Title :
Development of a new uninterruptible power supply using flywheel energy storage techniques
Author :
Tokahashi, I. ; Itoh, Youichi ; Andoh, Itaru
Author_Institution :
Dept. of Electr. & Electron. Syst. Eng., Nagaoka Univ. of Technol., Japan
Abstract :
An uninterruptible power supply (UPS) with a flywheel for an energy storage unit is described. An electrical main circuit consisting of a half-bridge converter, a symmetrical half-bridge inverter, and an inverter/converter is used to drive the flywheel induction motor/generator. Charging or discharging control of the mechanical energy is achieved by controlling the slip frequency of the induction machine. The converter is controlled by a current follow-up method using a hysteresis comparator to get the sinusoidal input current and the unity power factor. The inverter is controlled to obtain the sinusoidal voltage by using a voltage follow-up method. Experimental results are given.<>
Keywords :
asynchronous machines; energy storage devices; invertors; power convertors; uninterruptible power supplies; UPS; current follow-up method; flywheel energy storage; half-bridge converter; hysteresis comparator; induction machines; machine control; mechanical energy; power convertors; power factor; slip frequency; symmetrical half-bridge inverter; uninterruptible power supply; voltage follow-up method; Circuits; Energy storage; Flywheels; Frequency; Induction generators; Induction machines; Induction motors; Inverters; Mechanical energy; Uninterruptible power systems;
Conference_Titel :
Industry Applications Society Annual Meeting, 1989., Conference Record of the 1989 IEEE
Conference_Location :
San Diego, CA, USA
DOI :
10.1109/IAS.1989.96727
