PSCAD modeling and simulation method for grid-connected inverter during unsymmetrical failure of power grid
A simulation method and technology for converters, applied in the directions of instruments, electrical components, circuit devices, etc., can solve problems such as affecting the normal operation of the converter, secondary ripple, and damaging the converter.
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[0045] Such as Figure 1 to Figure 11 As shown, the PSCAD modeling and simulation method of the grid-connected converter when the grid is asymmetrically faulted includes the following steps:
[0046] First, the three-phase voltage and current on the AC side of the grid-connected converter are phase shifted to separate the positive and negative sequence voltages and currents;
[0047] Transform the positive sequence and negative sequence voltage and current to the αβ axis through the Clark transformation, lock the phase of the positive and negative sequence voltage through the three-phase phase-locked loop, and then transform the voltage and current of the αβ axis to the dq rotating coordinate axis through the park transformation;
[0048] According to the control target of limiting the DC side bus voltage ripple, combined with the requirements of the unit power operation of the converter, the reference values of the positive and negative sequence current dq axes are obtained...
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