兆瓦级光伏中压直流并网变换器研制及实证应用  

Development and Empirical Application of Megawatt-level Medium-voltage DC Photovoltaic Grid-connected Converter

作　　者：黄欣科 王环[1] 周宇 魏苗苗 王一波[1] 许洪华[1] HUANG Xinke;WANG Huan;ZHOU Yu;WEI Miaomiao;WANG Yibo;XU Honghua(Institute of Electrical Engineering,Chinese Academy of Science,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院电工研究所,北京市100190 [2]中国科学院大学,北京市100049

出　　处：《电力系统自动化》2022年第14期150-157,共8页Automation of Electric Power Systems

基　　金：中国科学院战略性先导科技专项(A类)资助项目(XDA21050301)。

摘　　要：光伏中压直流汇集并网系统通过中压直流并网变换器实现光伏电能升压汇集。针对中压大功率、大升压比光伏直流变换器技术需求,提出采用基于Boost全桥隔离功率模块输入并联输出串联的模块级联型直流变换器拓扑,实现大功率、高电压、大升压比光伏功率变换功能;针对级联型直流变换器多模块均压、均流问题,提出一种分布式模块均衡控制策略,实现功率模块及变换器的可靠运行。研制了5 kV/80 kW功率模块,搭建了直流变换器实验平台,对提出的拓扑方案及控制策略进行了实验验证;基于14台功率模块研制完成±30 kV/1 MW光伏中压直流并网变换器,建立了±30 kV光伏中压直流汇集并网实证系统,完成了系统实证测试,实现了系统稳定运行。The medium-voltage direct current(MVDC) photovoltaic(PV) collection and grid-connection system realizes the PV power boost collection through the MVDC grid-connected converter. Aiming at the technical requirements of medium-voltage PV DC/DC converter for high power and large step-up ratio, this paper proposes a topology for module-cascaded DC/DC converters based on the Boost full-bridge isolated power module with input-parallel output-series(IPOS) connection, to achieve the PV power conversion function of high power, high voltage and large step-up ratio. Aiming at the problem of multi-module voltage and current equalization of cascaded DC/DC converters, a distributed module equalization control strategy is proposed to realize the reliable operation of power modules and the converter. The 5 kV/80 kW power module has been developed, and the DC/DC converter experimental platform is established to verify the proposed topology and the control strategy. Based on fourteen power modules, a±30 kV/1 MW MVDC PV grid-connected converter has been developed, and a ±30 kV MVDC PV collection and gridconnection system has been established. The empirical test has been completed and the stable operation of the system is realized.

关 键 词：光伏并网变换器 直流变换器 中压直流汇集 大功率 大升压比 输入并联输出串联 模块化设计 

分 类 号：TM46[电气工程—电器] TM615