Shunt-connected active correction devices (ACD)

IEC 63497:2026, which is a product standard, is intended to specify the EMC, performance and safety requirements of shunt-connected active correction devices (ACD) with rated system voltages not exceeding 1 000 V AC or 1 500 V DC.

These devices can be either cord or permanently connected. They can be movable, stationary, or fixed devices.

An ACD includes both a static VAR generator (SVG) and an active harmonic filter (AHF).

The primary function of a shunt connected ACD is to do one or more of the following:

- active harmonic filtering;

- reactive power compensation;

- unbalanced load compensation.

Additional functions of a shunt-connected ACD, not addressed by this document, can be the following:

- flicker compensation;

- interharmonic component filtering.

In case of hybrid devices, combining a passive harmonic filter and an ACD, this document covers only the active part.

This document does not cover

- active mitigation functions part of another device (variable speed drive, uninterruptible power supply, dynamic voltage restorer, etc.),

- switched power capacitors,

- switched inductors,

- passive harmonic filters,

- energy storage converters, and

- series-connected