Research on Coordinated Adjustment Method of System Protection and Communication System under the Typical Fault Scenarios

With the rapid development of ultra-high voltage (UHV) inter-regional interconnected power grid and the wide application of a large number of power electronic devices, the security and stability characteristic of power grid is becoming more and more complex, and the risk of safe operation is increasing day by day. To further adapt to the power grid situation, in recent years, the State Grid Corporation of China has put forward the requirement of building a comprehensive security defense system for the large power grid, namely “system protection”. System protection is an emergency control system based on wide area information collection, rapid fault diagnosis and isolation, multi-resource collaboration, and other functions. It covers many sites and the coupling relationship between device strategies is complex. At the same time, due to the limitation of control resources, the cross configuration between strategies is gradually increasing, and the influence range of local system anomalies is becoming larger and larger. Its complexity and hidden dangers lead to a significant increase in the risk of power grid operation. At present, there is little literature on how to reduce the risk of power grid safe and stable operation caused by the failure of the system protection itself through effective coordinated adjustment. In this paper, a coordinated adjustment method based on typical expected fault scenarios of system protection is proposed. For typical expected fault scenarios of system protection with unacceptable risks, certain measures are taken in advance to reduce the possible risks to the power system.