Document Type : Original Article
Authors
1
PhD student, Department of Electrical Engineering, Faculty of Engineering, Khomein Branch, Islamic Azad University, Khomein, Iran.
2
Assistant Professor, Department of Electrical Engineering, Faculty of Engineering, Khomein Branch, Islamic Azad University, Khomein, Iran.
3
Assistant Professor, Department of Electrical and Computer Engineering Golpayegan College of Engineering Isfahan University of Technology Golpayegan, Iran
Abstract
In this paper, nonlinear characteristics, parameter uncertainty and network disturbances in DFIG-WTs may affect the dynamic performance and energy conversion efficiency. Therefore, the goals of this research can be achieved by reducing overall system losses and system disturbances. ADRC is a simple and robust control technique that can deal with internal and external system disturbances. Moreover, ADRC is not strongly dependent on the exact mathematical model of the system.
Magnetic inductance has the highest value compared to other DFIG parameters. Also, its value changes during grid disturbances due to saturation of the main flux. Therefore, incorrectly setting its value in the controller can lead to a significant distortion in performance. Therefore, a new control strategy based on MA-NADRC, considering the LM, is proposed to regulate the rotor current.
The LM technique is based on the analytical derivation of the optimal reference value of the DFIG reactive current to achieve the minimum total loss. MA-NADRC is based on introducing rotor model information to the auxiliary part of the model, and the change of magnetic inductance is also considered in the proposed MA-NADRC. As a result, more power can be delivered to the network and increase the ability to attenuate disturbances. In addition, a new tuning approach is proposed to evaluate MA-NADRC parameters.
Keywords
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