| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an active filter which is able to precisely realize the control of a harmonic current, even when a plurality of AC loads are connected to a single AC power source. <P>SOLUTION: The active filter 16 acts to negate a harmonic current which arises in an AC power supplied to each of the AC loads 3 and 4, when a plurality of AC loads 3 and 4 are connected to a single AC power source 1. Corrected current components which are obtained by extracting fundamental wave components of the current of AC power to be supplied to AC loads 3 and 4 and adding up current components, consisting of differences between a corrected fundamental wave current waveform, having shifted the phases of the fundamental wave components of the current concerned for each of the AC loads 3 and 4 so as to conform to the phase of predetermined waveform and a current waveform of AC power to be supplied to the AC loads 3 and 4, separately for each current to be supplied to each of the AC loads 3 and 4, and inverting them after addition, or adding them up after inversion, are superimposed to the AC power source 1. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
