一种基于桥臂耦合电感的自然限流型模块化多电平换流器  

Arm Coupling Inductor Based Natural Current Limiting Modular Multilevel Converter

作　　者：王有云 杨晓峰[2] 李泽杰 薛尧[2] 陈博伟[2] Wang Youyun;Yang Xiaofeng;Li Zejie;Xue Yao;Chen Bowei(Tianshui Electric Drive Research Institute Co. Ltd Tianshui 741020 China;School of Electrical Engineering Beijing Jiaotong University Beijing 100044 China)

机构地区：[1]天水电气传动研究所有限责任公司,天水741020 [2]北京交通大学电气工程学院,北京100044

出　　处：《电工技术学报》2018年第A02期479-488,共10页Transactions of China Electrotechnical Society

基　　金：大型电气传动系统与装备技术国家重点实验室开放基金(SKLLDJ042016005);国家重点研发计划(2016YFE0131700)资助项目

摘　　要：环流、直流电流波动和直流侧故障电流抑制问题是模块化多电平换流器(MMC)发展过程中面临的重要难点,为增强系统对三者的抑制效果,提出一种基于桥臂耦合电感的自然限流型多电平换流器(ACINCL-MMC)。首先分析ACINCL-MMC的工作原理,在建立其交直流侧数学模型的基础上,研究桥臂电感耦合程度与环流、直流电流波动和直流侧故障电流的关系,详细地剖析桥臂耦合电感的自然限流作用,并进一步探讨桥臂耦合电感取代直流平波电抗的可行性。最后,仿真和实验结果验证了所提理论的有效性。The circulating current,the DC current fluctuation and DC fault current suppressing are important issues for modular multilevel converter(MMC).In order to enhance the suppressing effect of the system on the above three,the arm coupling inductor based natural current limiting MMC(ACINCL-MMC)is proposed in this paper.The operation principle analysis of ACINCL-MMC is carried out firstly.Based on the mathematical modeling of both the AC side and DC side,the relationship between the arm inductor coupling degree and the circulating current,the DC current fluctuation and the DC fault current is studied.The natural current limiting effect of arm coupling inductor is analyzed in detail.Moreover,it further reveals the possibility of using arm coupling inductor instead of DC smoothing reactance.Finally,simulation results show the effectiveness of the proposed theory.

关 键 词：模块化多电平换流器 桥臂耦合电感 自然限流 环流 故障电流 

分 类 号：TM76[电气工程—电力系统及自动化]