Coordinating fuel inventory and electric power generation underuncertainty

We discuss the problem of hedging between the natural gas and electric power markets. Based on multiple forecasts for natural gas prices, natural gas demand, and electricity prices, a stochastic optimization model advises a decision maker on when to buy or sell natural gas and when to transform gas into electricity. For relatively small models, branch-and-bound solves the problem to optimality. Larger models are solved using Benders decomposition and Lagrangian relaxation. We apply our approach to the system of an electric utility and succeed in solving problems with 50000 binary variables in less than 4 minutes to within 1.16% of the optimal value     

风力发电场对电网的影响

介绍了风力发电在中国和世界上的发展和现状、并网风力发电机的原理及运行特点,并就宁夏贺兰山风力发电场对宁夏电网的影响进行了分析。     

电动自行车用小型氢燃料电池系统

介绍了电动自行车用氢燃料电池驱动系统设计的基本方法和小型燃料电池系统的主要零部件,并介绍了目前主要的自行车用小型氢燃料电池系统.     

金融危机背景下电力市场发电侧挑战与机遇

从中国电力市场的发展现状入手,深入分析了当前电力体制和经济环境下发电侧所面临的电力需求下降和产能过剩的问题,最后提出了解决方法和建议.     

下一代网络及其在电力系统的应用

以软交换为核心技术的下一代网络(NGN)是业务、控制、接入和承载彼此分离的网络,是一个开放、可扩展的网络。文章介绍了下一代网络的功能层次及其特点,并针对电力系统通信中存在的一些弱点和需求,提出了将NGN应用到电力系统中的设想,认为电力骨干传输网、IP骨干网的逐步建设和优化,已为NGN的应用提供了良好的分组承载平台,而NGN能够提供多业务解决方案,可以消除电力系统必须依赖分离网络而使业务难于融合的弊端。对NGN在电力通信网中的各种应用和NGN建设中需关注的问题进行了探讨。     

燃料电池发电系统中功率变换器的研究

针对燃料电池输出电压等级较低变化范围较宽的输出特性,研究了一种新型变换器,该变换器由前级高增益直流变换器与后级交流变换器组成级联结构。高增益直流变换器采用平均电流控制策略,实现了较高增益的升压及稳压功能,且具有较低开关管电压/电流应力;后级交流变换器采用改进型虚拟同步发电机算法,能够快速准确的跟踪负荷变化、实时无误差的调节频率并具有良好的无功电压下垂特性。通过分析可知:仿真时前级直流输出电压一直稳定在700 V,当无功功率增加200 Var时,电压幅值的波动约为0.5 V,逆变器输出频率不随负荷的波动而发生变化,稳定在50.012 Hz;实验时该直流变换器具有较高的电压增益,可达20倍的增益,并能够稳定在期望值50 V附近稳定工作。仿真及实验分析都验证了采用的拓扑电路结构和控制方法的可行性。     

分散发电电力质量的国际标准

有人建议分散发电应用一组参数来表示其特征 ,该项参数表示最大连续功率 ,无功功率 ,闪变及谐波等 ,并应用它们来预计对电压质量的影响。本文的根据是说明风力发电机组电力质量要求的 IEC6 1 4 0 0 -2 1 ,作者建议相似的内容可以用于其他分散发电技术     

电力信息网中的新一代MSTP

简述了SDH到MSTP的发展必然和演进历程，并突出了基于SDH内嵌RPR中间智能层的新型高效的MSTP解决方案；阐明了RPR这一融合了SDH和IP特点的新技术及其在MSTP中的应用。通过将RPR与IP和SDH分别比较的方法探讨了在MSTP中融入RPR的技术优势，并介绍了采用这一技术的系统在江苏电力信息网中的应用实例。     

浅议发电企业安全教育

安全教育的效果与受教育者自身思想、意识、接受程度等不同有关,不同个体所适应的安全教育方式亦不同.提出了改进安全教育的方式和要点.     

A vehicle electric power generation system with improved outputpower and efficiency

This paper presents a vehicle electric power generation system with improved output and efficiency. At low speed, the output power of the system is maximized by using a controllable rectifier to optimize the operating conditions of the alternator. The controllable rectifier is synchronized with the alternator based on the zero-crossing information of the third harmonic voltage. The output power is controlled by shifting the phase voltage with respect to the third harmonic voltage. At high speed, the system output power and efficiency are increased by changing the number of turns of the alternator stator windings. Winding reconfiguration is realized by winding taps and use of two rectifiers and two switches. A proof-of-concept system has been built and tested in the laboratory. The test data show that the new system can increase the output power significantly at both low and high speed. In the present range in which the alternator is operated most of the time, the winding reconfiguration increases both the output power and efficiency. For the same output power as a production alternator, the winding reconfiguration unit improves the efficiency by 21% (from 47% up to 57%)     

生物质能发电燃料输送系统研究

针对目前我国生物质能发电工程燃料输送系统大多工艺布置不合理、设备功能不完备等向题,介绍了2种生物质能燃料输送系统的工艺流程.生物质能燃料可分为灰色硬质秸秆和黄色纤维秸秆.介绍典型的灰色秸秆工艺流程和典型的黄色秸秆工艺流程.实践证明.这种工艺流程和设备结构能够实现系统连续、稳定、可靠运行,已被推广应用.     

半导体异质结燃料电池发电性能研究

低温固体氧化物燃料电池(LT-SOFC)极具商业化应用前景,而低温工作状态下高性能电解质材料仍是巨大的挑战.基于n型氧化锌和p型氧化镍构建PN半导体异质结材料体系,并将其作为固态电解质应用于LT-SOFC,通过X射线衍射(XRD)、扫描电子显微镜(SEM)等方法对材料进行了实验表征.实验研究了不同质量比例ZnO-NiO...     

Energy delivery capacity and generation scheduling in thederegulated electric power market

The generation schedules obtained in traditional hydrothermal scheduling or unit commitment programs are in hourly generation levels. In the new deregulated power market, the power transactions are processed in terms of hourly energy delivery. Failing to fulfil scheduled energy delivery may result in a penalty to the power producers. This paper shows that although ramp-rate constraints are satisfied in hydrothermal scheduling, taking a generation level schedule as an energy delivery schedule may not be realizable. Based on the maximum principle in optimal control theory, the energy delivery capacity across the scheduling horizon is established as a set of recursive equations with given ramp-rate constraints. A sufficient and necessary condition is obtained to check if an energy delivery schedule is realizable. Based on this condition, two cases, where ramp-rate constraints are both satisfied, are analyzed and an unrealizable energy delivery schedule is observed     

煤气化燃料电池发电技术研究进展

煤气化燃料电池发电（IGFC）技术是一种清洁高效的绿色煤电技术,可以与CO2捕集技 术相结合实现高效率的CO2捕集,并为后续的碳利用与封存提供基础。本文介绍了IGFC技术的研究进展:首先对IGFC系统的整体流程进行说明,其中包括煤气化、粗煤气净化、燃料电池发电、尾气燃烧与余热回收发电等单元的具体流程及主要技术;然后综述了煤气化与煤气净化单元、燃料电池发电单元及IGFC整体流程的模拟研究进展;并对日本、美国和我国的IGFC技术研发与示范情况与目标进行了说明;最后总结了IGFC技术研发亟需解决的关键问题,其中主要包括大功率燃料电池的长周期运行、粗煤气中温干法净化和尾气纯氧催化燃烧技术开发等技术存在问题,可为后续兆瓦级IGFC系统的开发与示范提供指导。     

Perspectives of the electric power industry amid the transforming global power generation markets

A scenario-based prognosis of the evolution of global power generation markets until 2040, which was developed using the Scaner model-and-information complex, was given. The perspective development of fuel markets, vital for the power generation industry, was considered, and an attempt to predict the demand, production, and prices of oil, gas, coal, and noncarbon resources across various regions of the world was made. The anticipated decline in the growth of the global demand for fossil fuels and their sufficiency with relatively low extraction expenses will maintain the fuel prices (the data hereinafter are given as per 2014 prices) lower than their peak values in 2012. The outrunning growth of demand for electric power is shown in comparison with other power resources by regions and large countries in the world. The conditions of interfuel competition in the electric power industry considering the changes in anticipated fuel prices and cost indicators for various power generation technologies were studied. For this purpose, the ratios of discounted costs of electric power production by new gas and coal TPPs and wind and solar power plants were estimated. It was proven that accounting the system effects (operation modes, necessary duplicating and reserving the power of electric power plants using renewable energy sources) notably reduces the competitiveness of the renewable power industry and is not always compensated by the expected lowering of its capital intensity and growth of fuel for TPPs. However, even with a moderate (in relation to other prognoses) growth of the role of power plants using renewable energy sources, they will triple electric power production. In this context, thermal power plants will preserve their leadership covering up to 60% of the global electric power production, approximately half using gas.     

Forecasting electric power generation in a photovoltaic power system for an energy network

Recently, there has been an increase in concern about the global environment. Interest is growing in developing an energy network by which new energy systems such as photovoltaic and fuel cells generate power locally and electrical power and heat are controlled with a communication network. We developed the power generation forecast method for photovoltaic power systems in an energy network. The method makes use of weather information and regression analysis. We carried out forecasting power output of the photovoltaic power system installed in Expo 2005, Aichi Japan. As a result of comparing measurements with prediction values, the average prediction error per day was about 26% of the measured power. © 2009 Wiley Periodicals, Inc. Electr Eng Jpn, 167(4): 16–23, 2009; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20755     

单电源燃料电池电动车的设计与控制研究

采用质子交换膜燃料电池(PEM FC)与人力相结合的动力系统,设计出一种仅由PEM FC供电的电动车。该系统针对PEM FC在电动车启动、爬坡时输出功率不能很好满足车辆要求的特性,采用人力补偿及合理的控制策略使PEM FC在高效率下运行,克服PEM FC作为独立电源供电的不足。理论分析和实物运行结果表明,该系统具有较高的能量效率和良好的运行稳定性。     

电力呼叫中心业务生成系统技术概论

概述电力系统呼叫中心利用先进的计算机技术——可扩展标记语言XML(eXtensible Markup Lan-guage)与通信技术——智能网IN(Intelligent Network)设计实现具有普遍性的电力系统呼叫中心业务生成系统，该方法已成功地在电力呼叫中心系统中推广应用。