Research on Operation State Evaluation of Power Plant Key Transformer Equipment Based on Fuzzy Analytic Hierarchy Process

A multiple criteria decision making model of ordinary oil-immersed transformers replacement priority with high overload capacity distribution transformers (HOCDT) in self-use power system of thermal power plant is proposed in this paper. The decision making model consists of device property assessment and health condition assessment. The details of various assessment methods include device property assessment based on fuzzy analytic hierarchy process (FAHP) and health condition assessment method based on fuzzy synthetic evaluation. Integrating the device property assessment results and the health condition assessment results, we get a more comprehensive priority assessment result. An actual self-use power system of thermal power plant is utilized to validate the model and the numerical results testify that: the assessment model considering multiple aspects related to this problem could give a more comprehensive assessment result than just considering one of them and an appropriate priority scheme of transformers replacement obtained. The research in this paper could provide a feasible reference for self-use power system of thermal power plant to prioritize the replacement of ordinary distribution transformers.