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Abstract

An active front-end rectifier filter delay compensation method based on model predictive control is disclosed. The method includes following steps: detecting a three-phase grid voltage and three-phase input current sampling value of an active front-end rectifier, and transforming both via Clarke transformation to acquire grid voltage sampling values e_α and e_β, and input current sampling values i_fα and i_fβ under a two-phase stationary coordinate system; establishing an equivalent mathematical model of rectifier on the basis of voltage balancing equation (1) in an actual rectifier, and establishing an equivalent filter model on the basis of a transfer function corresponding to the actual filter, thus constituting a filter delay observer; and, compensating the difference value between the input current sampling values i_fα and i_fβ, and equivalent current sampling values i_ofα and i_ofβ into an input of the filter delay observer via a proportional controller. In comparison to the input current sampling values i_fα and i_fβ, the input current observed values i_oα and i_oβ of the rectifier are not impacted by a filter latency and are closer to the actual input current value of the rectifier such that the impact of the filter delay is compensated.

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