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The 28 September 2003 blackout in Italy raised doubts about the ability of distance relays in distinguishing voltage collapse and remote short-circuits. The combined presence of reduced voltages and high power flows may trigger distance relays, with the consequent tripping of healthy lines, reducing the system survivability. The paper addresses an analysis of the behavior of distance protections during...
Modern real-time measurement equipments and associated communication/computing networks allow developing advanced power system control architectures able to identify dangerous states of the network, and, when necessary, evaluate and apply remedial control actions. An approach, derived by a dynamic optimization methodology, for evaluating response-based control actions and improving power system security,...
Real-time monitoring of power system dynamics can help in identifying poorly damped modes of oscillation and possible threats to the security of the system. System monitoring can avoid or mitigate the effects of black-outs if equipped with a good man-machine interface. In this paper, a monitoring architecture based on wavelet spectral analysis and WAMS is proposed. The wavelet analysis of real-time...
Summary form only given. Although FACTS devices and UPFCs proved to be powerful tools for the exploitation of network capacities, their performances with regard to transient stability have not been deeply explored yet. In this work, we propose a methodology to assess preventive control actions through adjustments of UPFC reference signals. This control action does not imply changes in the generation...
Summary form only given, as follow. The implementation of a transient security dispatch (TSD) algorithm for real-time applications is presented. The algorithm, based on the generalized reduced gradient (GRG) method, processes collectively a set of contingencies in order to ensure transient stability for all postulated cases. The massive computation has been decomposed on a cluster of workstations,...
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