Control of Dfig Wecs with Voltage Source Converters

This chapter deals with the MPC of power converters employed in doubly fed induction generator (DFIG) wind energy conversion systems (WECS). The generator‐side converter (GSC) is connected to the WFCP through a harmonic filter and a step‐up transformer. The power converter in a rotor circuit processes the slip power, which is approximately 30% of the rated generator power. The DFIG is popularly used in modern WTs because of its low converter cost, reduced power losses, and full controllability over active and reactive power. Digital control system development for the classical or predictive control of DFIG WECS requires a brief understanding of the block diagram of control scheme, control requirements, and calculation of reference control variables. The decoupling between the rotor‐side converter (RSC) and GSC enables the use of two independent digital control systems. The stator‐, rotor‐, and grid‐side feedback signals, as well as the DC‐link, are used by the RSC and GSC digital control systems. The stator currents are measured in the opposite direction to enable the use of motor models for generator operation.