Design of a switching table for direct power control of a DFIG using sliding mode theory

This paper presents a synthesis of a switching table by means of sliding mode theory for a direct power control (DPC) of electrical systems. It is applied to the control of a variable speed wind system based on a doubly fed induction generator (DFIG). Control of active and reactive stator power exchanged with the grid is achieved by delivering to rotor side converter (RsC) references voltage rotor. These voltages are selected from the switching table. The developed control algorithm is implemented on an FPGA target device and tested on a 4 kW DFIG laboratory set-up. Simulation and experimental results show the effectiveness of the synthesized switching table.