SMPS Design Toolkit 1.6设计软件及其应用

美国飞兆半导体公司（Fairchild Semiconduetor Inc.）最近推出新的开关电源设计软件SMPS Design Toolkit 1.6,该软件具有制作精良、功能强大、设计灵活、使用简便等显著优点。用户利用交互式设计助手,根据程序提供的步骤,很容易完成反激式开关电源或准谐振式变换器的全部设计工作。     

Can FERC’s Standard Market Design Work in Large RTOs?

The two major FERC initiatives right now are Standard Market Design—which includes locational marginal pricing—and consolidation of regional transmission organizations. But SMD in combination with large RTOs can cause serious new inefficiencies unless corrective actions are taken.     

What’s next for Cuba’s electricity sector?

Cuba’s electric sector is approaching an inflection point. Although the country has historically relied upon non-commercial barter agreements for imported oil to meet its electric demand, a combination of factors including reducing imports, increasing demand, and ambitious climate change goals suggest new pathways forward may be warranted. The way Cuba responds to near- and long-term challenges will help set the stage for its energy future. This article describes Cuba's electric sector and provides a set of key recommendations to consider going forward.     

Realization of UPQC H∞ coordinated control in Microgrid

Aiming at the complicated power quality problems with the coexistence of voltage quality and current quality in Microgrid, a comprehensive regulation technology of power quality is urgently needed, which makes unified power quality conditioner (UPQC) have widespread application fields. As a multiple power quality conditioner, UPQC gathers the functions of voltage quality compensator, current quality compensator and energy storage device in the integrated manner, meeting the needs of comprehensive power quality control for the Microgrid. In this paper, the advanced H_∞ control theory is adopted for further development on the UPQC generalized controlled system, and the Riccati solution method of the H_∞ controller is presented. Through analyzing the coupling effect between UPQC series unit and shunt unit, a design method of UPQC coordinated controller based on H_∞ control theory is proposed. The simulation and experimental results show that the proposed method can realize UPQC series unit voltage tracking compensation and shunt unit current tracking compensation simultaneously without steady-state phase shift and amplitude degradation. Moreover, the proposed method radically eliminates the coupling effect between UPQC series unit and shunt unit, and realizes the multiple power quality coordinated control functions of UPQC.     

新型电网-微电网(Microgrid)研究综述

首先介绍了微电网的产生背景,并对微电网进行定义.其次,在对比了各国微电网的研究进展现状后,针对一个典型的微电网阐述了基本运行方式.接着介绍了微电网的电源和储能形式,并对微源的控制器特性即频率下垂曲线进行了简单的描述.微电网输配电系统也与传统电网有着明显的不同,由于低压线路参数的特殊性,需要对功率调节公式进行修正.微电网系统优化与稳定也是微电网的关键研究内容之一,初步给出了系统优化和稳定运行目标.最后,在依托电工所在新能源方面的既有成果上,提出了微电网的将来研究的重点和难点.     

Electricity in the 1970’s,Water in the 2020’s

This articles discusses the parallels between the past trends in the US electricity sector with forthcoming trends in the water sector.     

Can Yesterday’s Demand-Side Management Lessons Become Tomorrow’s Market Solutions?

The value of DSM solutions has not diminished since the 1980s. But program providers need to package such programs to be more attractive to customers and beneficial to energy providers if they are finally to find a meaningful role.     

新型电网-微电网（Microgrid）研究综述

首先介绍了微电网的产生背景,并对微电网进行定义。其次,在对比了各国微电网的研究进展现状后,针对一个典型的微电网阐述了基本运行方式。接着介绍了微电网的电源和储能形式,并对微源的控制器特性即频率下垂曲线进行了简单的描述。微电网输配电系统也与传统电网有着明显的不同,由于低压线路参数的特殊性,需要对功率调节公式进行修正。微电网系统优化与稳定也是微电网的关键研究内容之一,初步给出了系统优化和稳定运行目标。最后,在依托电工所在新能源方面的既有成果上,提出了微电网的将来研究的重点和难点。     

Sandia频移法在电子负载孤岛检测中的

以单相馈能型电子负载为研究对象,详细分析了Sandia频移式孤岛检测法(SFS)原理,描述其检测盲区,并对SFS算法中的参数进行优化.与此同时,将SFS与Sandia电压偏移法(SVS)结合,并辅助过/欠频率、过/欠电压保护,形成一种复合型的孤岛检测法.最后在MATLAB/Simulink环境下,搭建了仿真模型,仿真结果表明,参数优化后,系统可实现特定负载下的无盲区检测,将SFS和SVS结合使用明显提高检测效率,能够快速有效地进行孤岛保护,输出电能质量较高,验证了设计方案的可行性和优越性.     

无盲区Sandia频移式孤岛检测参数设计

建立了Sandia频移式(SFS)孤岛检测的数学分析模型,并给出频移系数的优化过程及优化孤岛检测算法中的解析依据,得出特定负载下孤岛无检测盲区(NDZ)频移系数的取值范围。提出了一种实用的孤岛NDZ描述方法,可反映各个电气参量对NDZ的影响。最后根据IEEE Std,929-2000的规定,建立了仿真模型和实验平台,仿真和实验结果均表明所提SFS孤岛检测的参数设计能快速有效地进行孤岛保护,且对电网无污染。     

China’s power consumption to rebound

China’s power consumption is expected to rise 4 percent to 6 percent year-on-year in the fourth quarter as the country’s economy is stabilizing. That will bring electricity consumption in the entire year to 4.94 TWh, up 5 percent from a year earlier, the China Electricity Council said on October 30. According to CEC, the country’s total installed power generation capacity will hit 1.14 TWh at the end of this year. Power demand and supply will be balanced because there are     

Trend in China’s Wind Power

Attractive prospects for wind power development Sha Yiqiang: In recent years, the development andutilization of wind energy has achieved remarkable     

Bushings Design of Converter Transformer＇s Valve Side of UHVDC Transmission Project

换流变压器阀侧套管作为换流变压器的关键组成部分,长期以来依靠进口,对其进行设计具有重要意义。为此,基于GB/T 22674—2008《直流系统用套管》及国家电网公司2011年5月份颁布的《±1 100千伏特高压直流输电工程设备研制技术规范-换流变压器册》技术规范,对准东-重庆±1 100kV特高压直流输电工程换流变压器阀侧套管结构型式、外绝缘、性能及关键技术进行了研究。结果表明：换流变压器阀侧套管结构比较复杂,采用充SF6式型式比较好;绝缘水平比换流变压器绕组绝缘水平要提高不等系数,其中雷电冲击耐受和操作冲击耐受提高1.05倍,直流耐受、极性反转和工频耐受试验水平提高1.15倍。根据研究结果给出了准东换流站换流变压器阀侧套管的技术参数,对±1 100kV特高压直流输电工程换流变压器阀侧套管的研制具有重要指导作用。     

The world’s highest transmission tower erected

In April the long span towers crossing the Yangtze River, seated in Ligang Township of Jiangyin City, was successfully hoisted and erected. The world's highest river-crossing type is in the double-circuit transmission line structure. Its     

Precise control of single-phenanthrene junction’s conductance

Journal of Computational Electronics - The electronic transmission of fifteen potential configurations of the single-phenanthrene junction has been theoretically investigated. The structures...     

Future Expectation for China’s Nuclear Power

China: the future of nuclear powerWang Yonggan: In terms of the highlighted issue ofenergy security, oil is of paramount importance, coal isthe foundation and electricity is the pivot according to     

World’s new highest arch dam emerged

<正>On March 8, 2010, the concrete pouring was completed on the dam crest in the state’s key project, Yunnan Xiaowan Hydropower Station. Consequently,