The application and optimization of C-type filter in a combined harmonic power filter

A new construction of hybrid power filters, which needs lower capacity of active component comparing with existing hybrid power filter, is proposed. In order to decrease the rating of active filter, a C-type filter is adopted which is in series with the active filter, for its high impedance at the fundamental frequency while presenting a low impedance at the harmonic frequencies. The most active power filters existed require a large power rating, while this configuration can reduce large rating of active power filter as the C-type filter carries most of the fundamental voltage. In order to be satisfied the criterion of the harmonics compensation and run in an economic way, a parameters optimization of C-type filter is put forwarded. The simulation is made in this paper, which is with the optimized parameters. It is confirmed by analysis and simulation that the combined power filter with optimized C-type filter runs in an effective and economic way in the harmonic compensation.