Improvement of Electric Power Security

ONS continually works to add more security to the BIPS performance through various initiatives. Dueto the network topology characteristics, the system’s operational security is subject to different degrees ofrisk of accidental transmission shutdownor generation.

Although the BIPS is designed to facesingle contingencies (n-1 criterion), it is subject to more severe disturbances, triggered by sequences of events, which can occasionally lead to the simultaneous shutdown of more than one of the network components violating the referred criterion . Depending on the affected facility, consequences can be more severe, involving the shutdown of large amounts of consumers.

In order to minimize the chance of occurrence of a major disturbance, restricting the spread of a disorder and speed the loads restoration up, it is necessary to keep permanent observation, analysis, diagnosis and prevention of these events.

Considering the combinatorial nature of the problem, as well as the particularity of the events and system settings before and after disturbances, the post-operation analysis in major disturbances provides important input for the creation of preventive measures and for thereinforcement of the system security.

In 2015, a Special Protection System (SEP) was implemented. The system is able to identify the loss of large energy blocks, such as the loss of an Itaipu or Madeira Complex Bipole, dropping generation atTucuruí hydro plant so thatsystem stability is controlled, avoiding a disturbance spread with more severe consequences. This SEP has its operations related to the exports scenario of the Northern Region to the Southeastern Region.