一种新型单芯移相变压器的差动保护方法研究  

Research on Differential Protection Method of A New Single Core Phase Shifting Transformer

作　　者：薛玉石 武剑 眭程曦 陈磊 于佳旭 郑涛 XUE Yushi;WU Jian;SUI Chengxi;CHEN Lei;YU Jiaxu;ZHENG Tao(State Grid Shijiazhuang Electric Power Supply Company,Shijiazhuang 050031,Hebei Province,China;State Key Laboratory of New Energy Power System(North China Electric Power University),Changping District,Beijing 102206,China)

机构地区：[1]国网石家庄供电公司,河北省石家庄市050031 [2]新能源电力系统国家重点实验室(华北电力大学),北京市昌平区102206

出　　处：《电网技术》2025年第2期815-823,I0111,共10页Power System Technology

基　　金：国家自然科学基金联合基金(U2166205);国网河北省电力有限公司科技项目(基于柔性互联装备接入的配电网保护策略研究及装置研制,kj2022-074)。

摘　　要：移相变压器作为潮流调控设备,能够动态调节输电线路的传输功率,从而大大提高潮流输送的灵活性。然而,由于其特殊的接线形式和内部结构,新型非对称六角接线形式的单芯移相变压器相较于普通电力变压器而言,故障特征更为复杂,给其本体保护配置带来了困难。为了解决这个问题,首先明确了新型单芯移相变压器的拓扑结构和工作原理。在对其磁路结构进行进一步分析的基础上,利用基尔霍夫电流定律、电磁感应定律等基本电路原理,针对这种特殊结构的移相变压器建立了一套完整的差动保护方案。该方案通过两套电平衡和一套磁平衡差动来反映调压绕组和励磁绕组之间的匝间故障、匝地故障以及引线的短路故障,实现了对移相变压器内部故障的全面覆盖,同时能够快速判断故障位置和故障类型。最后,在MATLAB/Simulink仿真平台上构建了新型单芯移相变压器的仿真模型,通过大量仿真验证了该文提出方案的可行性和有效性。As a flow control device,a phase shifting transformer can dynamically adjust the transmission power of power lines,greatly improving the flexibility of power flow transmission.However,due to its special wiring form and internal structure,a single-core phase shifting transformer with an asymmetric hexagonal connection form has more complex fault characteristics than a conventional power transformer,which poses difficulties to the configuration of its intrinsic protection.To solve this problem,this paper first clarifies the topological structure and working principle of the single-core phase shifting transformer with an asymmetric hexagonal connection.Based on further analysis of its magnetic circuit structure,a complete differential protection scheme is established for this special structure of the phase-shifting transformer,using basic circuit principles such as Kirchhoff's current law and electromagnetic induction law.This scheme reflects inter-turn faults,turn-to-ground faults,and short-circuit faults of the lead wires between the regulating and excitation winding through two sets of level balance and one set of magnetic balance differential protection.It achieves comprehensive coverage of internal faults in the phase-shifting transformer and enables fast determination of fault location and fault type.Finally,a simulation model of the new single-core phase-shifting transformer is built on the MATLAB/Simulink simulation platform,and extensive simulations have verified the feasibility and effectiveness of the proposed scheme.

关 键 词：移相变压器 单芯式 差动保护 电平衡差动 故障定位 

分 类 号：TM721[电气工程—电力系统及自动化]