Design and Realization of a Variable-Winding Generator for Ocean Power Systems

• Main Authors: Chi-Lu Li, 李奇錄
• Other Authors: Min-Fu Hsieh
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/13923792775877339330

碩士 === 國立成功大學 === 系統及船舶機電工程學系碩博士班 === 96 === Taiwan, as an island, is surrounded by ocean and seas. In the sea area of the Pacific Ocean near Taiwan, the steady Kuroshio Current, carrying massive energy, flows toward north. In the west sea area, there are also a few sites that have strong currents. These areas are suitable for constructing renewable energy power systems that can effectively convert ocean or tidal current energy to electricity. This would provide great help in solving the more and more severe energy crisis. However, the flow rate of the currents is not always steady, and a regulable or controllable power conversion system should be considered to achieve high conversion rate when absorbing ocean energy. Therefore, the functions of maximum power tracking, steady voltage output or power, etc., can be accomplished. Permanent-magnet (PM) generators have the advantages of high efficiency, reliability and power density. Due to the permanent magnets used, the characteristics of PM generators, such as the speed - induced voltage relationship is fixed. For peak power tracking, a speed controller is often applied to achieve the function. This thesis focuses on the characteristic regulation of permanent-magnet generators with winding changeover design to replace the speed controller. The turbine characteristic and a simple resistive load are considered to work with the designed regulable PM generator. Via experiments, the designed generator is capable of achieving the function of maximum power tracking, steady voltage output and steady power output.