| 摘要 |
<p>PROBLEM TO BE SOLVED: To allow estimating individual currents consumed by a plurality of devices based only on a total current. SOLUTION: An apparatus for estimating power consumption is provided with a total current meter 11 for measuring a total load current to an electric supply line 2 of a customer 1, a fast fourier transform apparatus 12 for transforming the total load current into a fundamental wave and higher harmonic waves of the total load current, a temporal difference apparatus 13 for finding changes of the currents of the fundamental wave and the higher harmonic waves in the converted current, an independent component analyzing apparatus 14 for separating the changes of the currents into components estimated as groups of the devices respectively having the same intensity ratio of higher harmonic wave based on independent component analysis, and an apparatus 15 for separating signals per device for estimating an operating status (the change of the current) per device 3 to be monitored based on a waveform of the change of the current per component of the same intensity ratio of higher harmonic wave. The changes of the currents of the fundamental wave and the higher harmonic waves are separated into the components estimated as the groups of the devices respectively having the same intensity ratio of higher harmonic wave based on the independent component analysis. The change of the consumed current per device to be monitored is estimated based on the waveform of the change of the current per the same intensity ratio of higher harmonic wave.</p> |
