Freewheeling clamp type three-phase inverter for leakage current suppression

被引：0
|
作者：
Ma H.-X. [1 ]
Zhang X.-F. [1 ]
机构：
[1] College of Automation, Nanjing University of Posts and Telecommunications, Nanjing
来源：
Dianji yu Kongzhi Xuebao/Electric Machines and Control | 2020年 / 24卷 / 11期
关键词：
Clamp; Common mode voltage; Freewheeling; Leakage current; Non-isolated type; Three-phase inverter;
D O I：
10.15938/j.emc.2020.11.012
中图分类号：
学科分类号：
摘要：
In order to reduce the leakage current of three-phase non-isolated photovoltaic inverter system, a freewheel clamp type three-phase non-isolated photovoltaic inverter is proposed. The topology added a freewheeling switch on the AC side of a conventional three-phase non-isolated photovoltaic inverter, and the freewheeling switch was composed of a switching tube and a three-phase uncontrolled rectifier bridge in parallel. At the same time, three clamp capacitors were introduced on the DC side of the inverter to divide the input voltage into four potential points of 0, 1/3, 2/3 and 1 and two clamp switches were added at 1/3 and 2/3 potential points. The inverter common mode voltage can be clamped at 1/3 or 2/3 of the DC input voltage during the entire inverter cycle to reduce the ripple of the common mode voltage, thereby reducing system leakage current. For this new topology, the logic control signal of the inverter was constructed by using the relationship between the common mode voltage and the switch state. A prototype with an output of 200 W per phase was designed, and the correctness of the theoretical analysis was verified by simulation and experiment. © 2020, Harbin University of Science and Technology Publication. All right reserved.
引用
收藏
页码：102 / 109
页数：7
相关论文
共 19 条
  • [1] ZHANG Xing, SHAO Zhangping, WANG Fusheng, Et al., Common mode current suppression of non-isolated three-phase three-level photovoltaic inverters, Proceedings of the CSEE, 33, 3, (2013)
  • [2] Gonzalez R, Gubia E, Lopez J, Et al., Transformerless single-phase multilevel-based photovoltaic inverter, IEEE Transactions on Industrial Electronics, 55, 7, (2008)
  • [3] JIANG Yanzhen, XU Dianguo, Research on output common mode voltage of PWM inverter and its suppression technology, Proceedings of the CSEE, 25, 9, (2005)
  • [4] KIM H J, LEE H D, SUL S K., A new PWM strategy for common-mode voltage reduction in neutral-point-clamped inverter-fed AC motor drives, IEEE Transactions on Industry Applications, 37, 6, (2001)
  • [5] XUE Y, CHANG L, KJAER S B, Et al., Topologies of single-phase inverters for small distributed power generators: an overview, IEEE Transactions on Power Electronics, 19, 5, (2004)
  • [6] CAI Chunwei, GUO Yuxing, AN Pufeng, Et al., A neutral point voltage ripple inhibition topology for three-phase four-wire inverter, Electric Machines and Control, 22, 2, (2018)
  • [7] KJAER S B, PEDERSEN J K, BLAABJERG F., A review of single-phase grid-connected inverters for photovoltaic modules, IEEE Transactions on Industry Applications, 41, 5, (2005)
  • [8] BLAABJERG F, CHEN Z, KJAER S B., Power electronics as efficient interface in dispersed power generation systems, IEEE Transactions on Power Electronics, 19, 5, (2004)
  • [9] CARRASCO J M, FRANQUELO L G, BIALASIEWICZ J T, Et al., Power-electronic systems for the grid integration of renewable energy sources: a survey, IEEE Transactions on Industrial Electronics, 53, 4, (2006)
  • [10] LI Zhijun, XI Wenxia, ZHANG Zikun, Parallel resonant photovoltaic grid-connected system with high step-up ratio, Electric Machines and Control, 23, 2, (2019)
12