摘要
微电网中含有大量的分布式电源,且具有很多不同于传统配电网的特点,传统配电网中的保护方案难以满足其对可靠性与稳定性的要求。基于微电网的结构和故障特点,建立了含多个逆变型分布式电源的微电网故障网络模型,提出了一种基于零序非工频分量注入的微电网接地故障保护方案。该方案利用注入的零序非工频电流产生的故障特征,能够正确识别并切除微电网内部的各类接地故障,且同时适用于并网和孤岛2种运行方式。最后,在PSCAD/EMTDC软件中进行了仿真分析,结果验证了所提保护方案的有效性与可靠性。
Microgrids contain many distributed generators,and have many characteristics different from those of traditional distribution network.The protection schemes for traditional distribution network are difficult to meet the requirements of microgrid operation.Based on the topology and fault characteristics of microgrid,a microgrid fault network model with multiple inverter interfaced distributed generators is established,and a grounding fault protection scheme for microgrid based on zero-sequence off-nominal frequency component injection is proposed.With the fault characteristics generated by the injected zero-sequence off-nominal frequency current,the scheme can correctly identify and remove all kinds of grounding faults in microgrid,and is suitable for both grid-connected and islanded modes.Finally,the proposed protection scheme is analyzed and simulated in PSCAD/EMTDC,the results verify the effectiveness and reliability of it.
作者
赵怀健
牟龙华
方重凯
ZHAO Huaijian;MU Longhua;FANG Chongkai(College of Electronics and Information Engineering,Tongji University,Shanghai 201804,China)
出处
《电力自动化设备》
EI
CSCD
北大核心
2022年第11期25-31,共7页
Electric Power Automation Equipment
基金
中央高校基本科研业务费专项资金资助项目(22120210164)。
关键词
微电网
继电保护
逆变型分布式电源
注入法
零序分量
非工频分量
microgrid
relay protection
inverter interfaced distributed generator
injection method
zero-sequence component
off-nominal frequency component
