Online pre-analysis and real-time matching for controlled splitting of large-scale power networks

System splitting is that the dispatching center controls the splitting of a power network to form designed islands when loss of synchronism occurs. This paper describes and compares three possible ways to realize real-time decision-making of system splitting, and shows that online pre-analysis & real-time matching (ONPARM) is a recommendable way under current technological conditions. An ONPARM system-splitting scheme is presented, and related techniques are described. Simulations on the IEEE 118-bus system show that the scheme can meet the requirement of real-time decision-making. The scheme can be combined with existent emergency control (non-system-splitting) schemes to form a unified real-time security control scheme containing system splitting