单相MMC高压直流变压器拓扑及控制策略  

Topology and control strategy for single-phaseMMC high-voltage DC transformers

作　　者：焦鑫艳[1] 朱海勇 殷子寒 卞亦飞 裘鹏 张雪垠 JIAO Xinyan;ZHU Haiyong;YIN Zihan;BIAN Yifei;QIU Peng;ZHANG Xueyin(NR Electric Co.,Ltd.,Nanjing Jiangsu 211102,China;Power Science Research Institute,State Grid Zhejiang Electric Power Co.,Ltd.,Hangzhou Zhejiang 310014,China;Tsinghua Sichuan Energy Internet Research Institute,Chengdu Sichuan 610200,China)

机构地区：[1]南京南瑞继保电气有限公司,江苏南京211102 [2]国网浙江省电力有限公司电力科学研究院,浙江杭州310014 [3]清华四川能源互联网研究院,四川成都610200

出　　处：《宁夏电力》2025年第1期1-7,22,共8页Ningxia Electric Power

基　　金：国家重点研发计划项目(2023YFB2405900)。

摘　　要：针对新能源经高压交流输电存在损耗高,而经柔性直流输电又存在宽频振荡的问题,提出一种单相模块化多电平换流器(modular multilevel converter,MMC)的高压直流变压器拓扑,可有效满足新能源系统的接入及送出。该拓扑高压侧、中压侧均采用单相MMC结构,并采用400 Hz中频变压器进行电气隔离。针对单相MMC单一电流电压特性,提出一种虚拟dq分量的矢量控制方法,实现高压侧、中压侧解耦控制。并针对单相MMC的二倍频环流问题,提出一种基于谐振控制器的二倍频环流抑制方法。最后,进行了稳态及环流抑制仿真实验,实验结果表明所提拓扑及控制策略的正确性。This paper presents the architecture of a high-voltage DC transformer that uses a single-phase modular multilevel converter(MMC)to reduce significant energy losses in high-voltage AC transmission and address the issue of wide-frequency oscillations in flexible DC transmission.This design effectively supports the integration and distribution of renewable energy technologies.Both the high-voltage and medium-voltage sides use a single-phase MMC configuration,with a 400 Hz medium-frequency transformer for electrical isolation.A vector control technique using virtual dq components is employed to enable decoupling control between the high-voltage and medium-voltage sides in the view of single current-voltage characteristic of the single-phase MMC.A suppression method using a resonant controller is deve-loped to reduce double-frequency circulating currents in the single-phase MMC.Finally,simulations of steady-state operation and circulating current suppression are conducted,and the results confirm the effectiveness of the proposed topology and control strategy.

关 键 词：单相模块化多电平换流器 直流变压器 环流抑制 

分 类 号：TM41[电气工程—电器]