基于固态变压器的移动变电站综合性能提升方法  

Improving the Comprehensive Performance of Mobile Substation Based on Solid State Transformer

作　　者：高美金 狄谦 王婷婷 黄江倩 孟凡刚[3] Gao Meijin;Di Qian;Wang Tingting;Huang Jiangqian;Meng Fangang(State Grid Zhejiang Electric Power Co.,Ltd Hangzhou 310000 China;Henan Pinggao Electric Co.Ltd,Pingdingshan 467001 China;School of Electrical Engineering Harbin Institute of Technology,Harbin 150001 China)

机构地区：[1]国网浙江省电力有限公司经济技术研究院,杭州310000 [2]河南平高电气股份有限公司,平顶山467001 [3]哈尔滨工业大学电气工程学院,哈尔滨150001

出　　处：《电工技术学报》2021年第11期2315-2324,共10页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(51777042)。

摘　　要：为减小移动变电站中主变压器的体积和质量,提高移动变电站的高压侧电能质量,提出一种用于移动变电站的固态变压器拓扑。所提出的固态变压器由AC-AC变换器、高频多脉波整流器、工频逆变器三部分组成,该文首先分析了AC-AC变换器的工作原理,并从降低开关损耗的角度出发,设计其控制策略;然后从磁路和电路对称的角度出发,设计用于高频多脉波整流器的移相变压器,并应用开关函数法计算固态变压器的输入电流和输出电压;最后设计固态变压器中AC-AC变换器的控制和驱动电路,搭建了移动变电站的缩比仿真和实验平台。仿真和实验结果表明,使用固态变压器代替传统的工频主变压器后,主变压器体积减小了三分之二,其体积和质量得到显著降低;使用所设计的三相五芯柱变压器作为移相变压器后,固态变压器的输入电流总谐波畸变率(THD)值由22%降到了16%,有效提高了移动变电站的电能质量。In order to reduce the volume and weight of the main transformer,and to improve the input power quality of mobile substation,this paper proposes a solid state transformer topology used in the mobile substation.The proposed mobile substation comprises a AC-AC converter,high-frequency multi-pulse rectifier,and a line-frequency inverter.The operating principle of the AC-AC converter is analyzed,and its control strategy is designed from reducing its switching losses.The phase-shifting transformer used in the high-frequency multi-pulse rectifier is designed from the symmetry of magnetic and electric circuit,and the input current and output voltage of the solid state transformer are also calculated based on the switching function.The control and drive circuit of the AC-AC converter is designed,and the scaling simulation and experimental platform is also setup.The simulation and experimental results show that volume of the main transformer reduced to 1/3 of that of the line frequency transformer under the same kV·A rating;after using the phase-shifting transformer,the THD of the input line current decreases from 22%to 16%.

关 键 词：移动变电站 固态变压器 AC-AC变换器 高频多脉波整流器 移相变压器 

分 类 号：TM933[电气工程—电力电子与电力传动]