A new load survey method and its application in component based load modeling

A new load survey method, which combines load screening on all substations with detailed investigation of typical substations, for synthesis load modeling (SLM) is presented. Firstly, the main process of load survey is described; then the classification indices based on load characteristics and the principle of load `classification are expounded in detail, on this basis the census table of load characteristics is drawn up and both sources of survey data and objects to be surveyed are decided; and then, the statistical analysis on load characteristic data from general survey is performed and by use of the results of survey and statistics the 220kV substations, i.e., the load nodes, are classified. Taking the regionality of substation locations into account, the principle to select typical substations, in which the load constituents and types are considered, is proposed, and according to the proposed principle typical substations for each kinds of loads are chosen, and the detailed census forms for these typical loads are designed. Using the proposed method, the survey with higher accuracy can be achieved under relatively low survey complexity. The proposed load survey method is successfully applied in Central China Power Grid, North China Power Grid, Northwest China Power Grid and Northeast China Power Grid.