A model-free predictive control strategy based on fuzzy current observation is proposed to address the problem that parameter mismatch can lead to bus voltage deviation when applying model predictive control algorithms to a dual active bridge DC-DC converter (DAB) in a DC microgrid. Firstly
the periodicity of sinusoidal function is used to design a sliding mode observer with multiple stable points for fuzzy observation of output current
which effectively improves the response speed of the observer. Then
the observed value of the sliding mode observer is substituted for the current value in the predictive model of the converter
and it is found through parameter sensitivity analysis that the proposed method can eliminate the steady state error caused by the parameter mismatch of the predictive control model. Finally
a system simulation model and a prototype platform are built to verify the effectiveness of the proposed method.
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references
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