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Through the analysis of the work principle of three phases voltage resource PWM converter, set up the low and high mathematic models, deduce the restriction equations about grid voltage, grid current, modulation voltage and the DC output voltage and the calculation equations of the AC-side inductance and the DC-side capacitance. There are two control strategies are adopted: Predicted current control strategy and voltage-current two closed-loop control strategy, and give a comparison by theory and practice.

通过分析三相电压源型PWM变换器的工作原理，分别分析了低频和高频数学模型，并推导出了交流侧电压电流、调制电压、直流侧电压之间的数学约束关系以及交流侧电感和直流支撑电容参数的选取依据公式；分析对比了两种控制策略：预测电流控制和电压电流双闭环控制并加以实验验证；同时采用了负载电流前馈补偿和本文提出的一种基于专家系统的神经元新型智能PI控制器两种方法大大提高了整个系统的动态响应性能，并在仿真和实验中加以验证，这也是本文研究的重点内容之一。

If you see a doctor leaving a house , you may deduce that someone in the house is ill .

如果你看见一个医生从某一家出来，你就可以推知这家有人病了。

From seeing a doctor leaving a house, you may deduce that someone in the house is ill.

从看见一个医生从一处住所出来，你就可以推断这一家有人生病了。

If you see a doctor leave a house, you may deduce the fact that someone in the house is ill.

假如你看见一个医生离开一家人家，你就可以推想那家里有人病了。

If you see a doctor leav in g a house, you may deduce that someone in the house is ill.

如果你看见一个医生从某家出来，你就可以推知这家有人病了。

If you saw a doctor leaving a house you might deduce the fact that someone in the house was ill.

如果你看见一个医生离开一个人家，你就可以推想那家里有人生病了。

If you saw a doctor leaving a house, you might deduce the fact that someone in the house was ill.

假如你看见一个医生离开一个人家，你就可以推想那家里有人生病。

Eg: If you saw a doctor leaving a house you might deduce the fact that someone in the house was ill.

如果你看见一个医生离开一个人家，你就可以推想那家里有人生病了。

Puzzle game where you have to deduce the location of mirrors in a black box by firing lase..

益智游戏，你要演绎镜子的地点发射酶。。

We deduce the basic differential equation of light spreading in photonic crystal and the theory of one dimensional optical transfer matrix from the Maxwell's equation in chapter Ⅱ.

第二章从麦克斯韦方程出发，推导了光在光子晶体中传播的基本微分方程和一维光学传输矩阵理论。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。