System stability monitoring apparatus and method

A system stability monitoring apparatus which monitors system stability of a power system comprising:

• a measurement information collecting unit that collects measurement information at a plurality of points in the power system at a plurality of times, where each of the points is associated with a respective power generator, a respective load, or a respective phase modifier;
• a vibration analyzing unit that calculates vibration information at the plurality of points using the measurement information, the vibration information including a plurality of vibration frequencies, a plurality of attenuation coefficients, a plurality of amplitudes, and a plurality of initial phases;
• an information storage unit that stores point information including position information for each of the plurality of points;
• a vibration classifying unit that classifies the vibration information as a plurality of vibrations based on the point information to distinguish the plurality of vibrations at the plurality of points, where each of the vibrations includes a respective vibration frequency, one or more points corresponding to the respective vibration frequency, and respective attenuation coefficients, respective amplitudes and respective initial phases corresponding to the one or more of the points corresponding to the respective vibration frequency;
• and
• a display unit that displays the vibration information for at least a first vibration and a second vibration of the plurality of vibrations and displays a system diagram of the power system which includes a first region indicating the one or more points corresponding to the first vibration and a second region indicating the one or more points corresponding to the second vibration,
• wherein the point information includes at least one of latitude information and longitude information of each the plurality of points, impedance information between the plurality of points, and characteristic information of at least one of the respective power generator, the respective load, and the respective phase modifier associated with the each of the plurality of points.

A system stability monitoring method which monitors system stability of a power system comprising:

• collecting measurement information of a plurality of points in the power system at a plurality of points;
• calculating vibration information at the plurality of points using the measurement information, the vibration information including a plurality of vibration frequencies, a plurality of attenuation coefficients, a plurality of amplitudes, and a plurality of initial phases;
• and
• classifying the vibration information as a plurality of vibrations based on point information, that includes geographic position information for each of the plurality of points, to distinguish the plurality of vibrations at the plurality of points, where each of the vibrations includes at least one of the respective vibration frequencies, one or more points corresponding to the at least one of the respective vibration frequencies, and respective attenuation coefficients, respective amplitudes and respective initial phases corresponding to the one or more of the points corresponding to the at least one of the respective vibration frequencies;
• calculating a respective importance degree for each of the plurality of vibrations based on the respective amplitudes and the respective attenuation coefficients thereof;
• and
• displaying the vibration information for at least a first vibration and a second vibration of the plurality of vibrations and a system diagram of the power system which includes a first region indicating the one or more points corresponding to the first vibration and a second region indicating the one or more points corresponding to the second vibration,
• wherein the respective importance degree for the first vibration and the respective importance degree for the second vibration are higher than a predetermined value.