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【24h】Modular Medium-Voltage Grid-Connected Converter With Improved Switching Techniques for Solar Photovoltaic Systems

机译具有改进的开关技术的太阳能光伏系统模块化中压并网转换器

【摘要】The high-frequency common magnetic-link made of amorphous material, as a replacement for common dc-link, has been gaining considerable interest for the development of solar photovoltaic medium-voltage converters. Even though the common magnetic-link can almost maintain identical voltages at the secondary terminals, the power conversion system loses its modularity. Moreover, the development of high-capacity high-frequency inverter and power limit of the common magnetic-link due to leakage inductance are the main challenging issues. In this regard, a new concept of identical modular magnetic-links is proposed for high-power transmission and isolation between the low and the high voltage sides. Third harmonic injected sixty degree bus clamping pulse width modulation and third harmonic injected thirty degree bus clamping pulse width modulation techniques are proposed which show better frequency spectra as well as reduced switching loss. In this paper, precise loss estimation method is used to calculate switching and conduction losses of a modular multilevel cascaded converter. To ensure the feasibility of the new concepts, a reduced size of 5 kVA rating, three-phase, five-level, 1.2 kV converter is designed with two 2.5 kVA identical high-frequency magnetic-links using Metglas magnetic alloy-based cores.

【摘要机译】由非晶态材料制成的高频公共磁链作为普通直流链的替代品,已经引起了太阳能光伏中压转换器的广泛关注。即使公用磁链几乎可以在次级端子上保持相同的电压,但功率转换系统仍会失去其模块化。此外,大容量高频逆变器的发展以及由于漏感引起的公共磁链功率限制是主要的挑战性问题。在这方面,提出了相同的模块化磁链的新概念,用于在低压侧和高压侧之间进行大功率传输和隔离。提出了三次谐波注入六十度母线钳位脉冲宽度调制和三次谐波注入三十度母线钳位脉冲宽度调制技术,它们显示出更好的频谱并降低了开关损耗。本文使用精确的损耗估计方法来计算模块化多级级联转换器的开关损耗和传导损耗。为确保新概念的可行性,使用基于Metglas磁性合金的磁芯,设计了尺寸缩小的5 kVA三相五电平1.2 kV转换器,并配备了两个2.5 kVA相同的高频磁链。

【作者】Md. Rabiul Islam;A. M. Mahfuz-Ur-Rahman;Md. Mazharul Islam;Youguang G. Guo;Jianguo G. Zhu;

【作者单位】Department of Electrical and Electronic Engineering, Rajshahi University of Engineering and Technology, Rajshahi, Bangladesh; Department of Electrical and Electronic Engineering, Rajshahi University of Engineering and Technology, Rajshahi, Bangladesh; Department of Electrical and Electronic Engineering, Rajshahi University of Engineering and Technology, Rajshahi, Bangladesh; University of Technology Sydney, Ultimo, N.S.W., Australia; University of Technology Sydney, Ultimo, N.S.W., Australia;

【年(卷),期】2017(64),11

【年度】2017

【页码】8887-8896

【总页数】10

【原文格式】PDF

【正文语种】eng

【中图分类】;

【关键词】Pulse width modulation;Amorphous magnetic materials;Harmonic analysis;Clamps;Frequency modulation;Medium voltage;

机译 脉宽调制非晶磁性材料谐波分析钳位频率调制中压;
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