Realistic loss modelling and minimisation in a permanent magnet generator for wind energy applications

A proper maximum power tracking algorithm for a wind energy conversion systems (WECS) requires all the relevant losses to be modelled, especially copper and core losses. Such accurate loss modelling is not a simple task when the machine operates connected to a power converter. The speaker has validated an equivalent circuit for a novel air-cored permanent-magnet (PM) generator by comparing the results from a transient non-linear finite-element model (FEM) of the generator and by experimental testing on a 20-kW prototype. Finally, the benefits of a proper integrated optimisation are presented in terms of annual energy yield and average losses. The speaker suggests that a detailed loss modelling is desirable at a design stage for an optimum matching between machine and rotor blades.