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薛尧,杨晓峰,陈博伟,林智钦,郑琼林.基于改进型单极全桥子模块的新型MMC[J].电源学报,2018,16(1):1-7
基于改进型单极全桥子模块的新型MMC
New MMC Based on Modified Unipolar Full-bridge Sub-module
投稿时间:2016-05-10  修订日期:2017-03-20
DOI:10.13234/j.issn.2095-2805.2018.1.1
中文关键词:  模块化多电平换流器  改进型单极全桥子模块  直流侧故障穿越  串联电阻
英文关键词:modular multilevel converter (MMC)  modified unipolar full-bridge sub-module  DC fault ride-through  series resistance
基金项目:中央高校基本科研业务费专项资金资助项目(E16JB00080)
作者单位E-mail
薛尧 北京交通大学电气工程学院, 北京 100044 14121489@bjtu.edu.cn 
杨晓峰 北京交通大学电气工程学院, 北京 100044  
陈博伟 北京交通大学电气工程学院, 北京 100044  
林智钦 北京交通大学电气工程学院, 北京 100044  
郑琼林 北京交通大学电气工程学院, 北京 100044  
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中文摘要:
      提出了一种改进型的单极全桥子模块结构MUFBSM(modified unipolar full bridge sub module),其本质是在单极全桥子模块结构UFBSM(unipolar full bridge sub module)的二极管支路添加一个串联电阻。系统正常工作时,MUFBSM不会增加额外的损耗;当系统检测到直流侧故障并闭锁后,MUFBSM中的串联电阻接入故障电流通路,增强了故障回路的阻尼效果并消耗部分系统储存能量,加快了故障电流清除速度,降低了子模块电容电压上升幅值。然后分析了UFBSM和MUFBSM混合型模块化多电平变换器的故障机理,分析了串联电阻的取值依据。Matlab/Simulink仿真结果验证了MUFBSM的可行性和有效性。
英文摘要:
      In this paper, a modified unipolar full-bridge sub-module(MUFBSM) is proposed by adding a series res-istance to the diode branch of unipolar full-bridge sub-module(UFBSM). When the system is in a normal operation state, MUFBSM will not generate extra power loss; when a DC fault is detected and MUFBSMs are thus blocked, the series resistance will be connected to the fault current path and provide a higher damping effect on the fault current loop, which dissipates part of the initial energy storage of the system. Therefore, the fault current will fall into zero immediately, and the amplitude of capacitor voltage rising in the sub-module is limited. The fault mechanisms of a hybrid modular multilevel converter(HMMC) with UFBSMs and MUFBSMs are analyzed, together with the evaluation on the values of series resistance. Simulation results in Matlab/Simulink validate the feasibility and effectiveness of MUFBSM.
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