面向中高压智能配电网的电力电子变压器研究  

Research on Medium- and High-Voltage Smart Distribution Grid Oriented Power Electronic Transformer

作　　者：李子欣[1] 王平[1] 楚遵方[1] 朱海滨[1] 李耀华[1] 

机构地区：[1]中国科学院电力电子与电气驱动重点实验室(中国科学院电工研究所),北京市海淀区100190

出　　处：《电网技术》2013年第9期2592-2601,共10页Power System Technology

基　　金：国家自然科学基金项目(51207151);中国科学院知识创新工程重要方向项目(Y180131C31)的资助~~

摘　　要：分析了电力电子变压器(power electronic transformer,PET)的国内外研究现状,以及面向中高压电网的已有PET拓扑的特点。在此基础上,基于模块化多电平变流器(modular multilevel converter,MMC),提出了面向中高压智能配电网PET的一种新型拓扑。与传统的PET电路拓扑相比,新型拓扑的优势在于其可以减少电力电子开关器件的数量;更重要的是,可以显著减少高频变压器的数量,具有更好的体积及重量优势。同时,分析了该拓扑PET的工作机制及不同电能转换环节的控制策略设计方法。10 kV/380 V配电网用PET样机上的仿真及试验结果表明了所提拓扑及其控制策略的可行性。The progress of the research on power electronic transformer （PET） home and abroad is reviewed and the features of the existing PET circuit topologies oriented to medium- and high-voltage power girds are analyzed, Based on these analyses and taking advantage of the modular multilevel converter （MMC）, a new type of PET topology oriented to medium- and high-voltage smart distribution grid is proposed. Compared with the existing topologies, the proposed circuit can reduce the number of the power switches. What is more important, the proposed topology can reduce the number of the high-frequency transformers substantially. Thereby, the presented PET topology is superior to the existing circuits in terms of volume and weight. Meanwhile, the operation mechanism of the proposed PET and the control strategy design methods for the different electric energy conversion stages are presented. Simulation and experimental results on a PET prototype oriented to 10kV/380V distribution grid show that the proposed circuit topology and its control strategy are feasible and effective.

关 键 词：智能电网 配电网 电力电子变压器 模块化多电 平变流器 

分 类 号：TM721[电气工程—电力系统及自动化]