Benefits of Series Compensation in Long Transmission System

ＢｅｎｅｆｉｔｓｏｆＳｅｒｉｅｓＣｏｍｐｅｎｓａｔｉｏｎｉｎＬｏｎｇＴｒａｎｓｍｉｓｓｉｏｎＳｙｓｔｅｍＸ．Ｚ．Ｌｅｉ,Ｄ．ＰｏｖｈＳＩＭＥＮＳＡＧ,ＰｏｗｅｒｔｒａｎｓｍｉｓｓｉｏｎａｎｄＤｉｓｔｒｉｂｕｔｉｏｎＧｅｒｍａｎｙ,Ｄ９１０５０．Ｐ．Ｏ...     

R＆D of Complete Equipment for 750-kV Transmission System

The rapid growth of power demand driven by national economic booming has placed challenges before power grids to build transmission lines on higher voltage level over current 500 kV. The construction of 750-kV demonstrative transmission project and promotion of present transmission capability are imperative necessities to lay foundations for research and development of 750-kV or even 1000-kV complete equipment.     

Application HELAVA Digital Photogrammetry System in Extra High Voltage Transmission Line Path Optimization

1.IntroductionTheadvantageofapplyingaetophotogrammetryinextrahigh-voltagetransmissionroutinglinehasbeenwidelyknown.Nevertheless,OwingtotheinfluenceofsomefactorssuchasbackwardinaerophotogrammetricinstrumentinChina,theadVantageofaerophotogrammetryintransmissionlineroutinghasnotbeenwidelydisplayed.Withthefastdevelopmentofspacetechnology,informationtechnologyandcomputertechnology,commercialdigitalphotogrammetryisavailablenow.HELAVAdigitalphotogrammetrysystemwhichusesMaccuratescannerandcomputer…     

The Integrated System of Aerial Photogrammetry and Tower Locations Optimization for Transmission Lines

This paper describes the functions and the features of the integrated system of aerial survey and tower locations optimization for transmission lines, which includes all stages from data acquisition, data transmission and data processing to automatic optimization of the tower locations and drawing. The paper also briefly describes the economic benefit gained from this system, and finally proposes the directions of the future development for this system.     

The Contract for Entrusting Planning and Design of Jinshajiang First Phase Transmission System Project Signed

The Contract of Entrusting Planning and Design of JinshajiangFirst Phase Transmission System Project was signed in Beijingon 14th December 1999. The representative from ChinaYangtze River Three Gorges Development GeneralCorporation as the project owner and the representative fromthe State Power Corporation of China as the trustee havesigned the Contract.The middle and lower reaches of Jinshajiang is the largesthydropower base with favorable economic and technicalparameters in China. …     

UHV Power Transmission in China

1:1 Scale Testing Tower for "Study of External Insulation Characteristics Test of 1:1 Scale Testing Tower for 1000 kV Double Circuit with Same Tower" Has Been Successfully Erected 1:1 scale testing tower for "study of external insulation characteristics test of 1:1 scale testing tower for 1000 kV double circuit with same tower"     

Do We Need More Transmission Capacity?

Given the enormous difficulties associated with siting transmission lines and utility uncertainty over regulatory treatment of new investments, the nation should err on the side of overbuilding.     

The Zouxian-Mengyin Transmission and Substation Project Commissioned

The 500 kV Zouxian-Mengyin transmission and substationproject, the first project independently registered and by theway of nationwide competitive bidding in China was formallycompleted and commissioned on 23rd September 1999.This project has a total investment of 493 million yuan. In thisphase, a 500 kV transmission line with a length of 138.5 kinand a 500 kV substation with transformer capacity of 750 MVAwere built.This transmission and substation project was started toconstruct on 28th S…     

Study on Key 750-kV Transmission Technologies

Introduction The 750-kV transmission demonstrative project of the State Grid Corporation (SG) is a transmission and substation project currently with the highest voltage level in China and on the highest altitude among the same voltage level in the world.…     

Modeling heating effects in nanoscale devices: the present and the future

In this review paper we give an overview on the present state of the art in modeling heat transport in nanoscale devices and what issues we need to address for better and more successful modeling of future devices. We begin with a brief overview of the heat transport in materials and explain why the simple Fourier law fails in nanoscale devices. Then we elaborate on attempts to model heat transport in nanostructures from both perspectives: nanomaterials (the work of Narumanchi and co-workers) and nanodevices (the work of Majumdar, Pop, Goodson and recently Vasileska, Raleva and Goodnick). We use our own simulation results which we have used to examine heat transport in nanoscaling devices to point out some important issues such as the fact that thermal degradation does not increase as we decrease feature size due to the more pronounced non-stationary transport and ballistic transport effects in nanoscale devices. We also point out that instead of using SOI, if one uses Silicon on Diamond technology there is much less heat degradation and better spread of the heat in the Diamond material. We also point out that tools for thermal modeling of nanoscale devices need to be improved from the present state of the art as 3D tools are needed, for example, to simulate heat transport and electrical transport in a FinFET device. Better models than the energy balance equations for the acoustic and optical phonons what we presently use in our simulators are also welcomed. The ultimate goal is to design the tool that can be efficient enough but at the same time can simulate most accurately both electrons and phonons within the particle pictures by solving their corresponding Boltzmann transport equations self-consistently. Investigations in integration of Peltier coolers with CMOS technology are also welcomed and much needed to reduce the problem of heat dissipation in nanoscale devices and interconnects.     

Power Transmission and Distribution Equipment in Steady Progress

SEC is not only one of the largest enterprise groups in China that engaged in designing and manufacturing of power generating equipment, but also is noted for designing and manufacturing power transmission and distribution equipment. Shanghai Power Transmission and Distribution Equipment Corporation is a subsidiary of SEC. It consists of key enterprises, including Shanghai Hua Tong Switchgear Works, Shanghai Relay Plant,Shanghai Instrument Transformer Works, Shang-     

The Engineering Design ofErtan 500 kV Transmission Lines

1.GeneralErtanHydropowerStationwillbethelargestoneofitskindinAsiabytheendofthescentury.Thetotalinstalledcapacityofthesirgeneratingunitswillbe3300W,firmoutputwillbe1000MWandwillgenerate17TWheachyeal.TheWholestationwillbebuiltupin1999.ErtanHydropowerStationwbtransmitelectricitythroughthreecircuitsof500kVtransmissionlinetoZiggongthecenterofSichuanNetworkandwbfurthertransmittoothermainloadcenterssuchasChengdU.Chongqingetc.'I'hetotalIealwbbe2016tri.SinceErtanStationislocatedatthewestborde…     

A Batch of Transmission and Substation Projects Approved

A batch of transmission and substation projects were approvedby the State Power Corporation of China in March 2000, theyare:1. The 220 kV transmission line project from Ji'an of jiangxiProvince is to be constructed with 690 km in length and 540MW in transmission capacity. The total static investmentamounts to 535.54 million yuan provided in loan by the StateDevelopment Bank of China in hard currency.2. The 220 kV transmission and substation project of Tengxianof Guangxi Autonomous Regi…     

Transmission Planning and Investment in the Competitive Environment

Ani mportant conclusion of the mega-blackout of August 14,2003 is the fact that the transmission networkis theweakest link of the restructured electricity business in the United States.The widespread outage pinpointed thecritical needfor investment inthei…     

Research on Electro-Magnetic Environment of UHV Transmission Lines

Employing even higher voltage level to promote power transmission economy is an important subject in the program of power transmission from west to east. The influence of electro-magnetic environment of transmission project being closely related with human health and construction cost has to be seriously considered before advancing transmission voltage. This paper analyzes and discusses overseas and domestic research achievements on radio interference, audible noise, power frequency electric field, power frequency magnetic fields, DC resultant field intensity and ion stream involved in power transmission at ultra-high-voltage (UHV) AC and±800 kV DC or even higher voltage levels. Suggestions on limiting electro-magnetic effects and their ceiling value as well as measures to improve electro-magnetic environment are put forward.     

Transmission capacity of trans-regional power grids is raised

The State Electricity Regulatory Commission (SERC) issued the Regulatory Report on 500-kV National Power Grid Operation and Trans-Regional Trade on November 22. It showed that the 500-kV/330-kV national power grids have covered the vast part of the country except Xinjiang, Tibet and Hainan (Taiwan is not included). At the same time, the trans-regional electricity trade has been expanded.     

Fundamental Options for Designing Transmission Systems Supplying Metropolitan Centers

1. IntroductionBecause of their importance, as well as their high density, loadsin metropolitan centers are very important and require higherstandard of reliability. Many utilities worldwide recognize thisand pays particular attention to such metropolitan centers whenconducting system planning studies. As both utilities servetheir respective national capitals, the North China PowerGroup (NCPG) and Tokyo Electric Power Company(TEPCO) have jointly conducted a research into fundamentalopti…     

Prospect of Future Transmission and Distribution Development in China

ＰｒｏｓｐｅｃｔｏｆＦｕｔｕｒｅＴｒａｎｓｍｉｓｓｉｏｎａｎｄＤｉｓｔｒｉｂｕｔｉｏｎＤｅｖｅｌｏｐｍｅｎｔｉｎＣｈｉｎａＳｈｅｎＧｅｎｃａｉＭｉｎｉｓｔｒｙｏｆＥｌｅｃｔｒｉｃＰｏｗｅｒ１．ＰｒｅｓｅｎｔＳｌａｔｅＤｕｒｉｎｇｔｈｅｒｅｃｅｎｔ１８...     

500 kV Electric Power Transmission Projectof Yangcheng Power Plant

1.lntroductionToconstructpackageddealpr0jectsfortransmittingpowerfr0mYangchengPowerPlantinShanxiProvincetoJiangsuProvince,willnot0n1ymakeupfortheelectricpowershortage0fJiangsuProvincebutalsowillacceleratethedevelopmentofthecoalres0urceinShanxiProvinceandrelaxthedeficienttransportcapacity,furtherprom0tetheeconomydevelopment0fthetwoprovinces.YangchengPowerPlantislocatedatBeiliutowninYangchengcounty,ShanxiProvince.Itis25kmawayfromJinchengcityintheeastandonlyl0kmawayfromYangchengcountyinthe…     

Confined phonon scattering in multivalley Monte Carlo simulation of quantum cascade lasers

We present a detailed investigation of the effects that optical phonon confinement has on the electronic transport properties of GaAs-based multiple-quantum-well (MQW) quantum cascade laser (QCL) structures. Both confined and interface phonon modes are included based on the macroscopic dielectric continuum model. Interface phonon dispersions are obtained using the transfer matrix method with periodic boundary conditions. Scattering rates of both Γ- and X-valley electrons by all the interface and confined phonon modes are calculated and fully incorporated in the multivalley Monte Carlo simulation of a deep-active-well 6.7 μm GaAs-based MQW QCL. We find that the inclusion of phonon confinement enhances the electron-phonon scattering rates and output current to a relatively small extent with respect to the bulk phonon approximation.