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Parallel Operation of Three-phase Self-excited Induction Generators Driven by Renewable Energy Sources

Squirrel-cage induction machines, because of their low prices and rare demand for maintenance, can work as self-excited induction generators (SEIGs) in remote areas to convert wind or pico-hydro power to electricity, enhancing the use of different forms of renewable energy. However, with the increase of load, a single SEIG may not provide enough capacity to meet the demand, so parallel operation of several SEIGs is often required, necessitating a technique to analyze the characteristics of this kind of operation. This paper presents steady-state analysis of two SEIGs based on the equivalent circuit of the induction generator. The two-machine model allows the performance and load sharing features to be evaluated when the two generators undergo different rotating speeds.