Abstract: The present invention relates to a method of monitoring oscillations that are liable to interact in an electrical power network, in dependence on measurement of AC waveforms in the electrical power network. The method comprises receiving first waveform data corresponding to an electrical quantity in each phase of at least two phases of three-phase AC waveforms at a location in the electrical power network. The method further comprises applying a transformation to the first waveform data to provide therefrom second waveform data corresponding to an electrical quantity at the location in a single phase representation, the second waveform data depending on the at least two phases.

Abstract: A method of controlling an electrical power network in which a sudden event which may lead to loss or excess of generation or load. The electrical power network comprises plural controllers, each controller configured to control an apparatus connected to the power network at a different respective location in the electrical power network. The method comprises determining the occurrence of the sudden and receiving synchronised quantities in each of the controllers each of the quantities corresponding to one of frequency and angle at respective different locations in the electrical power network. The method further comprises generating a control output from each controllers in dependence on the received plural quantities, each control output controlling its respective apparatus, each controller generating the control output independent of operation of any other controller and on an ongoing basis in dependence on ongoing receipt of the plural quantities.

Abstract: A method for identifying a faulted DC power transmission medium in a multi-terminal DC electrical network is provided. The DC electrical network includes multiple terminals connected via DC power transmission media. The method includes detecting a fault occurring in the DC power transmission media and, after detecting the fault, measuring a surge arrival time at each terminal, each surge arrival time being the difference between the time of detecting the fault and the time of arrival of an electrical wave surge generated by the fault at the corresponding terminal. The method further includes comparing the surge arrival times between the terminals to identify DC power transmission media in which the fault is not located, allocating a healthy status to the media in which the fault is not located, and identifying the faulted DC power transmission medium as being the DC power transmission medium/media without a healthy status.

Abstract: A method of controlling an electrical power network in which a sudden event which may lead to loss or excess of generation or load. The electrical power network comprises plural controllers, each controller configured to control an apparatus connected to the power network at a different respective location in the electrical power network. The method comprises determining the occurrence of the sudden and receiving synchronised quantities in each of the controllers each of the quantities corresponding to one of frequency and angle at respective different locations in the electrical power network. The method further comprises generating a control output from each controllers in dependence on the received plural quantities, each control output controlling its respective apparatus, each controller generating the control output independent of operation of any other controller and on an ongoing basis in dependence on ongoing receipt of the plural quantities.

Abstract: The present invention relates to a method of monitoring oscillations that are liable to interact in an electrical power network, in dependence on measurement of AC waveforms in the electrical power network. The method comprises receiving first waveform data corresponding to an electrical quantity in each phase of at least two phases of three-phase AC waveforms at a location in the electrical power network. The method further comprises applying a transformation to the first waveform data to provide therefrom second waveform data corresponding to an electrical quantity at the location in a single phase representation, the second waveform data depending on the at least two phases.

Abstract: A method for identifying a faulted DC power transmission medium in a multi-terminal DC electrical network is provided. The DC electrical network includes multiple terminals connected via DC power transmission media. The method includes detecting a fault occurring in the DC power transmission media and, after detecting the fault, measuring a surge arrival time at each terminal, each surge arrival time being the difference between the time of detecting the fault and the time of arrival of an electrical wave surge generated by the fault at the corresponding terminal. The method further includes comparing the surge arrival times between the terminals to identify DC power transmission media in which the fault is not located, allocating a healthy status to the media in which the fault is not located, and identifying the faulted DC power transmission medium as being the DC power transmission medium/media without a healthy status.