IMPROVING CURRENT PROTECTION AGAINST SHORT CIRCUIT OF SMART-GRID 6–35 KV NETWORK USING STRUCTURAL-INFORMATION METHOD. PART 1. ANALYSIS
Journal Title: Наукові праці Донецького Національного Технічного Університету серія: Електротехніка і Енергетика - Year 2017, Vol 1, Issue 1
Abstract
A proposed method is presented for methodical improvement of the algorithms of relay pro-tection and automation for the implementation of the concepts of "Smart -grid", "Digital cell", "Digital substation", and "Outsourcing of services" in the war-dividing power grids. The method has been developed in a number of articles on the structural-information (SI) method of dynamic pattern recognition. As examples of perfection, it deals with the construc-tion of an information sensor for the recognition of situations including "Short-circuit through the earth", "Cut-off–Max-imum overcurrent protection" for non-directional and directional overcurrent protection. According to the method, a nu-merical comparative analysis of the efficiency of the algorithms is carried out based on the systematization of their structures and semantic network situations, then the results are restructured and generalized. Comparative analysis is presented of 11 non-directional single input variants and 12 multi-directional algorithms for "Cut-off–Maximum over-current protection". The analysis is performed similarly to the systematization of the algorithms for selective search for single-phase earth faults, as shown in previous articles. The reasons for the instability of the operation of the famous current protections are investigated. According to the SI method, all these controlled the oscillating circuit network. So part of the control circuit is selected for blocking a part of the other control circuit. As replacement criteria for their work on the two algorithms, selective search performance in the network and faults in equipment are suggested. The possibility is investigated of introducing in the algorithms of the generator a semantic s ignal for the implementation of the three semantic detectors algorithm relay "Survivability", "Efficiency". Consideration is given to transferring from the devices only meaningful signals, and then combining them at a higher level of protection and management. Methods are devel-oped for automatic conflict resolution arising from the work of the network, for maintaining the declared functional sta-bility, and the implementation of tasks for further automation of the regulatory guidance. The results allow us to form recommendations for improving the quality characteristics of the devices according to these concepts.
Authors and Affiliations
V. F. SYVOKOBYLENKO, A. P. NIKIFOROV, Oleksandr Kollarov, Dmytro KARDASH
Keywords
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