| 摘要 |
<p>An active filter comprises a bi-directional inverter (INV1) for delivering/leading in a compensation current used for compensating a harmonic current generated from a load connected to a commercial power supply, a capacitor (C1) connected to the DC side of the bi-directional inverter (INV1) and serving as a compensation current supply, a current transformer (CT1) for detecting a current component flowing into the commercial power supply, and a voltage transformer (PT) for detecting the voltage component of the commercial power supply. The bi-directional inverter (INV1) is controlled in accordance with a synthesis signal of a commercial current detection signal detected by the current transformer (CT) and a commercial voltage detection signal detected by the voltage transformer (PT).</p> |
