The application of integral variable structure control in cutting-in control of double-fed induction generator

In order to achieve the target of no-load cutting-in smoothness and security of double-fed induction wind generator, a control strategy based on combination of integral variable structure control and field-oriented vector control is presented. So as to get a better dynamic performance and robustness in disturbance, the sliding model variable structure controller is used to control rotor current before cutting-in on the basis of establishment of wind turbine model with variable parameters. For the chattering of current, produced by variable structure control, the saturation function is employed to switch control and the integral transform is used to eliminate steady-state error, which can make the system produce quasi slide mode movement and reduce the distortion rate of controlled voltage. Finally, the proposed method is simulated with MATLAB/simulink and the results shows that the method can control the variable-parameters wind turbine model robustly.