Line filter (LCL)

 LCL filter, also called line filter, is specially designed to suppress the switching frequency components caused by the rectifiers’ semiconductors (IGBTs). It consists of a parallel-series combination of reactors and capacitors adapted to reduce the THD(i) of rectifiers.
  • Active supply unit is controlled to eliminate low order harmonics in the current
  • Line filter suppresses components above the switching frequency of the active supply unit IGBTs

In an ABB low harmonic drive, the use of Direct Torque Control (DTC) principles, together with a low pass filter, will suppress the current harmonic content leaving total harmonic distortion (THD) of less than 3%. The resulting clean sinusoidal current will therefore cause little or no distortion on the network voltage waveform.

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