HARMONIC CURRENT COMPENSATOR AND AIR-CONDITIONING SYSTEM

摘要

A harmonic current compensator is connected in parallel with a harmonic generating load to a system power supply and supplies a compensation current Ia to limit a harmonic component contained in a load current IL to be input from the system power supply to the harmonic generating load. The harmonic current compensator includes: a load current detector that detects the load current IL; a compensation current detector that detects the supplied compensation current Ia; a control amount computing portion that computes a control amount of the compensation current Ia based on the harmonic component contained in the load current IL detected by the load current detector and the compensation current Ia detected by the compensation current detector; and a limiter that limits an upper limit of the compensation current Ia.

主权项

1. A harmonic current compensator connected in parallel with a load to a system power supply and configured to supply a compensation current to limit a harmonic component contained in a load current to be input from the system power supply to the load, the harmonic current compensator comprising:
a load current detection portion configured to detect the load current; a compensation current detection portion configured to detect the compensation current; a control amount computing portion configured to compute a control amount of the compensation current based on the harmonic component contained in the load current detected by the load current detection portion and the compensation current detected by the compensation current detection portion; and a limiter configured to, when the control amount computed by the control amount computing portion exceeds a preset value, limit the control amount to the preset value.