共查询到19条相似文献,搜索用时 83 毫秒
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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. 相似文献
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电力系统铁磁谐振研究现状 总被引:3,自引:0,他引:3
铁磁谐振过电压是一种常见的内部过电压,多发生在中性点不直接接地的配电网中,但在中性点直接接地的高压电网中,这种事故也常有发生。分析了电力系统铁磁谐振的产生机理,介绍了一些典型的铁磁谐振过电压,以及几种消除铁磁谐振的措施及原理,最后对铁磁谐振的当前研究现状进行了评价,提出今后进一步的研究方向。 相似文献
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本文介绍一种在线监测电力系统铁磁谐振的软件,能实时的发出不同频率的谐振信号,启动执行装置,迅速消振,并有屏幕显示,音响报警,功能较全,可作为变电站整个微机监控的一个组成部分 相似文献
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中性点接地电力系统三相铁磁谐振的理论分析 总被引:4,自引:0,他引:4
利用线性时变理论对零序电阻在消除中性点接地电力系统中铁磁谐振的作用进行深入分析,得到了利用零序电阻消除这种谐振的理论结果,在很大程度上解决了零序电阻在消除这种谐振上的理论问题. 相似文献
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电力系统中包含有很多电感和电容元件,在系统发生故障时,它会形成不同自振频率的振荡回路,在外加电源的作用下会产生谐振过电压,而电力系统中的电感元件大多因带有铁芯会产生饱和现象,使电感参数不再是常数,而是随着电流或磁通的变化而变化,这样就形成了电力系统铁磁谐振过电压。它会破坏电气设备的绝缘,甚至会烧毁电气设备,严重威胁着电力系统的安全、稳定运行。本文着重分析了电力系统铁磁谐振过电压的产生原理,介绍了电力系统中一些典型的铁磁谐振过电压及其危害,并提出具体的防范措施。 相似文献
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铁磁谐振的发生导致绝缘事故、设备损坏,影响电网安全运行,为此,需要对铁磁谐振和消谐方法研究。常规方法是在PT二次侧开口三角两端接阻尼电阻,这样可能存在电阻容量不满足要求和影响继电保护的缺点。本文改进了该方法,提出瞬时零阻抗消谐法。利用Matlab/Simulink建立铁磁谐振系统模型,对瞬时零阻抗消谐法仿真验证,结果表明:(1)单相接地故障引起的铁磁谐振性质与线路的长度和故障切除时刻有关;(2)仿真结果表明瞬时零阻抗消谐法能够有效消除系统中发生的铁磁谐振。 相似文献
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Y. Sekine Y. Tamura H. Yamaguchi Y. Yamakoshi J. Makino 《International Journal of Electrical Power & Energy Systems》1982,4(1):62-70
The present status of microprocessor applications in various fields of electric power systems is summarized. Special attention is directed towards development trends in the protection field where microprocessor applications are expected to cope with the increasingly stringent requirements for electric power supply reliability. Also discussed are the history, roles, design philosophy and basic schemes of microprocessor-based protective relaying systems. Only recently has their application reached a practical stage after long-term study and repeated field tests. 相似文献
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S. Iliev 《International Journal of Electrical Power & Energy Systems》1984,6(4):212-220
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. 相似文献
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故障树分析在电力系统可靠性研究中的应用 总被引:12,自引:0,他引:12
对于设计人员来说,如何在方案论证阶段就直观、清晰地了解到各种方案中电力系统的可靠性是十分重要的。为解决较复杂的电力系统的安全性和可靠性问题,应把系统的故障与组成系统的部件的故障有机地联系在一起。通过实例分析,介绍了故障树分析的基本概念、建模方式、计算步骤及其在电力系统可靠性研究中的应用。 相似文献
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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. 相似文献