Abstract:In the process of power transmission, there are cases where power lines such as transmission lines, transformers, and bus bars are depleted to reduce power supply efficiency. Currently, reactive power compensation is commonly used to solve this problem.Therefore, the performance of the reactive power compensation device plays an important role in the safe and stable operation of the power system.However, there is currently no efficient means for reactive operation management,there is urgent need for a completely scientific approach to guidance.In view of the above problems and needs, this paper firstly applies the big data technology to build the data layer that supports the calculation and analysis of the evaluation indicators. According to the actual business demand analysis of the reactive operation evaluation of the generator set, a complete evaluation index system is proposed, including three secondary indicators, which are equipment availability, equipment depreciation rate and Equipment failure rate. Finally, the analytic hierarchy process is proposed. A comprehensive evaluation method combined with the entropy weight method. Applying the indicators proposed in this paper to evaluate the reactive operation of the grid-connected generator set, it can reflect the actual operation of the unit from an objective angle, and provide auxiliary decision-making for the professional management personnel of the grid operation.