An Induction Generator System Using Fuzzy Modeling and Recurrent Fuzzy Neural Network

A frequency controlled three-phase induction generator (IG) system using ac-dc power converter is developed in this study. The electric frequency of the IG is controlled using the indirect field-oriented control mechanism. Moreover, an ac-dc power converter is adopted to convert the electric power generated by a three-phase IG from variable-frequency and variable-voltage to constant dc voltage. The rotor speed of the IG, the dc-link voltage and current of the power converter are detected simultaneously to yield maximum power output of the IG through dc-link power control. In this study, first, the indirect field-oriented mechanism is designed for the control of the IG. Then, a novel fuzzy modeling is developed to determine the flux control current and the maximum output power of the IG according to the rotor speed and the desired terminal voltage of the IG. Moreover, an online training recurrent fuzzy neural network (RFNN) with backpropagation algorithm is introduced as the tracking controller of dc-link power. Furthermore, some experimental results are provided to show the effectiveness of the proposed IG system using the RFNN controller for the dc-link power control. Finally, the control performance of the dc-link voltage control using the RFNN is also discussed by some experimental results