Research on Inter-Access Between Online and Offline Simulation During Real-Time Dynamic Security Assessment of Power System

Utilizing actual operational data and network model parameters of power system, the real-time dynamic security assessment traces and analyzes power flow, stability, short-circuit current and transmission limit of power system, and evaluates transient and dynamic stability of power system. Offline simulation researches congeneric problems, however, in respect of unit output and load distribution typical operation modes are utilized. Due to the differences among administration sections, which utilize model parameters, there are a certain differences among model parameters for them. It is very valuable and necessary for offline simulation to perform data exchange with real-time dynamic simulation. Taking real-time dynamic (transient) security analysis and early warning system of North China Power Grid for example, in this paper the key problems in interception and modification of dynamic system data as well as in uploading, calculus and result restoring of offline data during the inter-access between online and offline simulation are researched, and corresponding solutions for these problems are given and applied in engineering project, thus the inter-access and data exchange between real-time dynamic security assessment system and offline simulation system are implemented.