摘要
提出了一种基于模型识别的并联电容器保护方法.该方法通过电容器模型方程对区内外故障时电容器参数进行求解,根据其主要特征离散度的不同来判断故障在区内或区外.使用微分方程求解网络参数,因而该方法不受非周期分量和高次谐波的影响.这种故障判断方法可以作为电容器组的保护.当区外相间故障时,可靠闭锁;当电容器连接线相间短路、内部元件击穿或电抗器匝间短路时,可靠动作.数值仿真结果表明,该方法能够在5 ms的时间内判断出故障,使保护的速动性和可靠性得到很大提高.
A new shunt capacitor protection principle based on model identification is proposed compared the capacitance deviation of in-zone and out-zone faults calculated with the capacitor modal equation, the fault type can be determined. The method is immune from non-periodic component and high-frequency component due to the essential dependence on the differential algorithm on network parameter distingui＇shing. This judgement scheme can also be used as capacitors protection. When in-zone inter-phase faults or longitudinal faults occur, the protection works. Otherwise, it gets locked. ATP simulations show the scheme enables to determine fault direction within 5ms and enhance the rate and reliability greatly.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2008年第12期1506-1509,共4页
Journal of Xi'an Jiaotong University
基金
教育部高等学校博士学科点专项基金资助项目(20070698057)
国家科技攻关"十五"计划专项经费资助项目(2005BA208C)
国家自然科学基金资助项目(50677051
50877061)
关键词
故障分量
模型识别
离散度
fault-superimposed components
model identification
deviation
