POWER QUALITY IMPROVEMENT BY ACTIVE FILTER

摘要

The present invention relates to a method for suppressing one or more harmonic currents in a power supply network, said harmonic currents being generated by one or more loads operationally connected to said power supply network, the method comprising the steps of providing an active power filter comprising an electronic inverter comprising a number of controllable switches, said electronic inverter being operatively connected to an LCL-filter forming part of said active power filter, and providing PWM control signals to each of said controllable switches in response to a particular harmonic current or particular harmonic currents to be suppressed in the power supply network, said PWM control signals varying in response to a value of at least one measured electrical parameter. Moreover, the present invention relates to an active power filter suitable for carrying out the before-mentioned method.