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Control methods of a stand-alone doubly fed induction generator mostly use either proportional-integral regulators in multiple synchronous reference frames or proportional-integral-resonant regulators in a stationary reference frame. These control schemes work well when the plant model is not complex and system decoupling is implemented into the control algorithm. However, when the control system...
The paper presents properties and control methods of grid-connected doubly-fed induction generator (DFIG). The paper is focused on unbalanced grid operation, because presently it is the biggest challenge for this type of generator. There are discussed three most popular methods - direct power control, direct torque control, and vector control with proportional-resonant PR controllers of rotor current...
The paper presents a state controller for torque and reactive power tracking of a doubly fed induction generator operating in an unbalanced grid. The state feedback gain is tuned using linear-quadratic optimization. Reference stator currents are calculated using instantaneous power theory and precisely tracked by the current controller. In the paper there are presented simulation results of an electrical...
Several methods can be used in the current control loop of a doubly-fed induction generator systems. The PI controllers in the rotating frame system oriented to the stator voltage (VOC) or flux (FOC) are the most popular control methods. In this case, controller response in each axis also gives an answer to the second axis. Therefore, a transient state of the system response is longer and may have...
The paper describes a variable speed, doubly fed induction generator based, standalone power system supplying unbalanced and nonlinear load. A sensorless control method of the fundamental 50Hz harmonic uses a PLL for synchronization of the measured stator voltage vector with the reference one. Additional part of control includes feedbacks from the components of voltage asymmetry and harmonics, extracted...
A paper describes cooperation of the standalone doubly fed induction generator with an energy storage or auxiliary power unit coupled with the DC bus of the main back-to-back power electronics converter. The control method and the energy management of the energy storage coupled through a bidirectional DC/DC converter with a DC-link of the main back-to-back converter is proposed. The control method...
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