Design of a wind turbine generator for rural applications

Abstract

This paper presents a wind-generation system design for rural applications. In Southern areas of Argentina, there are right conditions for wind energy exploitation. Depending on the characteristics of these areas, the wind-generation systems can operate either isolated or connected to the grid. This work particularly emphasises the design of a generator to optimise the system performance and achieve its minimum volume. The analytical design is evaluated using finite element analysis and experimentally validated using a 35 kW prototype. The tests reveal that the design procedure is suitable. The initially proposed efficiency aim was exceeded, reaching a maximum value of 94.2%. The generator operating conditions make it particularly suited for the application for which it was designed.

Torque Production Limit of Surface Permanent Magnet Synchronous Machines and Their Electromagnetic Scalability

“…The relative error between FEA (using M270-35 A) and the upper bound starts around 20 % and gradually decreases to 10 % as the power rating gets higher. Knowing that these machines are generated from JMAG-Express and not optimized, The ones from [22], [23], and [24] used fractional slot windings and the one from [25] has an external-rotor topology.…”

“…Depending on the optimization strategy, the discrepancy (between measured and the upper bound) due to relaxation can be as small as 5.8% in [24]. It is worth noting that the two smaller machines used fractional slot windings [22]- [24] the biggest one employed an external-rotor topology [25], indicating that the presented upper bound applies not only to regular multiphase windings, whose MMF can be explicitly described by (1), and the internal-rotor topology, where r is > r or > r m shall hold.…”