Influence of Inverter-Interfaced Renewable Energy Generators on Directional Relay and an Improved Scheme

被引：109
作者：
Jia, Ke [1 ]
Yang, Zhe [1 ]
Fang, Yu [1 ]
Bi, Tianshu [1 ]
Sumner, Mark [2 ]
机构：
[1] North China Elect Power Univ, State Key Lab Alternat Elect Power Syst Renewable, Beijing 102206, Peoples R China
[2] Univ Nottingham, Nottingham NG7 2RD, England
来源：
IEEE TRANSACTIONS ON POWER ELECTRONICS | 2019年 / 34卷 / 12期
基金：
中国国家自然科学基金;
关键词：
Angular characteristics; directional relay; high-frequency impedance; renewable power sources; sequence super-imposed impedance; GRID-CONNECTED INVERTER; WIND POWER; PROTECTION CHALLENGES; DISTANCE PROTECTION; LCL FILTER; SYSTEMS; COORDINATION; INTEGRATION; RESOURCES; LINES;
D O I：
10.1109/TPEL.2019.2904715
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Renewable energy sources are typically interfaced to the grid using power electronics, which can cause their fault current characteristics to display significant low-frequency harmonics and unbalanced sequence impedances. Such current characteristics can lead to the operation failure of fault-component-based directional relays. To demonstrate the influence of inverter-interfaced renewable energy generators (IIREGs) on directional relays in detail, analytical expressions for the IIREG equivalent positive- and negative-sequence superimposed impedances are derived in this paper. Considering various factors, the angular characteristics of the sequence superimposed impedances are investigated. Based on these attributes, it can be concluded that fault-component-based directional relays may be unable to operate in some circumstances. A novel high-frequency impedance-based protection scheme is proposed to manage the adaptability problem by determining the fault direction due to a stable impedance angle. The theoretical analysis and the proposed scheme are tested and verified through real time digital simulation and field testing data.
引用
收藏
页码：11843 / 11855
页数：13
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