PARALLELING OF ACTIVE FILTERS WITH INDEPENDENT CONTROLS

摘要

A parallel filter arrangement with at least two filters supplying current in line side sensing configuration and a number of sensors for measuring current. The sensors are used to determine the amount of current being supplied by the filters and the amount of current being supplied by a source. The filters adjust their supplied current in order to reduce or eliminate the amount of reactive or harmonic current being supplied by a source.

主权项

1. A parallel filter arrangement for use with a circuit having a current and at least one non-linear load connected thereto comprising:
a first filter capable of producing a first current; a second filter capable of producing a second current; a third filter capable of producing a third current; a fourth filter capable of producing a fourth current; a first means for generating a first signal representing an error between the first and second currents; a second means for generating a second signal representing an error between the third and fourth currents; a third means for generating a third signal representing an error between the combination of the first and second currents and the combination of the third and fourth currents; a fourth means for generating a fourth signal representing the current of the circuit; wherein the first, second, third and fourth filters are electrically coupled to the circuit at locations downstream of the first current sensor-location of the source current of the circuit as represented by the fourth signal; wherein the first filter produces the first current and the second filter produces the second current based at least in part upon the first, third and fourth signals; and wherein the third filter produces the third current and the fourth filter produces the fourth current based at least in part upon the second, third and fourth signals.