文章摘要
马大俊,陈武,薛晨炀,等.低压直流母线AC-DC电力电子变压器及其短路故障穿越方法[J].电力系统自动化. DOI: 10.7500/AEPS20180420002.
MA Dajun,CHEN Wu,XUE Chenyang, et al.Low Voltage DC Bus AC-DC Power Electronic Transformer and Short-circuit Fault Ride-through Strategy[J].Automation of Electric Power Systems. DOI: 10.7500/AEPS20180420002.
低压直流母线AC-DC电力电子变压器及其短路故障穿越方法
Low Voltage DC Bus AC-DC Power Electronic Transformer and Short-circuit Fault Ride-through Strategy
DOI:10.7500/AEPS20180420002
关键词: 电力电子变压器  模块化多电平  全桥型  最近电平逼近  串并联系统  直流短路故障
KeyWords: power electronic transformer  modular multilevel converter  H-bridge  nearest level modulation  series-parallel system  DC short-circuit fault.
上网日期:2018-11-30
基金项目:国家重点研发计划
作者单位E-mail
马大俊 东南大学先进电能变换技术与装备研究所 mdj18769@163.com 
陈武 东南大学先进电能变换技术与装备研究所 chenwu@seu.edu.cn 
薛晨炀 东南大学先进电能变换技术与装备研究所 819043124@qq.com 
伏祥运 国网连云港供电公司 fuxiangyun_2000@163.com 
魏星 南京南瑞继保电气有限公司 weix@nrec.com 
朱卫平 国网江苏省电力有限公司 1660097557@qq.com 
摘要:
      传统的基于半桥型模块化多电平电力电子变压器使用大量的开关器件和源元件,限制了其功率密度和效率的提高。本文提出了一种组合全桥型MMC和输入侧间接串联型ISOP DC-DC变换器的电力电子变压器拓扑,MMC输出等级较低的中压直流母线,可减少隔离级DC-DC模块数量,且可以实现故障时的自阻断功能。通过改变DC-DC变换器模块输入侧的串联连接方式,可有效避免中压直流端口短路时导致DC-DC变换器输入侧电容短路问题。该电力电子变压器拓扑同时具备中压和低压直流端口,且可以有效降低开关器件、源元件、高频变压器以及DC-DC变换器模块数量,提高电力电子变压器的功率密度、效率和故障穿越能力。最后基于MATLAB/SIMULINK,搭建了该电力电子变压器的仿真模型,仿真结果验证了该拓扑的可行性。
Abstract:
      The traditional power electronic transformer based on modular multilevel converter with half bridge submodule uses a large number of switching devices and passive components, which limits its power density and efficiency. A power electronic transformer based on modular multilevel converter with H bridge submodule and ISOP DC-DC converter has been proposed in this paper, which can generate a low level medium voltage DC bus to reduce the number of DC-DC modules, and realize self-blocking when a fault occurs. An indirect series of ISOP converter structure has also been proposed in this paper, when the medium voltage DC port is short-circuited, the short circuit discharge of the input side capacitor of DC-DC converter can be effectively avoided by changing the connection mode of the input side of DC-DC converter. The numbers of switching devices, passive components, high-frequency transformers and DC-DC converter modules can be effectively reduced, and the power density, efficiency and fault ride-through ability can be effectively improved by the proposed power electronic transformer. Finally, the simulation model of the proposed power electronic transformer has been built based on MATLAB/SIMULINK, and the feasibility of this topology is verified by the simulation results.
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