Abstract
W ide-area protection system (WAPS) is widely studied for the purpose of improvi ng the performance of conventional backup protectio n . In this paper, the system architecture of WAPS is proposed and its key technologies are discussed in view of engineering projects . So a mixed structure-centralized-distributed structure which is more suitable for WAPS in limited power grid region, is obtained based on the advantages of the centralized structure and distributed structure. Furthermore, regional distance protection algorithm was taken as an example to illustrate the functions of the constituent units . F aulted components can be detect ed based on multi-source imformation fuse in the algorithm. A nd the algorithm can not only improved the selectivity, the rapidity, and the reliability of relaying protection but also has high fault tolerant capability . A simulation of 220 kV grid systems in Easter Hubei province showed the effectiveness of the wide-area protection system presented by this paper.
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