Fast Frequency Support by Wind Farms Using Frequency Deviation Parameter and Rotor Torque Limit of Doubly Fed Induction Generator

Seyed Abdolrahman Ahmadnezhad ¹ ( Department of Electrical Engineering- Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran )
Ramtin Sadeghi ² ( Department of Electrical Engineering- Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran )
Bahador Fani ³ ( Department of Electrical Engineering- Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran )

Submited date : 2023-06-11 Accepted date : 2023-09-23

Keywords: Wind turbine, Frequency control, Doubly Fed Induction Generator, Temporary frequency support, second frequency dip,

Abstract :

Considering the penetration of renewable energy sources and wind turbines in power systems, the importance of these sources in maintaining and helping to control the frequency to increase the rare frequency level will be very meaningful and necessary. This paper proposes a design for supporting the system frequency and eliminating the second drop in frequency as well as restoring the speed of the wind rotor turbine based on the double-fed induction generator (DFIG). In this design, as soon as the disturbance detected, the power reference increased intelligently and as a function of the two parameters of the system frequency, changes and the wind turbine rotor speed based on the torque limit. Then, through these two parameters, to force the rotor speed to converge to a stable operating range, the power reference reduced until the electrical power is less than the mechanical power in a gentle slope and not a step, and finally leads to a quick recovery of the rotor speed. Another advantage of proposed scheme is that the characteristic properties of MPPT maintained throughout the frequency support, which helps to better improve the frequency of the system in case of changes in wind speed. The proposed scheme simulated based on the test system in MATLAB software. The simulation results show that the proposed scheme is able to improve the system frequency without causing a second dip and restore the rotor speed well and quickly.

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