A considerable number of communities throughout the
world, most of them isolated, need hybrid energy solutions either for rural
electrification or for the reduction of diesel use. Despite several research
projects and demonstrations which have been conducted in recent years,
wind-diesel technology remains complex and much too costly. Induction
generators are the most robust and common for wind energy systems but this
option is a serious challenge for electrical regulation. When a wind turbine
is used in an off-grid configuration, either continuously or intermittently,
precise and robust regulation is difficult to attain. The voltage parameter
regulation option, as was experienced at several remote sites (on islands
and in the arctic for example), is a safe, reliable and relatively simple
technology, but does not optimize the wave quality and creates
instabilities. These difficulties are due to the fact that no theory is
available to describe the system, due to the inverse nature of the problem.
In order to address and solve the problem of the unstable operation of this
wind turbine generator, an innovative approach is described, based on a
different induction generator single phase equivalent circuit.