1500 V三电平正激变换器
2018年5月电工技术学报Vol.33 No. 9 第33卷第9期TRANSACTIONS OF CHINA ELECTROTECHNICAL SOCIETY May 2018 DOI：10.19595/https://www.360docs.net/doc/6e17920986.html,ki.1000-6753.tces.170155
1 500 V三电平正激变换器
李龙春1嵇保健1洪峰2杨广浩1
（1. 南京工业大学电气工程与控制科学学院 南京 211816
2. 南京航空航天大学电子信息工程学院 南京 210016）
摘要为适应光伏并网系统中高压直流母线的需求，提出一种1 500 V三电平正激变换器。
各DC-DC变换器内部无需滤波器，输出串并联后集中滤波构建1 500 V直流母线架构。该架构可降低开关管的应力，解决组件不均衡影响，利于电能传输，提高整机效率，具有模块化特征。集中滤波减小了滤波器体积和重量，降低输出电压纹波，减少系统成本。直流模块输出电压叠加合成三电平电压，可减小滤波电感电流脉动量。串并型结构的引入，降低单元失效的影响，同时使系统更易扩展，通用性强。文中详细分析了变换器的工作原理，设计了一台原理样机，并通过实验验证了原理的准确性。
关键词：1 500 V电压等级 集中滤波 三电平 正激变换器
中图分类号：TM46
1 500 V Three-Level Forward Converter
Li Longchun1 Ji Baojian1 Hong Feng2 Yang Guanghao1
（1. College of Electrical Engineering and Control Science Nanjing TECH University Nanjing 211816 China
2. College of Electronic and Information Engineering Nanjing University of Aeronautics & Astronautics
Nanjing 210016 China）
Abstract To meet the requirements on medium and high voltage DC collection of photovoltaic grid-connected system, this paper proposes a 1 500 V three-level forward converter. By filtering the outputs in series-parallel centrally, the modularized architecture of DC collection is established with no internal filter in each DC/DC converter. With this approach, the voltage stress of the switch is lowered, and the impact of unbalanced components can be solved, and the electric energy transmission and the efficiency of whole system can be improved. Meanwhile, centralized filtering is conducive to downsize the filter, diminish the ripple of output voltage and decline the cost of system. In the proposed converter, the three-level voltage is superimposed by output voltages from the DC modules, which contributes to decrease the inductance current pulsation. With the introduction of series-parallel structure, and the effect of the failure of system is reduced. Moreover, the structure efficiently make the system easily-expansible and strong-versatile. The operation principle of the proposed system is discussed in detail in this paper and a prototype has been established. The test results verify the correctness of the proposed ideas.
Keywords：1 500 V voltage level, centralized filter, three-level, forward converter
0引言
近年来，光伏系统功率容量显著提升，对系统的成本、效率、体积和重量等提出新的要求。直流母线电压从1 000 V向1 500 V甚至更高电压等级发展，可降低电站建造成本；减少光伏组件组串数量；提升系统中工频变压器的效率、功率密度；减少体积和重量；便于电能传输，且在直流微网、中
国家自然科学基金（51607086）和江苏省自然科学青年基金（BK20140944）资助项目。
收稿日期 2017-02-20 改稿日期 2017-05-24
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