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。
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。
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。
Three methods are discussed to solve the one pursue two problem, they are course method of the initial angular bisector, course method of the instantaneous angular bisector and mid-point path method.
解决一追二问题的方法共讨论了三种：初始角的平分线航向法、瞬时角的平分线航向法、中点轨迹法。
To resolve this problem, this paper designs an algorithm, which consists of three sub-designs they are the single-internal point lost, consecutive-internal points lost and end-points lost.
为解决软件测试丢失数据遗补的问题，构造出了一种算法，包括三种数据丢失情况的处理设计，即单内点丢失、连续几个内点丢失和边界点丢失的遗补方法设计。
However, when examining the same problem in the physical point of view, the motion of the particle can also be described in the three-dimensional coordinates.
但是，当我们从物理的角度审视这一问题时，就会发现可以把这个曲面嵌入一个三维空间中，粒子的运动可以在笛卡儿坐标下分解为三个互相正交的方向。
An existence theorem of positive solution is established for a superlinear second-order three-point boundary value problem. Here, the nonlinear term is bounded below and need not be nonnegative.
建立了超线性二阶三个边值问题的一个正解存在定理。这里，非线性项是下有界的并且不需要是非负的。
By classifying the current methods it point out the existing problem of methods using in financial early warning of information technology industry, and selects three methods to establish models.
通过对当前财务预警方法的归类，总结出目前信息技术业所使用方法存在的问题，并选择本文所采用的三种方法。
By classifying the current methods it point out the existing problem of methods using in financial early warning of information technology industry, and selects three methods to establish models.
通过对当前财务预警方法的归类，总结出目前信息技术业所使用方法存在的问题，并选择本文所采用的三种方法。
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