Kyo-Beum Lee, Myong-Ho Woo, Joong-Ho Song, and Ick Choy, “Single-Phase Active Filter for High-order Harmonics Compensation,” in Proc. EPE Conf., CD format, pp. 1–10, 2001. > Paper

A single-phase active power filter for high-order harmonic current compensation is presented in this paper. In modern railway

locomotives, multi-paralleled PWM converters provide unity power factor operation with low THD, but their high-order harmonics

current may provoke interference problems to the railway tack signal and public telecommunication lines. A hybrid digital filter is

proposed to extract the harmonics reference currents compensated in active filters. A prediction algorithm to compensate the delay

problem that appears in the deadbeat current control is also proposed to produce a predicted harmonics reference current. The

effectiveness of the proposed algorithms are verified through simulations and experiments.