新型Z源T型五电平逆变器及其调制策略

发布时间：2018-09-09 19:42

【摘要】：针对传统二极管中点钳位三电平与五电平逆变器需要大量钳位二极管、结构复杂、可靠性差、二极管开关损耗较大,以及传统Z源两电平逆变器电容电压应力较高、升压能力不足、功率较低等问题。首先,提出了一种T型五电平逆变器拓扑,该拓扑省去了大量钳位二极管,结构简单,开关损耗小,功率等级高;其次,结合Z源网络与该T型五电平拓扑,得到一种新型Z源T型五电平逆变器拓扑,与传统Z源逆变器相比,在相同的电压增益下,该新型逆变器有效降低了开关器件电压与电容电压;再次,将Z源网络中的电感用升压单元代替,进一步增强了其升压能力;最后,设计了该新型逆变器的同向载波调制策略。仿真实验证明了所提拓扑的正确性与调制策略的有效性。
[Abstract]:A large number of clamped diodes are required for traditional diode neutral-point clamping three-level and five-level inverters, which are characterized by complex structure, poor reliability, high switching loss of diodes, and high capacitance voltage stress of traditional Z-source two-level inverters. Insufficient boost capacity, low power and other problems. Firstly, a T type five-level inverter topology is proposed, which saves a large number of clamped diodes, with simple structure, low switching loss and high power level. Secondly, combining the Z-source network with the T-type five-level topology, A novel Z-source T-type five-level inverter topology is obtained. Compared with the traditional Z-source inverter, the novel inverter can effectively reduce the switching device voltage and capacitance voltage under the same voltage gain. The inductance in the Z source network is replaced by a boost unit, which further enhances its boost capacity. Finally, the codirectional carrier modulation strategy of the new inverter is designed. Simulation results show that the proposed topology is correct and the modulation strategy is effective.
【作者单位】：兰州交通大学自动化与电气工程学院;兰州交通大学光电技术与智能控制教育部重点实验室;
【基金】：甘肃省自然科学基金(1308RJZA116) 兰州交通大学科技支撑计划(ZC2013004)~~
【分类号】：TM464

【相似文献】