Three-phase drive UPS component test, system composition and realization

Xin Tang

Research output: ThesisMaster's Thesis

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Abstract

Electricity is used widely all over the world in modern industry activities. Accordingly, people's consideration for the quality of the electricity is stricter and stricter. In this case, people can use uninterrupted supplying, which can supply continually alternating-current main for electrical loading equipments while the electric network is abnormal (e.g. power cut, under voltage, perturbance or surging) and maintain the electrical equipment in normal operation. Supplying power uninterruptedly can be accomplished by two ways: Flywheel-type power and battery uninterrupted power. Owing to its power from gas engine, bringing out a lot of noise and immense size, Flywheel-type uninterrupted power is only used in emergency and some special natural conditions. Uninterrupted power is provided by storage battery under normal conditions. In metallurgy industry, the production process for obtaining high quality special steel includes melting and remelting procedures with certain cooling activities. Cooling is achieved by pumping water taken from a reservoir. Usually, the power required for these pumps comes from the grid. Cooling is essential at any time and for the very few line interruptions encountered-e.g once a year- a simple emergency supply based on a Diesel engine a three-phase generator was found unreliable at starting because of the very long times of standstill (12 months or more) between operation events. This paper comprises a basic scheme of the establishment of uninterrupted supplying power in general industrial system, among them some key segments, e.g. test for storage batteries, establishment of electrication system of storage battery and uninterrupted supply system for induction machine load. The test of storage battery mainly consists of discharge detection of storage batteries at constant power and constant current and safeguard of discharge circuits and so on. Beginning with the design of electrical circuits, we run a computer software simulation and nally realize circuits on circuits boards. The section of establishment of storage battery electrication system mainly consists of storage battery voltage balance segments and storage battery interconnection segments. The section of establishment of storage battery electrication system mainly consists of storage battery voltage balance segments and storage battery interconnection segments. The section of establishing the uninterrupted supplying power system, we discuss electricity grid, storage battery, connection of frequency converters and safeguard.
Original languageEnglish
QualificationDipl.-Ing.
Awarding Institution
  • Montanuniversität
Supervisors/Advisors
  • Weiß, Helmut, Supervisor (internal)
  • Ince, Kayhan, Co-Supervisor (internal)
Award date26 Jun 2009
Publication statusPublished - 2009

Bibliographical note

embargoed until null

Keywords

  • Uninterrupted power supply Battery Charging Discharging Amplifier Simulation Load overheating protection Timing system Low pass Filter Differential amplifier Converter Rectifier Inverter 6SE70 Emergency switch

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