High-frequency current compensator and air-conditioning system

A harmonic current compensating device comprising a power converter including at least a pair of arms each including a switching element, the harmonic current compensating device being configured to drive the switching element and supply compensating current to load current flowing between a system power source and a harmonic generating load, wherein

• the harmonic current compensating device comprises
• a compensating device side noise filter including a noise suppression capacitor and a noise suppression reactor, the compensating device side noise filter being configured to suppress noise of the compensating current, the noise of the compensating current being generated by the drive of the switching element, and
• a ripple filter including a ripple suppression capacitor and a ripple suppression reactor, wherein
• the ripple filter is configured to suppress ripple of the compensating current,
• the switching element is configured to operate at a frequency higher than a switching frequency of the harmonic generating load, and
• the noise suppression capacitor has a smaller capacity than the ripple suppression capacitor.