Abstract: A dynamic harmonic filter for an AC power system comprising at least one voltage source and at least one load is provided. The harmonic filter comprises a current sensing or voltage injection transformer connected in series with the voltage source and the load. One end of the primary of the transformer is connected to the voltage source, and the other end is connected to the load. The harmonic filter further comprises a parallel resonant LC circuit tuned to the fundamental frequency of the power system. One end of the secondary (S2) of the current injection of the voltage sensing transformer is connected to one junction of the parallel resonant LC circuit and the other end of the secondary of the current injection or voltage sensing transformer is connected to the other junction of the parallel resonant LC circuit through the secondary (S1) of the current sensing or voltage injection transformer.

Abstract: A dynamic harmonic filter for an AC power system comprising at least one voltage source (V) and at least one load. The harmonic filter comprises a current sensing or voltage injection transformer (T1) connected in series with the voltage source and the load with one end of the primary (P1) of the current sensing or voltage injection transformer connected to the voltage source and the other end of the primary of the current sensing or voltage injection transformer connected to the load. The harmonic filter further comprises a parallel resonant LC circuit (L1C1) tuned to the fundamental frequency of the power system. One end of the secondary (S2) of the current injection of the voltage sensing transformer is connected to one junction of the parallel resonant LC circuit and the other end of the secondary of the current injection or voltage sensing transformer is connected to the other junction of the parallel resonant LC circuit through the secondary (S1) of the current sensing or voltage injection transformer.