Search International and National Patent Collections
|1. (WO2018061352) CONTROL DEVICE FOR ACTIVE FILTER|
|Applicants:||DAIKIN INDUSTRIES, LTD.
|Title:||CONTROL DEVICE FOR ACTIVE FILTER|
Provided is a control device (71) controlling the operation of an active filter (6) that is connected in parallel with a load (2) at an installation point (P) with respect to an AC power supply (1) and supplies a compensation current (Ic) to the installation point so as to compensate for harmonic components of a load current (Io) flowing through the load. The control device is provided with: a dq converter (703) that converts the load current (Io) into a d-axis current component and a q-axis current component; high-pass filters (704, 705) that extract harmonic components from at least the d-axis current component output of the dq converter; and multipliers (716, 717) that output, as current command values, the result obtained by multiplying the d-axis current component output of the high-pass filter and the q-axis current component output of the dq converter or the high-pass filter by respective compensation factors (Kd, Kq). The compensation factor (Kq) of the q-axis current in the multiplier can be adjusted.