Improved Active Power Filter Performance for Renewable Power Generation Systems

摘要

An active power filter implemented with a four-leg voltage-source inverter using a predictive control scheme is presented. Traditionally, active power filters have been controlled using pretuned controllers, such as PI-type or adaptive, for the current as well as for the dc-voltage loops. PI controllers must be designed based on the equivalent linear model, while predictive controllers use the nonlinear model, which is closer to real operating conditions. An accurate model obtained using predictive controllers improves the performance of the active power filter, especially during transient operating conditions, because it can quickly follow the current-reference signal while maintaining a constant dc-voltage. Although active power filters implemented with three-phase four-leg voltage-source inverters are presented in this paper. The use of a four-leg voltagesource inverter allows the compensation of current harmonic components, as well as unbalanced current generated by single-phase.....