Leakage Current Suppression and Balance Control of Neutral Point Potential for Three-level Transformerless Inverter

被引：0
|
作者：
Qiu J. [1 ]
He Y. [1 ]
Jiao Q. [1 ]
Liu J. [1 ]
机构：
[1] School of Electrical Engineering, Xi'an Jiaotong University, Xi'an
来源：
Dianli Xitong Zidonghua/Automation of Electric Power Systems | 2021年 / 45卷 / 17期
基金：
中国国家自然科学基金;
关键词：
Common-mode voltage; Leakage current suppression; Neutral point potential control; Space vector pulse width modulation; Three-level inverter;
D O I：
10.7500/AEPS20200810002
中图分类号：
学科分类号：
摘要：
In view of the leakage current and the imbalance of the neutral point potential of the neutral point clamped (NPC) three-level inverter in the grid-connected photovoltaic system, the mechanism of the leakage current and the factors affecting the neutral point potential are analyzed in this paper. Aiming at the shortcomings of existing modulation strategies, based on the existing modulation strategy, the modulation sector with the traditional modulation strategy is re-divided. On this basis, suitable switching sequences are selected, and a new type of large medium and small vector modulation strategy is obtained. The modulation strategy proposed in the paper has low variation amplitude of common-mode voltage, high variation amplitude of DC voltage, low total harmonic distortion ratio of the output voltage, and it can effectively control the neutral point potential. Finally, through simulation and experiments, the proposed strategy is compared with the traditional modulation strategy in terms of leakage current suppression and neutral point potential control, and the effectiveness of the proposed modulation strategy is verified. © 2021 Automation of Electric Power Systems Press.
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收藏
页码：161 / 170
页数：9
相关论文
共 25 条
  • [1] GUO Leilei, JIN Nan, LI Yanyan, Et al., Virtual vector based model predictive common-mode voltage reduction method for voltage source inverters, Transactions of China Electrotechnical Society, 35, 4, pp. 839-849, (2020)
  • [2] GUO Xiaoqiang, WANG Xuehui, YANG Yong, Et al., Leakage current attenuation of three-phase six-switch three-level photovoltaic inverter, Transactions of China Electrotechnical Society, 33, 14, pp. 3255-3263, (2018)
  • [3] KEREKES T, TEODORESCU R, LISERRE M, Et al., Evaluation of three-phase transformerless photovoltaic inverter topologies, IEEE Transactions on Power Electronics, 24, 9, pp. 2202-2211, (2009)
  • [4] WANG Fusheng, LI Zhen, FU Hang, Et al., A new pulse-width modulation algorithm for the comprehensive neutral-point balancing and leakage current reducing in the three-level transformerless inverter, Transactions of China Electrotechnical Society, 32, pp. 128-138, (2017)
  • [5] LEE J S, LEE K B., New modulation techniques for a leakage current reduction and a neutral-point voltage balance in transformerless photovoltaic systems using a three-level inverter, IEEE Transactions on Power Electronics, 29, 4, pp. 1720-1732, (2014)
  • [6] YIN Jingyuan, ZHOU Bing, Open-end winding motor field-weaken control strategy of dual 3L-neutral point clamped based on back-electromotive force harmonic voltage, Transactions of China Electrotechnical Society, 32, 10, pp. 174-181, (2017)
  • [7] XU Zhixian, WANG Zheng, WANG Xueqing, Et al., A predictive current control method for a T-type three-level dual three-phase PMSM with zero common-mode voltage, Proceedings of the CSEE, 40, 13, pp. 4301-4310, (2020)
  • [8] CHEN Pengfei, TANG Fen, WU Xuezhi, Et al., Self-balancing characteristic analysis of neutral point potential and improved topology of three-level grid-connected converter, Automation of Electric Power Systems, 43, 24, pp. 171-180, (2019)
  • [9] WANG Ping, QI Yin, ZHANG Yun, Co-inhibition method of common mode voltage and neutral point potential fluctuation for NPC three-level inverter, Proceedings of the CSU-EPSA, 30, 10, pp. 28-33, (2018)
  • [10] XIAO Huafeng, WANG Xiaobiao, ZHANG Xing, Et al., State-of-the-art and future trend of transformerless photovoltaic grid-connected inverters, Proceedings of the CSEE, 40, 4, pp. 1038-1054, (2020)
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