Abstract
The study aims at the speed control of the wind turbine driven Permanent Magnet Synchronous Generator (PMSG) by sensor-less Field Oriented Control (FOC) method. Two methods of sensor-less FOC are proposed to control the speed and torque of the PMSG. The PMSG and the full-scale converter have an increasing market share in variable speed Wind Energy Conversion System (WECS). When compared to the Induction Generators (IGs), the PMSGs are smaller, easier to control and more efficient. In addition, the PMSG can operate at variable speeds, so that the maximum power can be extracted even at low or medium wind speeds. Wind turbines generally employ speed sensors or shaft position encoders to determine the speed and the position of the rotor. In order to reduce the cost, maintenance and complexity concerned with the sensor, the sensor-less approach has been developed. This study presents the sensor-less control techniques using the flux-linkage and the back EMF estimation methods. Simulations for both the methods are carried out in MATLAB/SIMULINK. The simulated waveforms of the reference speed, the measured speed, the reference torque, the measured torque and rotor position are shown for both the methods.
Highlights
Variable-speed wind generation with the Permanent Magnet Synchronous Generator (PMSG) and a full-scale power electronic converter is a promising but not yet a very popular wind turbine concept
The PMSG is modelled in the d-q reference frame with the d-axis aligned with the permanent magnet axis
The PMSG is controlled with a sensor-less field oriented control for varying reference speeds and torques
Summary
Variable-speed wind generation with the PMSG and a full-scale power electronic converter is a promising but not yet a very popular wind turbine concept. A PMSG connected to a power electronic converter can operate at low speeds, so a gearbox is not required. The efficiency of a PMSG based wind energy system is higher than other variable-speed WECS. The generator-side converter controls the generator speed to enhance the wind power extraction. A rotor field oriented control is applied to the generator-side converter to control the generator speed and to obtain the maximum electromagnetic torque with the minimum current. When compared to the direct control, vector control achieves higher overall system efficiency, which is mainly due to the lower current distortion and the consequent lower joule losses (Freire et al, 2012)
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Research Journal of Applied Sciences, Engineering and Technology
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
