A no-load grid-connected strategy based on one-cycle control for doubly-fed wind power system

By analyzing the operation behavior of variable speed constant frequency (VSCF) wind-power system with double-fed generator, the no-load mathematics model of the DFIG is built based on the stator flux oriented vector control. Two one-cycle control (OCC) controllers are designed to the back-to-back dual-PWM converters. Taking the grid voltage and output DC voltage as the command signals of OCC controller in grid-side-converter, the output AC voltage of vector controller as the command signal of OCC controller in rotor-side-converter, the rotor excitation current and the stator voltage are controlled. Experimental results indicate that no-load grid-connected wind power system based on the designed OCC controllers can realize the regulation of the stator output voltage even if electrical machinery torque is changed.