Abstract：Due to the wide control bandwidth of the shunt active power filter（SAPF），the resonance problem

of the LCL output filter has become a key problem of the SAPF. To solve the resonance problem of the LCL filter，a

novel damping method based on active damping circuit was proposed to achieve the damping effect without

affecting the SAPF control. The proposed method was based on an auxiliary converter connected in series with the

capacitor branch of LCL filter. In the auxiliary converter，the resonant current was detected and injected inversely as

the reference signal of the converter，to achieve the damping effect on the resonant current. The stability of the

proposed method was carried out through the frequency response analysis，and compared with the traditional

method，which proved the theoretical feasibility of the proposed method. Finally，the effectiveness of the proposed

method was verified by the experimental results，and it has better switching harmonic suppression effect compared

with the traditional passive damping method.

      Key words：shunt active power filter （SAPF）；LCL filter；active damping circuit；harmonics compensation