A Diagnosis Method for Water-Steam System of Power Plant Based on Credibility Theory

In view of the uncertain relationship between faults and symptoms in the water-steam system of power plant, this paper proposed a fault diagnosis method based on credibility theory. A fuzzy diagnosis model which is practical and effective was constructed by describing the issues of knowledge representation, choice of control mechanism and construction of uncertain algorithm. Simultaneously, in order to diminish diagnosis errors, this paper proposed a new setting method of rule confidence for credibility rule and made this diagnosis method closer to experts´ thinking.