A Novel Sliding Mode Control of Doubly-fed Induction Generator for Optimal Power Extraction

Aiming at overcoming the complexity of the doubly- fed induction (DFIG) generator in traditional vector control, a novel sliding mode control (SMC) strategy is proposed to apply to the direct power control (DPC) of DFIG in this paper. To track maximum power point quickly and weaken the chatter of the sliding mode control, the sliding mode controllers using a novel approach law are designed in the rotor side converter (RSC). Both active power and reactive power are directly controlled by DFIG rotor sides voltages and voltage space vector pulse width modulation (SVPWM) technology is used to make the switch frequency remain stable. The stability of the system is proved by theoretical analysis, and a simulation presents that the controllers designed have an excellent performance of accuracy and robustness.