Abstract
A novel control strategy based on the optimization of transfer trajectory at operation points for DFIG is proposed. Aim of this control strategy is to reduce the mechanical fatigue of DFIG caused by the frequent adjustment of rotating speed and pitch angle when operating in the islanded power system. Firstly, the stability of DFIG at different operation points is analyzed. Then an optimization model of transfer trajectory at operation points is established, with the minimum synthetic adjustment amount of rotating speed and pitch angle as the objective function and with the balance of active power and the stability of operation points as the constraint conditions. Secondly, the wind speed estimator is designed, and the control strategy of pitch system is improved to cooperate with the indirect stator flux orientation control technology for rotor-side inverter control. Then by the coordination control of its rotating speed and pitch angle, an operation trajectory controller is established to ensure the islanded operation of DFIG along the optimal transfer trajectory. Finally, the simulation results show that the proposed control strategy is technical feasibility with good performance.
Highlights
The islanded operation is a significant operation mode of wind turbine, and this can widen the applied range of wind turbine [1]
This paper presents a novel control strategy to enable the doubly fed induction generator based wind turbine (DFIG) to operate in the islanded mode
(1) The control strategy enables DFIG to control the frequency and amplitude of the stator voltage independently which is similar to a voltage source, and it is not needed to equip a large power source to sustain the voltage of islanded power system
Summary
The islanded operation is a significant operation mode of wind turbine, and this can widen the applied range of wind turbine [1]. A control strategy based on the optimization of transfer trajectory at operation points for a standalone DFIG is proposed. Through applying this control strategy to coordinately regulate the rotating speed and pitch angle, the DFIG can autonomously operate along the transfer trajectory with the minimum synthetic adjustment amount of rotating speed and pitch angle. It mainly contains the wind speed estimator, the control unit of rotor-side converter and variable pitch system, and the operation trajectory controller.
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