By Topic

Cycloconvertor-excited divided-winding doubly-fed machine as a wind-power convertor

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $31
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

2 Author(s)
Holmes, P.G. ; University of Leicester, Department of Electrical Engineering, Leicester, UK ; Elsonbaty, N.A.

The paper describes a slip-ring induction machine operating as a doubly-fed generator above and below synchronous speed. A prime mover simulates a wind turbine by producing a torque increasing in proportion to the square of the speed. This torque is balanced in steady-state operation by the doubly-fed generator. The stator, or secondary of the generator is arranged in two electrically separate, magnetically coupled layers connected to a cycloconvertor operating with continuous circulating current. This reduces the harmonics injected into the supply and prevents line-to-line short circuits under shock conditions. The secondary frequency is locked to the difference between actual speed and synchronous speed. A deadband is built into the frequency demand loop to ensure steady-state synchronous rather than asynchronous performance of the generator. Control of the secondary voltage amplitude enables the system to generate power proportional to the cube of the speed over a wide speed range. Three alternative methods of secondary control are considered. These are: (i) secondary current modification, (ii) a voltage-speed function and (iii) constant secondary current feed. The efficiences and peak power capabilities of the methods of systems (ii) and (iii) are contrasted in operation as a quasi-wind-energy transducerss.

Published in:

Electric Power Applications, IEE Proceedings B  (Volume:131 ,  Issue: 2 )