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The DSWIG scheme proposed in this paper uses an inverter with apparent power lower than the corresponding generator power. The expected ratio between the inverter power and the generator power is 50% in the case of DSWIG. This is similar to DFIG applications. The advantage of DSWIG is the lack of brushes. DSWIG can be used in variable speed applications. It is possible to extract low power even at low speeds, which cannot be obtained when the generator is directly connected to the grid, or when the generator has an inverter on the excitation winding and a diode bridge on the main winding. The DSWIG typology is an advantageous solution when it supplies unpretentious loads. The inverter on the main winding is used to transfer active power and also reactive power required for generator magnetization at low speeds, when the capacitor could not provide enough reactive power. Digital simulations and experimental results, in good correspondence, prove the validity of the theoretical considerations.
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