Design of single-phase phase-locked loop based on cascaded second-order gener-alized integrator
Due to the inevitable existence of various DC bias and higher harmonics in the current power grid,the traditional phase-locked loop(PLL)based on Second-order Generalized Integrator(SOGI)is sensitive to DC bias and has insufficient filter-ing ability for higher harmonics.To solve this problem,a cascaded second-order generalized integrator structure is proposed,which consists of three cascaded SOGI modules.The first two SOGI modules filter out the higher harmonic and DC components respectively,and then output a pair of orthogonal components through the third SOGI module.Through MATLAB/Simulink mod-eling simulation and experimental platform verification,the results show that the cascaded SOGI-PLL proposed in this paper has good anti-DC bias interference ability and harmonic suppression effect,which has a good reference significance for the realiza-tion of single-phase system.
cascaded second-order generalized integratorphase-locked loopDC biasharmonic suppressiongrid connected control
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