碩士 / 義守大學 / 電機工程學系碩士班 / 98 / Ship-to-shore container cranes are not only the major equipment of shipment of ocean transportation but also their processes are important to reduce freight time. Container cranes use inverters to control large AC/DC motors to achieve various actions of loading or unloading containers. However large inverters and large AC/DC motors have non-linear load characteristics, those characteristics will produce large amounts of harmonic currents when the equipment works. The harmonic currents produced will propagate through power systems, affect other electrical equipment, make the voltage waveform distorted and influence the wharf power quality. Besides, the movements of ship-to-shore crane have stochastic characteristics; the stochastic characteristics must be considered in the harmonic analysis. This thesis investigates the behaviors of stochastic harmonic sources caused by container cranes and their penetrations to power supply systems. In order to analyze the stochastic behaviors of container cranes in detail, the movements of container crane are divided into ten stages. A power quality recorder is used to record the voltage, current, power, harmonic etc. of each stage. The time distribution of each stage can also be investigated accordingly. Base on the measured data and time distribution of each stage, a comprehensive analysis can be achieved. Test results demonstrate the significance of the proposed method.
| Identifer | oai:union.ndltd.org:TW/098ISU05442028 |
| Date | January 2010 |
| Creators | Jun-Yi Lin, 林峻毅 |
| Contributors | Jen-Hao Teng, 鄧人豪 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 76 |
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