Predictive direct power control for three-phase grid-connectedrnconverters with online parameter identification

摘要

It is well known that predictive direct power control method can be influenced by the presence of modelingrnerrors. Any small variations in model parameters will degrade the performance and stability of the controlrnsystem. However, this value is difficult to be measured precisely in practical implementation. This paperrnproposes a predictive direct power control method for three-phase grid-connected converters with onlinernparameter identification technique. Specifically, the proposed method alleviates the parameter mismatchrnproblem by using the online parameter identification technique based on model reference adaptive systemrnestimation theory. The proposed strategy not only identifies the parameter accurately, but also improvesrndynamic response without any additional sensors. The excellent steady-state and dynamic performance ofrnthe proposed method are confirmed through extensive simulations. Copyright©2016 John Wiley&Sons, Ltd.