A Novel Three-Vectors-Based Predictive Direct Power Control of Doubly Fed Induction Generator for Wind Energy Applications

Direct power control (DPC) has been proven to be an effective approach for the control of doubly fed induction generators (DFIG). However, conventional switching-table-based DPC presents large power ripples at steady state and exhibits a broad harmonic spectrum, which is difficult to be filtered. Some SVM based DPC methods have been proposed to tackle the problems above, but they are usually complicated and sacrifice the robustness and simplicity. This paper presents a simple but effective predictive DPC to achieve quick response and good steady state performance. Meanwhile the simplicity and robustness of the basic DPC are maintained as much as possible. Three vectors are applied during one control period and their durations are obtained in a very simple and straightforward way. The novel PDPC is compared with prior art and the results prove that the novel PDPC achieves reduced control complexity, better steady state performance and quicker dynamic response at similar switching frequency.