Fuzzy理论在电力系统铁磁谐振研究中的应用

根据电力系统铁磁谐振的模糊性 ,应用Fuzzy理论对电力系统发生铁磁谐振的可能性、影响因素及防止措施进行了研究。这种新方法对补充和完善铁磁谐振问题的研究具有重要的意义     

Method for dynamic behaviour control of electric power systems

A statistical method that determines quality indices is presented. These indices give the regression relations for the dynamic behaviour of an electric power system as a function of some EPS scheme and regime parameters. The regression relations obtained are simple and allow a rapid and precise analysis and synthesis. The method is applied to solve an example of a real problem system.     

Application of distributed and dependable computer systems in power systems

Recent developments in computer science in both distributed and dependable computing, together with the increasing diversity and flexibility in the type of hardware, has introduced new design possibilities for power system engineers. The advantages of using computer systems within power systems and the possible development of such systems are reviewed. The increased use of computers, however, also results in an increased number of new problems and these and their possible solution are reviewed.     

基于SVG的电力系统图形互操作研究

可缩放矢量图形(SVG)作为IEC61970标准推荐采用的公共图形交换的文件格式.提出要实现不同开发商开发的图形文件信息的相互识别和交换,以及实现电力系统图形的互操作的关键是要建立基于SVG格式所组成的电力系统图形文件各元素的语义表达格式标准和电力系统图形文件的组成结构标准,并按照IEC61970描述电力系统资源的标准...     

Recent advances in digital protection

The development of digital protection in Japan is determined by an industry policy which gives priority to the commercial development of products aimed at replacing conventional protective relay equipment. As a result of this policy, the use of digital relays has spread through Japan faster than in other countries. Major efforts have been made to establish the reliability of the dedicated digital hardware and improve the economics of digital protection. Progress in the use of digital protection will lead, in the near future, to the totally computerized substation system.     

开关电源在电力系统中的应用

与传统的相控型直流电源相比,开关电源模块各项性能指标优异,维护方便,随着电力系统应用开关电源技术的不断完善,开关电源将全面替代相控电源,成为电力用直流电源的首选.     

Nonlinear oscillations in power systems

The classical swing equation for a power generator is shown to undergo a Hopf bifurcation to periodic solutions if it is augmented to include any of the following effects: variable net damping, frequency dependence of the electrical torque, a lossy transmission line and excitation control. Oscillations are seen to occur for realistic parameter values, and the stability of the oscillations is studied both analytically and numerically.     

电力系统功率连接装置接口稳定性问题及其改进措施

对于功率接口的安全性和可靠性而言,闭环稳定性是首先必须解决的问题。实际应用中,功率接口延时和接口中的直流偏移问题是影响仿真稳定性的2个重要因素。通过采取延时补偿解决延时带来的稳定性问题,针对接口中的直流偏移问题提出了一种直流控制环。现场实验证明,延时补偿方案有效消除了接口误差,直流控制环较好地抑制了功率接口中的直流分量,改进的混合接口方案具有较高的接口稳定性以及良好的动态性能。     

Parallel processing in power systems

A brief status report is presented of the emerging computer architectures and their probable influence on power-system computing. Experiences with three groups of computers are reviewed, namely supercomputers, array processors and multiprocessor networks.     

电力系统振荡对三相故障距离继电器影响的分析及对策

针对发生对称性故障、系统振荡以及振荡中再故障三方面分析了三相故障距离继电器的动作性能;重点分析研究了在系统振荡再故障的情况下该继电器的动作特性,分析发现该继电器在此种情况下可能发生拒动;在此基础上提出了改进措施,引入了振荡再故障判断元件来启动姆欧继电器,有效提高了保护的可靠性。PSCAD仿真验证了理论分析的正确性以及所提方案的有效性。     

继电保护与电力系统灾变防治

分析了继电保护在电力系统灾变事故中所起的作用;从灾变防治的角度对继电保护提出了要求;探讨了围绕灾变防治的继电保护研究目标。     

Modeling and stability analysis of hybrid power systems for the more electric aircraft

This paper presents a detailed modeling and a comprehensive assessment of small-signal stability for a “more-electric” vehicular power system consisting of a synchronous variable-frequency generator which supplies power electronic controlled loads via an 18-pulse autotransformer rectifier unit for AC-DC conversion. Functional models for key power system components and loads are derived. Analytical derivations employed for small signal stability analysis based on linearized equations are described, and the influence of leading design parameters on system stability is evaluated.     

How to compensate for the reactive and distorting powers in ship electric power systems

Procedures used to compensate for reactive and distorting powers that do not create active power, but rather cause additional power losses and failures in consumer equipment are examined. It is shown that promising procedures for compensating for reactive power can be implemented using similar methods that take into consderation the peculiarities each of them. It is suggested that reactive energy be compensated for based on powerful low-frequency keys with current modulation using a traditional procedure with a stable carrier frequency; the implementation of active filtration based on high-frequency keys with hysteresis control of modulation is also recommended.     

GIS在电力系统应用的探讨

介绍了地理信息系统的概念及主要研究内容，阐述了国外电力企业在GIS方面的应用，并对GIS在国内电力企业应用的前景进行了探讨。     

Economic evaluation of independent power producers viewed from total generating costs of electric power systems

In Japan, electric power utilities purchase electricity from independent power producers (IPPs) through competitive bidding; the IPP evaluation is based on the avoided costs of corresponding generators of utilities. In this evaluation, however, nonpricing factors such as power flow constraints in the electric power system cannot be considered. In this paper, we propose a new approach to evaluate economic impacts of IPPs, the IPP electricity being priced on the basis of total generating costs of the electric power utilities. Such a price to purchase the electricity of IPPs is referred to as the “break‐even cost.” The main results are summarized as follows: 1) Break‐even cost depends on not only the power flow constraints in the system, but also various IPP factors such as generating pattern, location, and capacity, 2) Break‐even cost for the base‐type IPP is higher than the avoided cost of corresponding utility generators, because IPPs located on demand sides can reduce the transmission power loss in the electric power system, 3) Break‐even cost is affected by available capacity of utility generators, especially for the peak‐type IPP generating only during peak demand periods. © 2000 Scripta Technica, Electr Eng Jpn, 133(2): 20–30, 2000     

基于可变容差法的电力系统最优潮流计算

介绍了电力系统中以发电费用最小为目标的最优潮流计算的可变容差法。该方法无需求解目标函数的导数，利用数值搜索优化机制，可较好地获得最优解。实例分析表明，与现有的模型求解方法相比，可变容差法具有较好的寻优效果。可以作为电力系统最优潮流计算的一种补充方法。     

电动汽车流动供电站电源管理系统的设计

分析了目前电动汽车充电站发展的现状及存在的问题,提出了电动汽车流动供电站设计方案.该方案中的流动供电站直接从供电电网取电为电动汽车或油电双模汽车的驱动电机供电,并在电动汽车行驶过程中对蓄电池进行补充充电.电源管理系统是流动供电站设计的核心,包括用户识别、计量结算、充电管理、用户报警等信息的管理,是实现流动供电站的无人值守、自动供电的关键.阐述了电动汽车流动供电站的硬件和软件系统的设计.包括基于IC卡和单片机技术设计电源管理系统的数据采集、传输和处理等模块的电路,以及为实现该系统功能而开发的软件系统及主要程序.     

电力系统小扰动稳定的直接法分析

对李亚普诺夫直接法用于分析和评价电力系统小扰动稳定性进行研究.介绍了线性定常系统稳定性的直接法判据,剖析了求解李亚普诺夫方程的算法,引入状态偏差量平方积分指标对系统动态性能进行评价.以4个算例系统的低频振荡为对象,具体研究直接法在电力系统小扰动稳定分析中的应用.研究结果表明:直接法可以正确可靠地判断电力系统的小扰动稳定...     

对GPRS在电力系统应用的分析

论文分析了基于GPRS网络VPN的安全性和可靠性。作为电力通信的补充，对GPRS在电力系统应用的可行性进行了分析。     

分布式供能站热电特征设计

列举了中国分布式供能系统的应用情况,介绍了中国分布式供能站的发展现状。以某分布式供能站为例,介绍建筑原有接线情况和主接线方案以及热负荷状况,阐述热电设计的设想,并对包含机组选型、燃料系统、热力系统热工控制等各方面情况进行了详细介绍。