Abstract
This paper presents the design of a high-voltage hybrid generator (HG) and conversion system for wind turbine applications. The HG combines wound field (WF) and permanent magnet (PM) rotor excitations. At any given speed, the PM induces a fixed stator voltage, while the WF induces a variable controlled stator voltage. The HG alternating output is rectified via a passive rectification stage; hence, the machine net dc output voltage is controlled over a prescribed, but a limited range. The split ratio between PM and WF rotor sections is considered as varying from a fully WF rotor, or traditional synchronous generator, to some ratio of PM to WF excitation. The turbine operational characteristics and maximum wind velocity variations between turbines in a wind farm are used to define the WF to PM split ratio. Both a three-phase and a nine-phase stator winding design are investigated. The nine-phase winding results in 4.2% higher output RMS voltage that yields a more power dense solution. It further yields lower rectified dc-link voltage ripple. The HG mass, loss audits, and efficiency discussions are presented. In order to investigate the feasibility of the HG concept, a small scale laboratory prototype is designed, and operational test results presented that show good agreement with the simulation model results.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
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.