Sliding-mode control of doubly-fed generator for optimum power curve tracking

Aiming to achieve superior tracking of a predefined optimum power curve, a simple standard sliding-mode controller (SMC) for the rotor-side converter feeding a doubly-fed induction generator (DFIG) is synthesised. Besides being robust against DFIG parameter variations, it is implementable on FPGA, and does not require PWM or SVM modulation. Results of real-time hardware-in-the-loop evaluation, obtained when running the proposed SMC together with an MRAS observer for sensorless control, are reported.