A phase-locked loop control method for single-phase grid-connected microgrid based on repetitive control
A technology of repeated control and control method, applied in the field of microgrid, can solve the problems of affecting the phase-locking accuracy, limiting the speed of the phase-locking loop, unable to accurately capture the zero-crossing point, etc., to enhance robustness, suppress periodic interference, improve Effects of phase-lock delay and poor dynamic performance
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[0031] according to figure 1 And this embodiment is described in detail as follows.
[0032] This embodiment includes the following steps:
[0033] Step 1 First, collect the single-phase grid voltage signal through the transformer , ,in is an unknown quantity;
[0034] Step 2 adopts the second-order generalized integrator method to establish an orthogonal coordinate system, and the single-phase grid voltage signal Two quadrature voltage components are obtained by the second-order generalized integrator with , whose expression is
[0035] ;
[0036] ;
[0037] obtained by sampling The single-phase input is constructed into two-phase quadrature components by means of second-order generalized integral. According to the transfer function of the second-order generalized integrator, the two orthogonal components are obtained as
[0038] ,
[0039] ;
[0040] The two quadrature voltage components that will be constructed with As an input, it is introd...
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