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POwer

POwer函数的主要作用是返回给定数字的乘幂。POwer函数的语法为:POwer(number,POwer),其中参数number表示底数;参数POwer表示指数。两个参数可以是任意实数,当参数POwer的值为小数时,表示计算的是开方;当参数number取值小于0且参数POwer为小数时,POwer函数将返回#NUM!错误值。[1]
  • Electric+Vehicles+on+POwer+System

    With the rapid development of electric vehicles (EVs) as well as the promotion and application of vehicle-to-grid (V2G) technologies, EVs charging loads, as flexible loads, have the potential to participate in the grid services, including peak shaving and valley filling, frequency regulation (FR), emergency POwer, energy market participation, and so on. Therefore, great attention has been paid to EVs and V2G. Focusing on the interactions between EVs and POwer system, this book aims to bring readers with basic knowledge of electrical engineering promptly to the frontier of the EVs’ influence on POwer system and environment. This book may serve as a reference for scientists, electrical engineers, and postgraduate students majoring in electrical engineering or other related fields.

    标签: Electric Vehicles System POwer on

    上传时间: 2020-06-07

    上传用户:shancjb

  • Electrical+POwer+Engineering+Current+State

    The author of this textbook intends to consider all stages of the life cycle of the energy resources: extraction of mineral energy resources and mastering for POwer engineering renewable energy, transportation of mineral energy raw materials to the place of consumption, the conversion of primary energy sources into electrical and/or thermal energy, transportation and distribution among the customers, and energy storage (if necessary).

    标签: Engineering Electrical Current POwer State

    上传时间: 2020-06-07

    上传用户:shancjb

  • Parallel POwer Electronics Filters

    POwer Electronics is one of modern and key technologies in Electrical and Electronics Engineering for green POwer, sustainable energy systems, and smart grids. Especially, the transformation of existing electric POwer systems into smart grids is currently a global trend. The gradual increase of distributed generators in smart grids indicates a wide and important role for POwer electronic converters in the electric POwer system, also with the increased use of POwer electronics devices (nonlinear loads) and motor loadings, low cost, low-loss and high-performance shunt current quality compensators are highly demanded by POwer customers to solve current quality problems caused by those loadings.

    标签: Electronics Parallel Filters POwer

    上传时间: 2020-06-07

    上传用户:shancjb

  • POwer Electronics Handbook, 3 Edition

    There have been many developments in the field of POwer electronics since the  publication of  the  second edition, almost  five  years  ago. Devices have become  bigger and better  -  bigger silicon die, and current and voltage ratings. However, semiconductor devices have also  become  smaller and better, integrated circuit devices, that is. And  the  marriage of low POwer integrated circuit tecnology and high POwer semiconductors has resulted in benefit to both fields.

    标签: Electronics Handbook Edition POwer

    上传时间: 2020-06-07

    上传用户:shancjb

  • POwer Over Ethernet

    December 2007, San Jose, California: It seems a long time ago. I walked into a big networking company to head their small POwer over Ethernet (PoE) applications team. Surprisingly, I hardly knew anything about PoE prior to that day, having been a switching-POwer conversion engineer almost all my life. But it seemed a great opportunity to widen my horizons. As you can see, one notable outcome of that seemingly illogical career choice five years ago is the book you hold in your hands today. I hope this small body of work goes on to prove worthy of your expectations and also of all the effort that went into it. Because, behind the scenes, there is a rather interesting story to relate—about its backdrop, intertwined with a small slice of modern PoE history, punctuated by a rather res- tive search for our roots and our true heroes, one that takes us back almost two centuries

    标签: Ethernet POwer Over

    上传时间: 2020-06-07

    上传用户:shancjb

  • POwer System Stability Modelling

    Modern day large POwer systems are essentially dynamic systems with stringent requirements of high reliability for the continuous availability of electricity. Reliability is contingent on the POwer system retaining stable operation during steady-state operation and also following disturbances. The subject of POwer sys- tem stability has been studied for many decades. With new developments, and there have been many over the past couple of decades, new concerns and problems arise that need to be studied and analysed. The objective of this book is a step in that direction though not ignoring the conventional and well-established approaches.

    标签: Modelling Stability System POwer

    上传时间: 2020-06-07

    上传用户:shancjb

  • POwer+Electronic+Modules+Design+Manufacture

    A POwer semiconductor module is basically a POwer circuit of different materials assembled together using hybrid technology, such as semiconduc- tor chip attachment, wire bonding, encapsulation, etc. The materials involved cover a wide range from insulators, conductors, and semiconduc- tors to organics and inorganics. Since these materials all behave differently under various environmental, electrical, and thermal stresses, proper selec- tion of these materials and the assembly processes are critical. In-depth knowledge of the material properties and the processing techniques is there- fore required to build a high-performance and highly reliable POwer module.

    标签: Manufacture Electronic Modules Design POwer

    上传时间: 2020-06-07

    上传用户:shancjb

  • Smart+POwer+Grids

    The electrical POwer grid is often referred to as one of the most complex man- made systems on Earth. Its importance to all aspects of our daily lives, economic stability, and national security cannot be overstated, and the need for an updated, secure, resilient, and smarter POwer grid infrastructure is increasingly recognized and supported by policy makers and market forces.

    标签: Smart POwer Grids

    上传时间: 2020-06-07

    上传用户:shancjb

  • Switch Mode POwer Supplies

    For many years prior to the 1970s, engineers designed and built switch mode POwer supplies (SMPSs) using methods based largely on intuitive and exper- imentally derived techniques. In general, these POwer supplies were able to achieve their primary goal of high-efficiency POwer conversion; unfortu- nately, due to the lack of adequate theoretical analysis techniques, many of these POwer supplies only marginally met their desired performance require- ments. In many cases, they were considered to be unreliable. 

    标签: Supplies Switch POwer Mode

    上传时间: 2020-06-07

    上传用户:shancjb

  • Switch-Mode POwer Supply Simulation

    Thepredecessorvolumeofthisbookwaspublishedin1996.Intheyears since then, some things have changed and some have not. Two of the things that have not changed are the desire for better models and faster simulations. I performed the original simulations on my “hyperfast” 133-MHz computer! At the time, I thought if I could just getafastercomputer,allofourSPICEproblemswouldbehistory,right? TodayIamsimulatingonacomputerthathasa2.6-GHzprocessorwith 512 MB of RAM, and I would still say that simulations run too slow. The computer technology has evolved, but so have the models. In 1996 wewereperformingsimulationson100-kHzPOwerconverters,whereas today I routinely see 1- and 2-MHz POwer converters.

    标签: Switch-Mode Simulation Supply POwer

    上传时间: 2020-06-07

    上传用户:shancjb