电工技术学报  2018, Vol. 33 Issue (16): 3719-3731    DOI: 10.19595/j.cnki.1000-6753.tces.180392
模块化多电平换流技术及其应用专题 |
网压不平衡下环流注入对模块化多电平换流器的影响分析
施恩泽1, 吴学智1, 荆龙1, 姜久春1,2, 李金科2
1. 北京交通大学国家能源主动配电网技术研发中心 北京 100044;
2. 北京电动车辆协同创新中心 北京 100042
Analysis of the Impact on Modular Multilevel Converter with Circulating Current Injection under Unbalanced Grid Voltage
Shi Enze1, Wu Xuezhi1, Jing Long1, Jiang Jiuchun1,2, Li Jingke2
1. National Active Distribution Network Technology Research Center Beijing Jiaotong University Beijing 100044 China;
2. Collaborative Innovation Center of Electric Vehicles in Beijing Beijing 100042 China
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摘要 在网压不平衡工况下,采用开关函数、三维图分析及函数拟合的方法,给出合理的环流注入策略,实现模块化多电平换流器(MMC)桥臂电流峰值、模块电压波动的降低。分析环流注入对桥臂电流峰值、有效值以及模块电压波动的影响,得出环流注入降低桥臂电流峰值的最佳相位与不同工况下注入环流幅值的限定公式,以及环流注入降低模块电压波动的最佳相位及其注入幅值的限定公式。综合考虑桥臂模块电流、电压耐受能力后,提出一种可以实现桥臂电流峰值限定及模块电压波动限幅的环流注入控制方法。最后通过Matlab/Simulink仿真与实验平台验证了理论分析的正确性以及提出方法的有效性。
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关键词 模块化多电平换流器网压不平衡环流注入桥臂电流子模块电压    
Abstract:Based on the switching function, the 3D-graph analysis and the fitting method, this paper proposes a reasonable circulating current injection method to reduce the peak value of arm current and the capacitor voltage ripple of the module under unbalanced grid voltage. The impacts of circulating current injection on the peak value and root mean square value of the arm current as well as the capacitor voltage ripple are analyzed. The best angle to minimize the peak value of arm current and the formula to limit circulation injection amplitude under different conditions are obtained, and the best angle to minimize the capacitor voltage ripple and its limited formula of amplitude are further obtained. Considering the tolerance of current and voltage in sub module, a circulating current injection method is proposed, which can limit peak value of arm current as well as the capacitor voltage ripple. Finally, the correctness of the analysis and the effectiveness of the proposed method are verified in Matlab/Simulink simulation and the experimental platform.
Key wordsModular multilevel converter (MMC)    unbalanced grid voltage    circulating current injection    arm current    capacitor voltage ripple   
收稿日期: 2018-03-22      出版日期: 2018-09-03
PACS: TM46  
基金资助:国家重点研发计划资助项目(2016YFB0900500)
通讯作者: 吴学智 男,1975年生,副教授,博士生导师,研究方向为新能源接入与并网发电技术。E-mail: xzhwu@bjtu.edu.cn   
作者简介: 施恩泽 男,1993年生,硕士研究生,研究方向为模块化多电平变流器的控制策略。E-mail: 16121512@bjtu.edu.cn
引用本文:   
施恩泽, 吴学智, 荆龙, 姜久春, 李金科. 网压不平衡下环流注入对模块化多电平换流器的影响分析[J]. 电工技术学报, 2018, 33(16): 3719-3731. Shi Enze, Wu Xuezhi, Jing Long, Jiang Jiuchun, Li Jingke. Analysis of the Impact on Modular Multilevel Converter with Circulating Current Injection under Unbalanced Grid Voltage. Transactions of China Electrotechnical Society, 2018, 33(16): 3719-3731.
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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.180392          https://dgjsxb.ces-transaction.com/CN/Y2018/V33/I16/3719