Research on harmonic suppression strategy of inverters in microgrids

Increasing use of power electronic components in inverter brings a lot of harmonics, which seriously affects the power quality of microgrid. An improved three-phase voltage source inverter is proposed according to the study of harmonic suppression control strategy of inverter. The second order generalized integrator can track current signal quickly and suppress signal noise. Therefore, a method uses the second order generalized integrator to synthesize virtual harmonic impedance is proposed. This method is applied in traditional double loop control to reduce harmonic content of inverter output voltage. In order to improve the control effect, the quasi-PR controller is used to replace traditional PI controller in voltage control loop. Finally, this paper builds a system model by Matlab/Simulink. The simulation results show that the proposed method can effectively reduce the harmonic voltage and improve the power quality.