Abstract
The urgent problem of the relaying protection in the modern AC/DC hybrid connected grid and the development of the wide area communication, the information process and the intelligent technology powerfully promotes the development of the technology of the wide area relaying protection (WARP), which has become a research hotspot that attracts extensive attention. Originated from the basic concept of the wide area relaying protection, this paper analyses the advantages, the effects and the functions of the wide area relaying protection. The two main approaches to realize the wide area protection, which are on-line adaptive setting (OAS) principle and fault element identification (FEI), are introduced in this paper. Aimed at improving the performance of the backup protection, the research content and the technology demand of the wide area protection are proposed, meanwhile, the basic principle and the algorithm of the fault element identification are introduced. At last, the scheme of the limited wide area relaying protection based on the existing pilot channel of the main protection is discussed.
Highlights
Because of the extremely unbalance distribution of the electrical load and the energy in China, the Chinese power grids are required to transport the large-scale electrical power from the west to east over long distances, of which the scale is expanding rapidly, the structure is becoming more and more complicated, the technology continues to improve and the operation is flexible and changeable
The limited wide area protection As mentioned before, the limited wider area protection that is based on the limited information can identify the fault element and improve the performance of the backup protection, can speed up the remote backup protection under the condition of the substation DC power supply failure
The urgent problem of the relaying protection in the modern AC/DC hybrid grid and the development of the wide area communication, the information process and the intelligent technology powerfully promotes the development of the technology of the wide area protection
Summary
Because of the extremely unbalance distribution of the electrical load and the energy in China, the Chinese power grids are required to transport the large-scale electrical power from the west to east over long distances, of which the scale is expanding rapidly, the structure is becoming more and more complicated, the technology continues to improve and the operation is flexible and changeable. Yin et al Protection and Control of Modern Power Systems (2016) 1:12 primary protection refuse to operate due to low sensitivity and the breaker fails to trip or loss of protection power, resulting in the local grid disaster. Another example is that, during the large-scale power flow transfers in the power system, the unexpected cascading tripping of the backup protection may occur, which is the main reason for the accident extension and even the large area blackout [1,2,3]. The scheme of the limited WARP technology with high reliability and speed based on the existing pilot channel of the main protection is discussed
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