept is simply and effectively realized, and the PET control system structure is simplified to a single-stage control system. Although the SPT for PET has small capability of power factor control, it is a new trend for unidirectional PET to effectively reduce the volume and cost. A hardware prototype is designed and tested. The experimental results verify the feasibility of applying the proposed SPT concept to three-phase cascaded PETs with DC-DC resonant converters. |
| Key words: three-phase cascaded power electronics transformer sinusoidal power transfer double-line-frequency intermediate DC-link capacitor power density DC-DC resonant converter quasi-resonant mode |
