Compensates the double tuned filter element parameter change based on the controllable reactor

A conventional passive filter consists of fixed capacitors and reactors, whose filtering performance cannot be satisfactory when the system frequency or component parameters change. Utilizing the controllable reactor in place of the fixed one is proposed to automatically trace the change of frequency and parameters. The influence of the parameters of series and parallel controllable reactor to the tuned filter is analyzed. It shows the feasibility to realize single and double tuned filter with self-tuned function by single controllable reactor. To reduce the cost of controllable tuned filter, this paper designed several new kinds of controllable tuned filters, at last, this paper simulates the filters by software, and the simulation result indicates that the new kind filter has good filtering effect.