Principle and simulation of the self-tuning passive filter

This paper presents a new self-tuning passive filter which uses the thyristor controlled reactor (TCR) as a variable reactor. The equivalent inductance of the variable reactor is automatically changed by adjusting the thyristor´s triggering angle to make the filter always keep at the resonance state along with the deviation of the inductance and capacitance, and the filter can finish the self-tuning process. The theoretical analysis and simulation of this filter are given. The simulation results show that this new self-tuning passive filter is suitable for harmonics mitigation for most of power electronic equipments.