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。

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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；

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The neutral-point balancing is an inherent problem of the three-level NPC inverter.

中点电位平衡问题是三电平npc逆变器的一个固有问题。

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The problem was that three-point shooting efficiency hasn't historically correlated to the thing Ezekowitz is trying to measure: unlikely success in the NCAA tournament.

WSJ: NCAA Tournament: Harvard Outsmarts Harvard

But Wyeth's troubles point out the problem with this strategy, too, because two of its three setbacks--the two announced today--both come from products it licensed from other companies.

FORBES: Wyeth's Worries