不停电融冰方法下配电网多馈线架空线路暂态特性仿真研究  

Research on Transient Performance of Uninterrupted Power Ice Melting Method for Long-distance Multi-feeder Overhead Lines in Distribution Network

作　　者：杨芳 徐嘉欣 唐小亮 周亚兵 李达义[2] 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)

机构地区：[1]南方电网广东清远供电局,广东清远511518 [2]华中科技大学强电磁工程与新技术国家重点实验室,湖北武汉430074

出　　处：《广东电力》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)。

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.

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 

分 类 号：TM752.5[电气工程—电力系统及自动化]