Two methods to control the neutral point potential are proposed in this thesis which can solve the neutral point potential problem owned by three-level inverter.
针对三电平逆变器固有的中点电位平衡问题，本文提出并分析了两种能控制中点电位平衡的控制策略。
2
It posed conception of three big sustaining systems in wheat production and , baste on the point of cantact , deeply analysed profound problem in Shanxi wheat production .
提出了小麦生产“三大支撑体系”的概念，并以此为切入点，深刻分析了山西小麦生产存在的深层次问题；
3
The neutral-point balancing is an inherent problem of the three-level NPC inverter.