The Power Decoupling Control for Wind Power Converter Based on a Novel Speed Sensor-Less

Doubly fed induction generators based wind turbines are today one of the most widely used generation systems in wind farms. The stator is directly connected to the constant frequency three phase grid and the rotor currents are appropriately controlled to vary the slip power thereby enabling variable-speed constant-frequency operation. Instead of using encoder for rotor position estimation, a novel digital PLL method based on analog traditional PLL and model reference adaptive system is firstly presented and implemented in this paper. The converter of DFIG with power decoupling control and speed sensor-less is designed. Simulation results illustrate that the presented method (digital PLL) can well measure the rotor speed and position and the power decoupling control of converter based on the rotor speed and position from speed sensor-less is realized excellently.