Control of a Small Wind Turbine in the High Wind Speed Region

ABSTRACT:

This paper proposes another delicate slowing down control methodology for network associated little wind turbines working in the high and high wind speed conditions. The proposed strategy is driven by the evaluated flow/torque points of confinement of the electrical machine as well as the power converter, rather than the appraised intensity of the associated load, which is the restricting variable in different techniques. The created technique furthermore manages the issue of framework startup keeping the generator from quickening to a wild working point under a high wind speed circumstance. This is practiced utilizing just voltage and current sensors, not being required direct estimations of the breeze speed nor the generator speed. The proposed strategy is connected to a little wind turbine framework comprising of a perpetual magnet synchronous generator and a basic power converter topology. Reproduction and test results are incorporated to exhibit the execution of the proposed technique. The paper additionally demonstrates the impediments of utilizing the stator back-emf to gauge the rotor speed in changeless magnet synchronous generators associated with a rectifier, because of noteworthy d-pivot current at high load.

 

 CIRCUIT DIAGRAM:

Fig. 1. Schematic representation of the wind energy generation system: a) Wind turbine, generator and power converter; b) Block diagram of the boost converter control system; c) Block diagram of the H-bridge converter control system.

EXPECTED SIMULATION RESULTS:

 

Fig. 2. Simulation result showing the behavior of the proposed method under increasing wind conditions (10 m/s, 17 m/s from 10 s, and 33 m/s from 13s): a) rectifier voltage command (v_ r ), rectifier voltage (vr) and minimum rectifier voltage command (v_ r min); b) boost current (ib), filtered boost current (~i b), current limit (ilimit) and MPPT current target (imppt); c) turbine torque (Tt) and generator torque (Tg); d) mechanical rotor speed (!rm).

 Fig. 3. Simulation result showing the behavior of the proposed method under decreasing wind conditions (30 m/s, 21 m/s from 4.5 s, and 8.5 m/s from 7s): a) rectifier voltage command (v_ r ), rectifier voltage (vr) and minimum rectifier voltage command (v_ r min); b) boost current (ib), filtered boost current (~I b), current limit (ilimit) and MPPT current target (imppt); c) turbine torque (Tt) and generator torque (Tg); d) mechanical rotor speed (!rm).

Fig. 4. Experimental results showing the behavior of the propose method under increasing wind conditions (10 m/s, 17 m/s from 10 s, and 33 m/s from 13 s): a) rectifier voltage command (v_ r ), rectifier voltage (vr) and minimum rectifier voltage command (vr min); b) boost current (ib), filtered boost current (~I b), current limit (ilimit) and MPPT current target (imppt); c) mechanical rotor speed (!rm).

 Fig. 5. Experimental results showing the behavior of the propose method under decreasing wind conditions (30 m/s, 21 m/s from 4.5 s, and 8.5 m/s from 9 s): a) rectifier voltage command (v_ r ), rectifier voltage (vr) and minimum rectifier voltage command (vr min); b) boost current (ib),filtered boost current (~I b), current limit (ilimit) and MPPT current target (imppt); c) mechanical rotor speed (!rm).

CONCLUSION:

The activity of little wind turbines for local or private venture use is driven by two variables: cost and practically unsupervised task. Extraordinarily essential is the turbine activity and insurance under high wind speeds, where the turbine torque can surpass the appraised torque of the generator. This paper proposes a delicate slow down strategy to diminish the turbine torque if a high wind speed emerges and, as a special element, the technique can early distinguish a high wind condition at startup keeping the turbine/generator running at low rotor speed maintaining a strategic distance from progressive begin and stop cycles. The proposed strategy utilizes just voltage and current sensors commonly found in little turbines making it a reasonable arrangement. Both reenactment and trial results show the legitimacy of the proposed ideas. This paper additionally demonstrates that generally utilized machine and rectifier models accepting solidarity control factor don’t give precise estimations of the generator speed in stacked conditions, regardless of whether the resistive and inductive voltage drop are decoupled, because of the noteworthy flow of d-pivot current if a PMSG is utilized. This paper proposes utilizing a pre-dispatched look-into table whose inputs are both the rectifier yield voltage and the lift current.

 

Leave a Reply

Your email address will not be published. Required fields are marked *