摘要
为提升比率制动差动保护区内故障的灵敏性和区外故障抗TA饱和能力,提出一种基于电流向量l_(2)范数的变压器比率制动差动保护新判据。首先,对变压器区内外故障时电流信号进行范数分析,利用范数边界变化特点,构建一种基于电流相量差的电流向量l_(2)范数的制动电流。其次,利用电流向量l_(1)范数和l_(∞)范数的边界约束关系对l_(2)范数制动电流进行优化。在保证区内故障灵敏度同时,进一步提升l_(2)范数比率制动差动保护的抗饱和能力。最后,经RTDS测试和工程实际案例,证明提出的新判据具有更高的灵敏度、更强的抗TA饱和能力,综合性能显著优于当前工程广泛采用的电流模值和制动及最大值制动方法。
To enhance the sensitivity at the inner fault and the TA anti-saturation capability at the external fault of the transformer ratio restrained differential protection,a new criterion based on l_(2) norm of current vectors was proposed in this paper.Firstly,the norm analysis of the current signal at the inner and external faults of the transformer was performed.A restraint current based on l_(2) norm of current vectors composed of current phasor difference was constructed by using the characteristics of the change of norm boundary.Secondly,the l_(2) norm based restraint current was optimized using the boundary constraint relationship of the l_(1) norm and the l_(∞)norm so that the sensitivity can be kept and its TA anti-saturation capability can be further improved.Finally,the RTDS testing and engineering practical cases prove that the proposed criterion has higher sensitivity and stronger TA anti-saturation capability.The comprehensive performance of new criterion is significantly better than the absolute value sum restrained and the maximum value restrained methods widely used in engineering.
作者
廖小君
李龙源
童晓阳
王晓茹
LIAO Xiaojun;LI Longyuan;TONG Xiaoyang;WANG Xiaoru(School of Electrical Engineering,Southwest Jiaotong University,Chengdu 611756,Sichuan Province,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2022年第18期6693-6703,共11页
Proceedings of the CSEE
关键词
变压器差动保护
比率制动特性
范数理论
电流互感器饱和
transformer differential protection
ratio restrained properties
norm theory
current transformer saturation
作者简介
廖小君(1974),男,博士研究生,副教授,研究方向为电力系统继电保护与控制,liaoxj_px@qq.com;李龙源(1993),男,博士研究生,研究方向为含新能源的电力系统稳定性分析、风电建模,lilongyuan2012@163.com;童晓阳(1970),男,博士,副教授,博士生导师,研究方向为广域后备保护、智能变电站、能源互联网,xytong@swjtu.cn;通信作者:王晓茹(1962),女,博士,教授,博士生导师,研究方向为电力系统稳定性分析与控制,xrwang@home.swjtu.edu.cn。
