The design and research of generator wave filter based on the APF and zig-zag transformers

In this paper, the APF and zig-zag transformers technology are applied to the design of generator wave filter, article focus on APF harmonic detection method, which is based on p-q algorithm. At the same time, According to zero sequence of harmonic problems of power transmission and distribution system, zig-zag transformers technology is adopted to suppress harmonic zero sequence, this paper also further analysis the effect of zig-zag transformers technology to the filter. The function of APF filter not only depends on harmonic detection ability, but also relates to voltage DC side APF closely. So this paper also studies the control method of capacitor voltage of APF side based on fuzzy PID.