Optimal Control of a Variable Speed Wind （最优控制的变速风）.pdf

Optimal Control of a Variable Speed Wind Turbine under Dynamic Wind Conditions A. McIver, D.G. Holmes, P. Freere Department of Electrical and Computer Systems Engineering Monash University Wellington Road, Clayton, 3 168 Australia Abstract--Variable speed wind turbine systems have the common is either a back-to-back AC-DC-AC inverter system potential for significantly increasing the energy that is extracted (Figure. l), or a slip recovery system/doubly wound stator from the wind compared to constant speed turbines, since they machine system for higher power applications [2,3,4]. Both allow the rotor to continue to operate with maximum efficiency solutions are more expensive than a simple fixed speed as the wind speed varies. However, such systems require back- induction generator, and it is important for a practical wind to-back inverters, or specially wound motors, to achieve the variable frequency to constant frequency conversion that is generation system to be confident that the gain in recovered required. Since this adds to the cost and complexity of the energy under variable speed operation exceeds the additional system, it is desirable to make sure that the nett energy gain cost of the power electronics and/or machine modifications. outweighs the increased cost. Much of the work reported to date has concentrated on This paper explores this issue, by presenting