摘要
现有融冰技术研究主要针对融冰稳态过程中的热效应,缺乏对融冰装置接入电网的暂态过程研究。为此,以适用于配电网的零序电流在线融冰技术为研究对象,从其融冰工作原理出发分析融冰暂态性能,建立接地变压器的励磁涌流暂态数学模型,提出适用于接地变压器的基于改进选相合闸技术的励磁涌流抑制策略。以粤北山区某支线作为试点线路,根据覆冰线路参数仿真验证暂态特性及励磁涌流策略的可行性。结果表明在融冰装置投切期间,配电网系统会出现过电流暂态,对系统的安全稳定运行产生威胁,采用基于改进选相合闸技术的励磁涌流抑制策略能较好抑制暂态过电流,保障在线融冰安全进行。
Current research on ice melting technology mainly focuses on the thermal effect in the steady-state process of ice melting,and there is a lack of research on the transient process of ice melting devices connected to the power grid.In view of this,this paper takes zero-sequence current online ice melting technology suitable for the distribution network as the research object,analyzes the transient performance of ice melting from its ice melting working principle.It establishes a mathematical model of the excitation inrush current transient of the grounding transformer and proposes the excitation inrush current suppression strategy based on the improved phase selection and closing technology for the grounding transformer.Taking a branch line in the mountainous area of northern Guangdong as a pilot line,the transient characteristics and the feasibility of the excitation inrush current strategy are verified according to the parameters of the icing line.The results show that during the switching period of the ice melting device,the overcurrent transient state occurs in the distribution network system,which poses a threat to the safe and stable operation of the system,and the excitation inrush current suppression strategy based on the improved phase selection and closing technology can better suppress the transient overcurrent and ensure the safety of online ice melting.
作者
杨芳
徐嘉欣
唐小亮
周亚兵
李达义
YANG Fang;XU Jiaxin;TANG Xiaoliang;ZHOU Yabing;LI Dayi(CSG Guangdong Qingyuan Power Supply Bureau,Qingyuan,Guangdong 511518,China;State Key Laboratory of Advanced Electromagnetic Engineering and Technology,Huazhong University of Science and Technology,Wuhan,Hubei 430074,China)
出处
《广东电力》
北大核心
2024年第10期112-120,共9页
Guangdong Electric Power
基金
中国南方电网有限责任公司科技项目(031800KC23060002)。
关键词
不停电融冰
接地变压器
励磁涌流
暂态过电流
选相合闸
uninterrupted power melting
grounding transformer
inrush current
transient overcurrent
selecting phase
作者简介
杨芳(1986),男,湖南益阳人,高级工程师,硕士,主要从事输智能技术及线路运行管理、线路融冰方面的研究工作,E-mail:317872818@qq.com;徐嘉欣(1999),女,湖北武汉人,在读硕士研究生,主要从事线路融冰方面的研究工作,E-mail:734508134@qq.com;唐小亮(1984),男,湖北咸宁人,高级工程师,硕士,主要从事输配电专业、架空配电线路防雷策略、线路融冰方面的研究工作,E-mail:249764074@qq.com;周亚兵(1982),男,湖北黄冈人,高级工程师,硕士,主要从事线路融冰方面的研究工作,E-mail:767746949@qq.com;李达义(1970),男,天津人,教授,博士,从事电力电子与电力传动、有源滤波器和FACTS技术、电力系统电能质量、电机及其控制、电力系统建模与仿真的研究,E-mail:ldy@mail.hust.edu.cn。
