Practicable Cascading Failure Process Prediction Analysis Scheme and System Development Based on Multiple Information Sources

Abstract

Power grids in China are in the stage of rapid development of UHV AC and DC. Cascading failures with timing and propagation characteristics become the main threat to power grid security. Based on the EMS and WAMS information and according to the principle of practicality, a practicable scheme for cascading failure prediction and analysis is proposed. And the related analysis system has been developed. In line with the timing development characteristics of cascading failures, the overall system layered architecture and key technologies are proposed. The access relationship of the main sub-function modules of the system is explained. Firstly, the EMS and WAMS multiple source data integration technologies are described. Furthermore, comprehensively considering the variation of power grid structure and state changes, the vulnerability component set identification is realized. Thirdly, on the basis of the set of vulnerability elements, the full dynamic process simulation program is used to select and check progressive cascading fault sets automatically, which can consider the effects of relay protection and security control equipment. Finally, in view of the possible serious faults, aiming at the weak section in the fault propagation path, the corresponding power flow auxiliary adjustment strategy is presented.