Intelligent substation SCL (substation configuration description language) file difference comparison method

The invention discloses an intelligent substation SCL (substation configuration description language ) file difference comparison method, which is applicable to the situation that the SCL configuration file is changed in the building process, reconstruction and expansion process and the operation overhauling process of an intelligent substation. According to a definition of the SCL file in IEC61850-6 standard, a key word is defined for each key element, a two-dimensional table structure with a main key is formed, the difference of two SCL files on the aspects of the structure, element and attribute before and after the alternation can be rapidly found out by utilizing a circulating, sorting and cross comparison method, and an SCL file difference comparison software is developed on the basis of the obtained difference and can be used as a management tool of a configuration file in the operation maintenance of the intelligent substation.