| 摘要 |
An active front-end rectifier filter latency compensation method based on model predictive control. The method is characterized in that comprised are the 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 &bgr;, and input current sampling values, i fα and i f&bgr;, under a two-phase stationary coordinate system; establishing an equivalent mathematical model rectifier on the basis of an actual voltage balancing equation (1) in an rectifier, and establishing an equivalent filter model on the basis of an actual transfer function corresponding to the filter, thus constituting a filter latency observer; and, compensating the difference value between the input current sampling values, i fα and i f&bgr;, and equivalent sampling currents, i ofα and i of&bgr;, into an input of the filter latency observer via a proportional controller. In comparison to the input current sampling values, i fα and i f&bgr;, the input current observed values, i fα and i f&bgr;, of the rectifier are not impacted by a filter latency and are closer to the actual input current value of the rectifier, as such, the impact of the filter latency is compensated. |
