Abstract
Regional protection based on multisource information of a regional power network depends on communication technology. A partition strategy considering communication constraints and implementation techniques must be considered to realize the regional protection of a large power grid. This paper aims at examining the technical requirements of rapid and reliable regional protection, considering the number of hops as the factor affecting communication between secondary substations and primary substations, and combining this with the equalization of substations. Then, a primary substation selection model of regional protection based on an exhaustive method is proposed using the Floyd–Warshall algorithm (an algorithm for finding shortest paths in a weighted graph). The partition model is further established according to the multifactors that affect the communication delay time for regional protection. Focusing on the N-1 channel fault in the preset region after the formation of the subregions, this paper analyzes the circuitous process of information in an interrupt channel and considers the influence of communication delay time to further improve the partition strategy. Finally, this paper puts forward techniques for partition strategy implementation based on graph theory; an example analysis of an actual power network is also given, and the conclusions of multiple partitions of the same power network are compared and analyzed. Besides this, partition suggestions and theoretical guidance considering actual engineering demands are given.
Highlights
The development of technology in this era has sped up the process of replacing traditional backup protection with regional protection
In order to achieve regional protection, a large power grid is divided into several regions, regional decision-making centers are set up, and multisource information in the region is collected by means of communication technology
Regional protection can solve the problems associated with traditional protection
Summary
The development of technology in this era has sped up the process of replacing traditional backup protection with regional protection. With the development of communication technology, regional protection which gathers multisource information for decision-making has been widely studied for addressing the shortcomings of traditional backup protection [4,5,6]. In order to achieve regional protection, a large power grid is divided into several regions, regional decision-making centers are set up, and multisource information in the region is collected by means of communication technology. The search process was repeated until the partition of the area was completed The methods of these studies are mainly based on the electrical topology of the power network, substation geographical location, or protection principle, according to the regional finite element or grid type to divide the area.
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