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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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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By using the fixed point theory and a new three-solution theorems, the existence of multiple solutions of the boundary value problem was obtained.

通过利用不动点指数理论及一个新的三解定理，得到了边值问题多个正解的存在性。

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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