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The study has focused on: 1 The research background and the current state of the power measurement were analyzed systematically, and then wavelet-based power measurement algorithm was certified feasible for astable signals; 2 We developed a new method of RMS and power measurement based on Dmeyer wavelet. After that three other wavelet measurement approaches were compared with Dmeyer wavelet-based measurement approach. Then the impact on measurement errors of amplitude frequency property and energy leakage of wavelet filter banks were deeply researched, and some measures were proposed to reduce it; 3 We developed a new strategy of power measurement algorithm based on lifting wavelet, which had calculation advantage compared with the first wavelet, so that it was more suitable for the realization of hardware; 4 The running system of wavelet-based power measurement algorithm based on DSP was proposed, and then it was realized on ICETEK-VC5416-A EVM board; 5 Existing problems and the further research direction of wavelet-based power sub-band measurement algorithm was discussed.

本文对基于小波变换的功率测量算法展开深入的分析研究，主要内容有：1）系统地分析了功率分解测量的研究背景、国内外的研究现状，并从能量守恒的角度验证了小波功率分频带测量算法在非平稳信号条件下的可行性；2）首次提出了Dmeyer小波变换有效值与功率的测量方法，进而通过对该方法与3种已经提出的小波测量方法的对比分析，深入研究了小波滤波器组的幅频特性和能量泄漏特性对测量误差的影响，并针对电网谐波的特点提出了减小影响的相关措施；3）首次提出了二代小波功率测量算法，对比一代小波功率分频带测量算法，它大大减少了算法实现的运算量及内存的需求量，从而更适合于硬件的实时实现；4）提出了小波功率分频带测量算法的DSP实现方案，并在ICETEK-VC5416-A EVM板上进行了实现；5）探讨了小波功率分频带测量算法目前仍存在的问题，并提出了进一步的研究方向。

The following exciting results are revealed: 1 When considering the influence of some nonlinear elements such as hard-limit of exciters, the effects of some devices such as Power System Stabilizer and Static Var Compensator which can introduce positive damping in power system, the reasonability of system parameter values in simulation, the SNB surface and HB surface on the boundary of SSSR will turn close to each other and even coalesce together; 2 Under some conditions, coupling between slow exciters and shunt capacitors will bring negative damping in power system dynamics, which increases the possibility of oscillatory instability. So the power system with mass shunt compensators is easily subjected to the oscillatory instability. In recent years, chaotic phenomena of power system have been reported many times. Some simulation studies even found chaos existing inside the power system SSSR. In this dissertation, chaotic phenomena in power systems are thoroughly studied in order to make clear the relation of chaos and SSSR. The following results are derived: 1 Based on Li-Yorke Theorem and their definition on the chaos, the existence of chaos in power system is verified; 2 Three possible routes of causing chaos in power system are found and deeply investigated. They are route of cascading period doubling, route of directly initial energizing and route of torus bifurcation (or quasi-periodicity). The latter two routes are investigated for the first time in power system stability studies; 3 When the stability conditions of chaos are broken, it is found they can lead to voltage collapse, angle divergence, or voltage collapse with angle divergence simultaneously.

针对在电力系统小扰动稳定区域内可能存在混沌吸引域的有关报道，本文深入研究了电力系统混沌现象的出现途径和与系统失稳模式之间的关系：1利用Li-Yorke定理和Li-Yorke的混沌定义，从理论上证明了电力系统混沌现象的存在性；2发现了电力系统中导致混沌出现的三种可能途径：倍周期分岔导致混沌、初始能量直接激发混沌和经由环面分岔导致混沌，并对后两种新发现的途径进行了较为细致的研究；3发现了混沌极限环破裂导致电压崩溃、角度失稳以及电压崩溃和角度失稳同时出现的现象，其中混沌极限环破裂导致系统角度失稳和电压崩溃及角度失稳同时出现的现象均属首次报道；4证明由微分-代数方程描述的系统模型，其小扰动稳定域的边界只包含HB、SNB和SIB三种分岔界面，在SSSR的内部和边界上，均不可能存在会导致混沌的点，从而将混沌现象排除在小扰动稳定域的研究之外，简化了后者的研究工作。

Features of the CCM PFC controller are: built-in brown-out protection, eliminating 12 components; adjustable PFC output, eliminating 17 components; RDY pin for power-on-sequence, eliminating 15 components; 30V operating voltage capability, eliminating 10 components; and PFC soft-start, eliminating 4 components – in total decreasing bill of materials by 54 devices.

CCM PFC控制器的特点有：内置电压过低保护，省去12个组件；可调PFC输出，省去17个组件；用于上电序列的RDY针脚，省去11个组件；30V工作电压能力，省去10个组件；PFC软式启动，省去4个组件，共计可将材料清单中的器件减少54个。

Actually, he was a pretty big dog; he just wasn't very brave. Whenever the three cats would gang up on him, he would try to hide under the bed, but he was too big to hide there.

Power lunch就是有两个或更多的重要人物在一起吃午饭，但是他们并不是像一般朋友那样为了见见面，聊聊天而一起吃午饭；他们是为了谈生意，或其他工作上的事。

I have greasy skin and I need some make up that have a great staying power.

Jennie on June 17， 2007这是我使用的最好的一只眼线笔咯。

Many would use their laptop recharger to charge with their mobil phone power on in travel or to avoid missing any calls.

在旅行中，或者因怕耽误电话，有许多朋友在手机没电时，会使用旅行充电器开着手机充电。

But the conflict between state and religion took different forms; in Christianity it appeared as the struggle for political power on the part of a tightly organized ecclesiastical hierarchy, and canon law was one of its political weapons.

然则，国家和宗教之间的冲突呈现出不同的形态；在基督教中，它表现为由一个组织严密的教会统治集团对政治权力的争夺，而教规法则成为其政治武器之一。

In this sense the strong tendency of magic to become a dream of power - on the importance of this point Lynn Thorndike, Keith Thomas, and C.

在一定意义上，魔法变为一种力量的强烈趋势成了一个很好的方式——Lynn Thorndike， Keith Thomas，和C。

The Family that controlled upper New York State, that arranged smuggling of Italian immigrants from Canada, all upstate gambling and exercised veto power on state licensing of racing tracks, was headed by Ottilio Cuneo.

寇尼奥为首的家族控制着纽约州北部地区，专门安排意大利移民从加拿大愉越国境，进入美国，经营纽约州偏僻地区的赌博业，对州当局决定批准给跑马场颁发许可证的议案行使了否决权。

In the Prussian War of 1870-1871, the son of William 3 World 1 of the German Emperor William 1 World (Germany and the name of people power on) and the re-establishment of the Iron Cross as well as three levels, and body design chapter very small change.

在1870-1871的普法战争中，威廉3世的儿子德国第1位皇帝威廉1世（德国人就和这个名字耗上了）又重新设立了铁十字勋章，也是三个级别，而且章体图案变化也很小。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。