COMPENSATING CURRENT DETECTION CIRCUIT amp; ITS DETECTION OF POSITIVE POWER FILTER

摘要

The present invention relates to a compensation current detection circuit of an active power filter and a method of detecting the same. In the conventional active power filter, since a division by voltage is required to obtain a load compensation current value of the dq axis, the calculation time due to the division is delayed. Compensation delay occurs due to harmonic compensation and compensating for changing load characteristics. Therefore, it is difficult to quickly and accurately compensate the instantaneous load current, and the detection unit needs to modify hardware to perform various functions such as harmonic suppression, power factor correction, flicker control, unbalanced current cancellation, and voltage fluctuation suppression.;In view of such a conventional deficiency, the present invention allows the compensation current to be obtained by first performing a DQ conversion without dividing, and then calculating the compensation current using a microprocessor to prevent the calculation delay and compensation delay. In addition, there is an effect to compensate for the rapid and accurate instantaneous load current.