What is special in ABB's ultra low harmonic drive?

ABB's ultra low harmonic drive solution uses advanced harmonics mitigation
technology that does not require external filters or multi-pulse transformer. These
drives utilize an active front-end rectifier with a LCL (inductor - capacitor - inductor)
filter. The low line harmonic content of the ACS800-U31 and -37 AC drives fulfil the
strictest harmonic requirements including IEEE519-1992 at the drive's input
terminals. This makes ABB's ultra low harmonic drive a simple and compact solution
for low harmonic AC drive.
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