电力系统保护与控制2025，Vol.53Issue(4)：27-36,10.DOI:10.19783/j.cnki.pspc.240526
基于模型校核的静止变频器采样值差动保护原理
Principle of sampled value differential protection of static frequency converters based on model verification
摘要
Abstract
Static frequency converter(SFC)is an important piece of equipment for the startup process of large synchronous units in pumped storage power plants.In the process of startup,the different current frequencies on both sides of the SFC make it difficult to configure the conventional differential protection based on power frequency phasors.Additionally,the existing protection schemes have deficiencies in terms of speed and reliability.To address these problems,this paper proposes a sampled value differential protection principle for an SFC based on model verification.First,the operating principles and control strategies of an SFC are thoroughly studied,and a mathematical model that aligns with the SFC's working principles is constructed in the time domain using current sampled values.Then,a model verification method is applied to identify differences before and after a fault,and the corresponding protection criteria are established.Finally,an electromagnetic transient simulation model of the pumped storage unit's SFC startup is built in PSCAD/EMTDC to verify the effectiveness of the protection principle.Results show that the proposed protection principle is not affected by the frequency differences on both sides of the SFC,and exhibits excellent selectivity,fast response,and reliability.关键词
抽水蓄能/静止变频器/模型校核/电流采样值/差动保护Key words
pumped storage/static frequency converter(SFC)/model verification/current sampled value/differential protection引用本文复制引用
张大海,李宇欣,李猛,刚玉阳,周健,李小鹏..基于模型校核的静止变频器采样值差动保护原理[J].电力系统保护与控制,2025,53(4):27-36,10.基金项目
This work is supported by the Science and Technology Project of State Grid Corporation of China(No.5419-202243074A-1-1-ZN). 国家电网有限公司科技项目资助(5419-202243074A-1-1-ZN) （No.5419-202243074A-1-1-ZN）
