Abstract: A method, resonance handling device and computer program product are disclosed for handling resonances in a power transmission system. The resonance handling device can include a resonance frequency determining unit configured to obtain measurements from measurement devices in the power transmission system, apply the measurements in at least one state space model and determine modal resonance frequencies in the system based on the application of the system measurements in the state space model, and an activity determining unit configured to determine the modal activity of at least one of the resonance frequencies.

Abstract: A method, resonance handling device and computer program product are disclosed for handling resonances in a power transmission system. The resonance handling device can include a resonance frequency determining unit configured to obtain measurements (y1, y2, yr) from measurement devices in the power transmission system, apply the measurements in at least one state space model (M1, M2) and determine modal resonance frequencies (?j) in the system based on the application of the system measurements in the state space model, and an activity determining unit configured to determine the modal activity of at least one of the resonance frequencies.

Abstract: A method, device and computer program product for the prediction of the stability of an electric power network, where the method is executed after a fault or contingency has occurred, and comprises the steps of (a) during a time interval in which the network is in a transient condition, determining for at least one load connected to the electric power network, at least one parameter describing an estimated steady state behavior of the load, (b) executing a load flow calculation for the electric power network using the least one parameter describing the estimated steady state behavior the at least one load, (c) determining, if the load flow calculation indicates stability has a solution, that a future stability of the electrical power network exists, or, if the load flow calculation indicates instability does not have a solution, that a future stability of the electrical power network does not exist.