分布式能源功率倒送引发变压器过电流保护误动场景及对策  

Mal-operation scenarios and countermeasures of transformer overcurrent protection caused by power reversal of distributed energy resources

作　　者：饶丹青 翁汉琍[1,2] 郭祎达 李振兴[1,2] 黄景光[1,2] RAO Danqing;WENG Hanli;GUO Yida;LI Zhenxing;HUANG Jingguang(Hubei Provincial Key Laboratory for Operation and Control of Cascaded Hydropower Station,China Three Gorges University,Yichang 443002,China;College of Electrical Engineering&New Energy,China Three Gorges University,Yichang 443002,China)

机构地区：[1]三峡大学梯级水电站运行与控制湖北省重点实验室,湖北宜昌443002 [2]三峡大学电气与新能源学院,湖北宜昌443002

出　　处：《电力自动化设备》2023年第4期207-212,219,共7页Electric Power Automation Equipment

基　　金：国家自然科学基金资助项目(52077120)。

摘　　要：分布式能源的大规模并网可能引发系统发生功率倒送,从而给变压器过电流保护的性能带来影响。首先对分布式能源发生功率倒送的场景及其可能引发变压器过电流保护误动作的风险进行分析,然后根据分布式能源发生功率倒送时电气量的特征,将变压器的运行功率引入变压器过电流保护的整定计算中,构造一种基于变压器功率的自适应过电流保护方案,以识别上述工况。仿真结果表明,所提方案能够有效防止上述工况引发的变压器过电流保护误动作。The large-scale grid connection of distributed energy resources may cause power reversal in power system,which will affect the performance of the transformer overcurrent protection.Firstly,the scenarios of distributed energy resource power reversal and the risk of the mal-operation of transformer overcurrent pro⁃tection under these scenarios are analyzed.Then,according to the characteristics of the electrical quantities during the power reversal of distributed energy resources,the operating power of the transformer is intro⁃duced into the setting calculation of the transformer overcurrent protection.An adaptive overcurrent protection scheme based on transformer power is constructed to identify the above scenarios.The simulative results indicate that the proposed scheme can effectively prevent the mal-operation of transformer overcurrent protection caused by the above scenarios.

关 键 词：分布式能源 变压器 继电保护 过电流保护 功率倒送 自适应保护判据 

分 类 号：TM77[电气工程—电力系统及自动化]