Different Control Strategies on the Rotor Side Converter in DFIG-based Wind Turbines

This paper applied different control strategies on the rotor side converter (RSC) of a 2 MW doubly fed induction generator (DFIG) wind turbine. Usually, the wind turbine is operated on the maximum power point tracking (MPPT) mode to obtain its maximum efficiency. Flux oriented control (FOC), voltage oriented control (VOC), direct torque control (DTC) and direct power control (DPC) are the most common control strategies on the RSC. These control methods play important roles in tracking the MPPT operating mode. The simulation of various control methods on the MPPT is necessary, and the performance of each control method needs to be evaluated, which can provide a reference to engineers and operators of a wind farm. The range of wind speeds in this simulation is from 3.5 m/s (cut in) to 25 m/s (cut out). In this study, the grid side converter (GSC) of the wind turbine utilized voltage oriented control (VOC) to maintain a constant DC voltage on the DC capacitor bus, and the reactive power is set to 0. All of the simulations were implemented by PSCAD/EMTDC software.