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Self-excited wound type induction generator excited with capacitor, changing its speed as wind generator and being used for a separetely small power source, is researched.The voltage and frequency of this generator change in accordance with capacity C of capacitor, generator speed and loads etc.The constant voltage generator with constant C is achieved by means of returning the secondary power of the induction generator to the primary source through a converter, an inverter and a transformer and controlling the inverter control angle. But the frequency changes slightly.In order to disappear frequency variation under constant C, a constant frequency source such as a synchronous generator or a constant frequency generator is connected to the primary or the secondary side of the transformer and parallel operation of them is made. And so constant voltage and constant frequency are achieved in spite of the change of generator speed and load. Characteristics by means of these various connections are compared.The constant frequency generator is better than the synchronous generator concerning life and maintenance etc. In the parallel operation with the constant frequency generator connected to the primary or the secondary of the transformer, various characteristics at constant voltage and commercial frequency are compared and researched.

Investigation of Characteristics of Self-Excited Induction Generator at Constant Voltage and Constant Frequency under Speed Change.