Modeling and Control Strategy of Active Tuned Hybrid Power Filter

In this paper, the circuit configuration of Active Tuned Hybrid Power Filter (ATHPF) applied to high-voltage grid is presented and the operation principle of ATHPF is analyzed theoretically by deducing its electrical model. A new detecting method of filter detuning based on the difference of harmonic voltage across the inductor and the capacity of PPF is proposed to overcome the shortcomings of the original based on the subtraction of harmonic phase. The ATHPF simulation model conducted in PSIM is established and the simulation results show that the proposed detuning method satisfies the requirement of ATHPF control system, and verify that the ATHPF enables simultaneously to suppress the specific harmonic and eliminate multiple dominant harmonics without affecting passive filter filtering effects at all other frequencies.