This series is a reactor, specifically, ACL is a filter with a zero sequence reactance, the present invention for pure emotional zero sequence filter reactance of a normal current is infinite impedance, zero sequence harmonic current low impedance of the reactor, including the three-phase, three-phase three-phase connection and power, respectively, and are set in three-phase winding, same size to the strength of the magnetic induction through the pros and cons of each phase winding in opposite directions cancel each other out, the magnetic flux density of each phase is zero, the reactance for the high-impedance three-phase AC, three-phase alternating current is almost not pass the zero sequence harmonic current, low impedance, zero sequence harmonic current is almost entirely flow through such can make the three-phase alternating current safe passage of zero sequence harmonic lead to side,the power possible to filter out the zero-sequence harmonic.

DCL is used in the inverter above, the main function is to reduce the high harmonic content of the power supply side, to improve the inverter input power factor from 70% to more than 90% inhibition due to input voltage unbalance caused by the three-phase current balance.