Optimized design method of C-type damped filter for AC passive filters in converter station

Passive filters have been widely used because of their mature technology and low cost, among which second-order high-pass filters and C-type damped filters are widely used in the management of harmonic problems in new power systems. However, the current passive filter design in the converter station is to filter out the characteristic harmonics, ignoring the influence of low-order harmonics, so that the system is always affected by harmonic resonance. In view of the fact that the design theory of the existing second-order high-pass filter and C-type damped filter is not clear, and the design parameters of the filter circuit have a large optimization space, the optimization design process is analyzed in detail considering the filtering effect and harmonic amplification effect combined with the circuit principle, so as to improve the filtering effect and economy of the second-order high-pass filter and the C-type damped filter.