Multi-Agent System을 이용한 배전계통 자율 적응 최적 보호 시스템 = An Adaptive Optimal Protection system for Power Distribution Networks using Multi-Agent System

다국어 초록 (Multilingual Abstract)

The topology of the power distribution network with protection scheme using over current relay is changed frequently because of load change, maintenance, mending and so on, but the setting values of protective devices are maximum values to ignore load and topology changes of the distribution network. Therefore the protection system can't isolate the light fault from distribution system. Currently, multi-agent system is focused one's attention on the world. And also the protective device is made by digital component and it has communication ability through the influence of communication technology. Because of these reasons, "an adaptive optimal protection of a distribution system network using multi-agent system" is proposed to apply multi agent system for automatic operation of protective system in this paper. The characteristic of multi-agent system has autonomy that is self-start ability and intelligence, with own knowledge, reasoning and judging ability. The agent works together to achieve a global goal, in which case each agent does the given job only. A protective agent of the proposed system has two autonomous functions with basic the protective function. One is the detecting function of network change. The other is the resetting function for optimal protection of a distribution system by coordinating with neighbor agents. When the fault is detected on network, agents isolate fault from network, then it sets parameters to new operation conditions by collaborating with other device agents. This system has adaptive protection with optimization "Protectability" applying protection. It is the "Protectability" concept for evaluation of protection system to describe how the system is well protection by an index numerical value. This system can operate optimal protection, because it detects adequate parameter by optimal method based on collaboration with neighbor agent. The purpose of proposed paper is development of system which has automatic detection of network change and rapidly automatic adaptation against network change with optimal method to set adequate parameter for complete protection.