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Direct drive wind turbine generators with superconducting excitation winding are studied with focus on the electromagnetic damper design. A semi‐analytical eddy current model is built for parametric design studies based on a vector potential approach. The considered generators employ open stator slots and exhibit strong saturation effects, so that an analytical expression for the source terms is not...
The type of electroactive polymer known as dielectric elastomers has shown considerable promise for harvesting energy from environmental sources such as ocean waves, wind, water currents, human motion, etc. The high energy density and conversion efficiency of dielectric elastomers can allow for very simple and robust “DIRECT DRIVE” generators. Various types of energy harvesting generators based on...
Upscaling of wind turbines affects the individual components in the wind turbine. In order to assess the effects of upscaling on the direct drive generator used in wind turbines, the weight and size of the generator sub-components should be estimated. A method to estimate the weight is either by designing the generator analytically, or by using finite element method or by building the machine. These...
This paper presents a modern configuration of the power chain for a high power wind turbine machine using permanent magnet generator. A test setup is shown and device specifications are described. Advantages of using direct drive generators are also shown. The discussion on the use of SRG is proposed. It provides a low speed solution of the wind turbine power converter design.
This paper looks into a new concept for reducing the structural weight of large direct drive generators used in wind turbines. The concept uses magnetic bearings to position the rotor of the machine. The weight of the rotor using the new concept is compared to a rotor designed with conventional methods. The comparison of a 5 MW generator rotor structural material shows about 45% reduction of weight...
This paper presents dynamic modeling and simulation of a grid connected variable speed wind turbine (VSWT) using PSCAD/EMTDC, a widely used power system transient analysis tool. The variable speed wind system with a direct-drive generator and power electronics interface is modeled for dynamic analysis. Component models and equations are addressed and their implementations into PSCAD/EMTDC are described...
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