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刘永超,黄勇,李兴,黄波.基于模糊虚拟空间矢量调制的NPC三电平逆变器中点电位平衡的研究[J].电源学报,2018,16(1):61-66
基于模糊虚拟空间矢量调制的NPC三电平逆变器中点电位平衡的研究
Research on Neutral-point Potential of Three-level NPC Inverter Based on Fuzzy Virtual Space Vector Modulation
投稿时间:2016-04-13  修订日期:2017-02-15
DOI:10.13234/j.issn.2095-2805.2018.1.61
中文关键词:  三电平逆变器  中点电位  模糊控制  虚拟空间矢量
英文关键词:three-levelinverter  neutral-point potential  fuzzy control  virtual space vector
基金项目:
作者单位E-mail
刘永超 西华大学电气与电子信息学院, 成都 610039 lyc_sd@yeah.net 
黄勇 西华大学电气与电子信息学院, 成都 610039  
李兴 西华大学电气与电子信息学院, 成都 610039  
黄波 西华大学电气与电子信息学院, 成都 610039  
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中文摘要:
      三电平中点钳位型NPC(neutral-point-clamped)逆变器拓扑结构相比于两电平有能承受高电压、效率高和电磁干扰小等优点,但也存在中点电位不平衡这一固有问题。针对此固有问题,提出了一种新的控制中点电位平衡的方法。该方法是在虚拟空间矢量调制策略的基础上,细分扇区,调整输出电压矢量顺序,增加分配时间的模糊控制因子;冗余小矢量对中点电压的影响可以相互抵消,减少了中矢量的作用时间;通过控制因子合理分配冗余小矢量的作用时间,能有效地控制中点电压偏移。仿真结果验证了该方法的正确性和可行性。
英文摘要:
      Compared with the topology of a two-level inverter, the topology of a three-level neutral-point-clamped (NPC) inverter has obvious advantages, such as resistance to higher voltage, higher efficiency, and less electromagnetic interference. However, the unbalanced potential at the neutral-point is still an inherent problem. Accordingly, a new method for controlling the neutral-point potential is proposed in this paper. Based on the strategy of virtual space vector modulation, the sector is subdivided, the sequences of output voltage vectors are adjusted, and a fuzzy control factor that allocates time is added; the effect of redundant vector pairs on the neutral-point potential can be offset, which reduces the action time of medium vectors; the control factor properly allocates the action time for redundant vector pairs, thus the shift of neutral-point voltage can be efficiently controlled. Simulation results verify the correctness and validity of the proposed method.
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