Abstract
A fuzzy logic rule-based system for assessing steady-state security of a power network with a ring structure is presented. The system uses the measurements of the network state, the information about the network configuration, physical knowledge about the system and rules to determine the security class. The security is determined in a hierarchical manner, first at the component level and then at the network level. The rules are obtained from experts in the field of power systems, and describe the approximate behavior of the network based on knowledge about the physical principles and the network topology. A new defuzzification operator is introduced, which allows the fuzzy logic system to follow different strategies such as risk aware operation. A graphical interface has been built for realizing effective interaction with the operators. The developed system has been tested on the 380 kV Dutch transmission network and it has been found that the classification corresponds to the opinion of experienced operators as to the security class.
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