Matlab Simulation of DTC-SVM of Doubly Fed Induction Generator for Wind Energy System

Model predictive control of a doubly fed induction generator

“…This is accomplished by firstly approximating the rotor flux and electromagnetic torque, comparing it to the reference values, and then applying an appropriate voltage to the rotor in order to reduce the difference between the actual and reference values. Conventional DTC is implemented in two methods; via the use of hysteresis controllers and a switching table (DTC-ST) or via the use of pi controllers and space vector pulse width modulation (DTC-SVPWM) [28], [87], [88], [89], [90]. The switching table method is simple but has various disadvantages…”

“…However, this method is more complex than the switching table method as it requires the tuning of proportional-integral controllers. This method is similar to FOC [89], [90]. Direct power control (DPC) is a control method which directly control the stator active and reactive powers.…”

“…The output of the proportional-integral controllers produces the reference rotor voltage to be applied to the rotor of the DFIG [89], [90]. To preserve grid synchronisation, this reference rotor voltage is then transformed using the slip angle and passed through a modulator, which produce the switching signals for the converter [27].…”

“…However, due to the use of proportionalintegral controllers, the complexity increases, and the control method becomes generator specific. Furthermore, due to the requirement of the slip angle, accurate rotor angle knowledge is required [90].…”

Multilevel Converter and Fuzzy Logic Solutions for Improving Direct Control Accuracy of DFIG-based Wind Energy System

“…In addition, the regulation of the GSC currents using hysteresis controllers, which impose a variable switching frequency and considerable ripples. On the other hand, several approaches for improving RSC performances have been proposed [17,18]. Ayyarao [17] propose the enhancing of torque and flux performances by using sliding mode control (SMC).…”