Research on time process-oriented power system static security analysis

In allusion to the fact that the traditional off-line security analysis based on the data of one time section can not adapt to the continuous state change of power system appropriately, a time process-oriented security analysis method is presented in the paper. The basic idea of time process-oriented method is explained. With the abundant measurements and load forecasting information, the characteristic vector of each time section is extracted. The load curve is partitioned into several time sub-processes by the improved K-means clustering algorithm considering the successive time series of power load. The indices extracting the maximum and minimum characteristic sections of every time sub-process are defined. Then the representativeness of the characteristic sections is verified. While ensuring the static security, the time process-oriented method can improve the transmission efficiency to some extent. The calculation and analysis of IEEE 30-bus system shows the effectiveness of the method proposed in the paper.