基于开关电感的增强型Z源三电平逆变器

发布时间：2018-12-23 09:15

【摘要】：分析了基于空间矢量脉宽调制(SVPWM)的常规单z源三电平中点钳位(NPC)逆变器的升压能力,指出若直通矢量作用时间不超过某一有效矢量的作用时间,则逆变器的电压增益最大值仅为1.15,不具备升压能力。对SVPWM方法作出修改,使电压增益与z源两电平逆变器的相同。为了进一步提高升压能力,提出一种增强型z源网络,直流母线的正端和负端各引入1个开关电感(SL)单元,不仅提高电压增益,而且在相同电压增益的条件下降低了在z源网络电容的电压应力,还能实现中点电位平衡。在此基础上又提出了升压能力更强的多单元开关电感增强型z源网络。仿真结果表明,改进SVPWM方法和新型拓扑对提高z源三电平NPC逆变器的升压能力十分有效。
[Abstract]:In this paper, the boost capacity of conventional single-z source three-level neutral-point clamped (NPC) inverter based on space-vector pulse width modulation (SVPWM) is analyzed. It is pointed out that if the action time of a direct vector does not exceed that of an effective vector, The maximum voltage gain of the inverter is only 1.15, which does not have the ability to boost voltage. The SVPWM method is modified so that the voltage gain is the same as that of the z source two level inverter. In order to further improve the boost capacity, an enhanced z source network is proposed, in which one switching inductor (SL) unit is introduced at the positive and negative ends of the DC bus, which not only improves the voltage gain, but also increases the voltage gain. Under the same voltage gain condition, the voltage stress of the capacitor in the z source network is reduced, and the midpoint potential balance can be realized. On the basis of this, a multi-unit switching inductance enhanced z source network with better boost capacity is proposed. The simulation results show that the improved SVPWM method and the new topology are very effective to improve the boost capacity of the z-source three-level NPC inverter.
【作者单位】：广州大学机械与电气工程学院;
【基金】：广州市科技计划项目(2013J4100017) 广州市属高校科研计划项目(2012A034) 广东省高等学校高层次人才项目(2050205-194)
【分类号】：TM464

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