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

fYear

1989

fDate

1-5 Oct. 1989

Firstpage

711

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Industry Applications Society Annual Meeting, 1989., Conference Record of the 1989 IEEE

Conference_Location

San Diego, CA, USA

Type

conf

DOI

10.1109/IAS.1989.96727

Filename

96727