In this paper

the selective harmonic compensation method for a kind of three-phase four-switch shunt active filter（TFSAPF for short）is proposed.The TFSAPF structure can reduce hardware cost of the system

but compare to the traditional three-phase inverter

the problem of insufficient capacity is easily occurred due to reduction of the number of power and electronic elements in the main circuit.Therefore

selective harmonic compensation strategy is adopted in this paper for selective compensation for the important sub-harmonic and the harmonic with low contents and ultra harmonic are abandoned.Firstly

the reference current is calculated by the use of selective harmonic detection algorithm and the reference value is tracked through three-phase four-switch voltage space vector pulse width modulation strategy（SVPWM for short）.Finally

the selective compensation for 6k±1 harmonics（i.e.

5

7

11

13

17 and 19）of the experimental system is performed and the effectiveness of the method is proved.