Abstract:As the integrated operation trend of power grid monitoring operation becomes more and more obvious and the application of big data technology is becoming increasingly mature and popular. It provides a solution for the analysis and application of power grid monitoring big data with characteristics of multiple sources, high dimension and heterogeneous. This paper presents a unified modeling method for the big data analysis system of intelligent power grid monitoring and operation. Then, it analyzes the data source, data range, current status and existing problems of monitoring big data, and points out the problems and ideas of data modeling. A public model using metadata idea and an application model based on business need are constructs. In terms of data access and storage management, a metadata model is defined. In order to provide model support for efficient and standardized access to multi-source data, this paper builds a device-centric monitoring data association model based on access and summary of data sources related to monitoring business and realize unified modeling of data objects. At the same time, the metamodel conforming to the modeling idea is defined. The metamodel constrains the modeling behavior and ensures that the established model complies with the domain constraints to lay the groundwork for the upper intelligent monitoring big data analysis application.