Active filter control method for inhibiting low-frequency inter-harmonics and flicker

The invention provides an active filter control method for suppressing low-frequency inter-harmonics and flicker, which comprises the following steps of: firstly, analyzing a quantitative conversion relation between the low-frequency inter-harmonics and voltage fluctuation, determining suppression interval frequency of the inter-harmonics, and designing a low-pass filter by taking upper limit frequency of the interval as cut-off frequency; detecting a reactive component and an inter-harmonic component of the current signal to be compensated through an instantaneous reactive power method based on an ip-iq method; processing the inter-harmonic component by using a low-pass filter to generate a target current of an inter-harmonic compensation link of the active filter; a target voltage of a dynamic reactive compensation link of the active filter is obtained through PI control, and a target voltage of an inter-harmonic compensation link is obtained through quasi-proportional resonance control; and finally, superp