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交流励磁发电机(ACEG)能实现有功功率、无功功率和转速的解耦控制,实现变速恒频发电.交流励磁系统具有多变量、非线性、强耦合和参数不确定性的特点.传统的PID控制难以解决系统非线性问题,矢量控制方法能实现控制变量解耦却依赖具体数学模型.提出一种基于模糊神经网络的解耦控制方法.实验证明该方法能够实现交流励磁发电机变速恒频发电,且方法简单、灵活、方便、有效、鲁棒性强. 相似文献
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分析了目前采用的最大功率跟踪的方法及缺陷,提出了一种新的最大功率跟踪方法。推导了此跟踪方法的工作原理,并给出了跟踪方法的实现算法、控制策略、实现的流程图以及实现的具体步骤。介绍了该最大功率跟踪方法在并网光伏逆变中的具体应用。通过新方法仿真结果与牛顿插值法仿真结果的对比,以及光伏并网逆变器的输出波形,证实所采用控制策略和实现方法是完全正确的。 相似文献
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文中就配电管理地理信息系统 (GIS)和配网 DA系统实现一体化的一些基本概念、设计原则和实现方法作了一定的论述,并着重对用连接式实现一体化提出自己的一些解决方法. 相似文献
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阐述了蓄电池远程容量测试系统的设计实现方法、组成结构及功能特点,并对其总体构架、实现原理,以及蓄电池远程容量测试系统在单组电池环境下容量测试时防止负载失电的实现方法进行了描述。 相似文献
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电网建设是县供电企业实现科学化、规范化、精益化管理,实现创一流供电企业的目标必不可少的硬件基础,系统的管理思想、管理制度、管理措施和管理方法就是保证目标实现的软件基础,二者相辅相成、缺一不可。本文着重就运用系统工程方法实施企业目标管理加以探讨。 相似文献
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介绍了基于LabVIEW实现对仪器UPC-32的程序控制方法,通过应用实例详细介绍了仪器的命令格式、软件编程思路及具体实现方法。 相似文献
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Melkus Marvin R. McHugh Frank J. Ho Timothy T. 《Industry Applications, IEEE Transactions on》1972,(6):772-782
This paper introduces a computerized wiring system that is new to the industry. It begins with the reasons for the development of the computer program to process the wiring system data in favor of conventional drafted schedules and diagrams. A brief explanation of the computer program is given, and the common terms associated with wiring methods are redefined for use by the computer. The program operates by itemizing the input data of raceways, circuits, and wire terminations; processing these data to create maintenance files and print various schedules. Sample schedules included in the paper show how some of the schedules are intended for use by the designers, some for contract documentation, and others for construction or maintenance. Methods for updating, revising, and maintaining the computer file are also included, and a general guide for planning and controlling a project via computer wiring system methods is offered. Finally the merits of the computerized system are discussed with possible future improvements projected. 相似文献
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Horton R. Warren T. Fender K. Harry S. Gross C.A. 《Power Delivery, IEEE Transactions on》2002,17(3):698-701
In recent years, a large number of electric utilities have been implementing fuseless split-wye grounded capacitor banks in lieu of the traditional externally fused bank. This change in philosophy has forced many protection engineers to research new methods of calculating the quantities needed to apply unbalance protection. This paper presents a novel method of calculating the unbalance current produced by fuseless capacitor unit failures as well as some general background information regarding fuseless split-wye grounded capacitor bank technology and unbalanced protection. 相似文献
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The measurement of locked-rotor current, torque, and power factor has been a standard test for induction machines for many years. Measurement of torque has evolved from using a brake, a dynamometer, a torque arm, and scale, through strain gauges and load cells to acceleration tests. The test must be of short duration to prevent damage to the machine and large machines present problems because of facility limitations in either kilovoltampere or torque measurement. A single test at reduced voltage when prorated to operating voltage by the square of the ratio of rated voltage to test voltage neglects the impact of saturation and results in significantly lower values of predicted torque and current. This paper discusses several methods for performing the locked-rotor and the speed-torque tests on large machines. It also discusses some of the problems associated with the test methods and shows how the tests can be performed and the results evaluated to account for saturation effects. Finally, the paper shows how to extract some machine circuit parameters from the test data 相似文献
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从分析现状问题出发,从核心层面探讨了人才管理中“选才、用才、育才、留才”四个关键环节的作用,并提出一些工作思路和方法,以保持企业在市场中的竞争优势。 相似文献
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E. A. Grin’ 《Thermal Engineering》2013,60(1):24-31
The fundamentals of fracture mechanics are briefly outlined, and its possibilities as a tool for estimating the longevity and bearing capacity of equipment components the metal of which contains cracklike flaws are pointed out. Experimentally obtained kinetic crack resistance diagrams lying at the heart of methods for determining the survivability of structures are given for some steels. Practical application of the methods of fracture mechanics is demonstrated on a particular example of substantiating temporary operability of a boiler drum having cracklike flaws near the holes for water downtake pipes. 相似文献
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本文讨论了对于新能源供电系统与电能变换装置应用具有重要作用的问题,着重探讨电力电子变换、系统集成和技术融合。论文首先论述了风力发电、太阳能电池和燃料电池等几种新能源的供电方式,并提出电源变换在新能源电力系统中的核心作用是值得注意的共性问题和关键技术。为此,电能变换装置特别是直流变换器和交流逆变器被广泛地用于新能源电力系统,以组成集成供电系统。论文进一步提出了技术融合的思想,将现代电源技术、功率变换技术、控制方法、安全保护及智能管理等结合成一种综合方法来解决目前面临的问题,并展望了新能源电力系统的在混合供电、分布式电力系统和便携式电源等方面的应用前景。 相似文献