Student: I can't figure out how to do that, since I can't seem to cut off more than two of the four corners. Mentor: Don't worry, what I asked you to do is actually impossible! There are only six faces on a cube, so the highest number of sides possible is six. Student: That makes sense. I bet you can do that with any prism-it's just a matter of angling the cross section correctly to intersect all of the faces. Mentor: You're very right, any prism can be cut in such a way that the cross section has as many sides as the prism has faces. However, not all shapes have this same property.
Recently, a new technology i.e. variable frequency transformer (VFT) has emerged as a flexible ac link to transfer power in-between asynchronous power grids. Hence, this paper aims to explore the possibility of grid integration of PMSG based WTG using VFT.
They are a type of voltage. controller. Variable speed drives ensure gradual. acceleration and deceleration and enable speed. to be matched precisely to operating conditions. Controlled rectifier type variable speed drives are. used to supply power to DC motors and. frequency inverters are used for AC motors. Historically, drives for DC motors appeared first. Reliable and cost-effective frequency inverters. appeared as a result of advances in power. electronics and microelectronics. Modern. frequency inverters can be used to supply power. to standard asynchronous motors with. performance levels similar to those of the best. DC variable speed drives.