Maximum Power Extraction from Utility-Interfaced Wind Turbines

摘要: Wind energy is one of the most promising renewable resources for producing electricity due to its cost competitiveness compared other conventional types resources. It takes a particular place be suitable production. isn't harmful environment and it an abundant resource available in nature. Hence, wind power could utilized by mechanically converting electrical using turbine, WT. Various WT concepts have quick development technologies significant growth capacity during last two decades. Variable speed operation direct drive WTs been modern developments technology conversion system, WECS. Variable-speed has many advantages over fixed-speed generation such as increased capture, at MPPT wide range speeds, high quality, reduced mechanical stresses, aerodynamic noise improved system reliability, can provide (10-15) % higher output less stresses comparison with fixed [1, 2]. classified according type train into (DD) gear (GD). The GD uses box, squirrel cage induction generator (SCIG) stall, active stall pitch control work constant applications. variable doubly-fed generator, (DFIG) especially WTs. gearless DD used small medium size employing permanent-magnet synchronous (PMSG) numbers poles eliminate need gearbox which translated efficiency. PMSG appears more attractive, because permanent magnet, (PM) machines electrically excited efficiency, yield, no additional supply magnet field excitation reliability absence components slip