Development of a doubly-fed generator for load leveling of a magnetic-flux deviation of a proton synchrotron

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A flywheel energy storage system based on a doubly-fed induction generator basically consists of a wound-rotor induction machine and a voltage-source PWM rectifier/inverter used as an ac exciter.This research focused on a doubly-fed induction generator intended for load leveling of a magnetic power supply for the next-generation proton synchrotron. A digital controller for the generator, developed in this research, is characterized by the combination of vector control and decoupling control. The controller enables the generator to perform active power control independent of reactive power control even in transient states. An experimental system rated at 7.5 kW was designed and constructed by combination of power electronics and motor drive technologies. The validity of the theory developed in this paper, along with the effectiveness and viability of the control strategy, is confirmed by the experimental system. The experimental system consists of a 7.5-kVA doubly-fed induction generator with a vertical axis.In addition, this research discusses a transient behavior of a magnetizing current in the induction machine, and proposed a new control method for suppressing a magnetic-flux deviation that may occur in the doubly-fed induction generator. The viability and effectiveness of the proposed method is verified by experiments using the 7.5-kW prototype developed in this research.