Digital adaptive control of a three phase dynamic power filter under unsymmetrical loading conditions

A digital adaptive current controller for implementation on a three-phase voltage source inverter is proposed for a demonstration 40 kVA dynamic power filter (DPF). The digital dynamic compensator controller is based on a TMS320E15 digital signal processor (DSP), which will be implemented in a hybrid power compensator of ±100 kVA power rating. The hybrid power compensator consists of a three-phase thyristor controlled reactive (TCR) source, combined with the three-phase 40 kVA voltage-fed system. The characteristics of the digital current controller for the DPF are introduced and described. Simulation results of this digital control technique on a single-phase DPF are shown and compared with practical results obtained from a low-power (±300 VA) single-phase DPF