Postgraduate Theses & Dissertations
Permanent URI for this collectionhttps://hdl.handle.net/20.500.14154/68006
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Item Restricted Enhancing the Performance of Self-Excited Wind-Driven Cage Induction Generator Through Changing the Number of Poles(Saudi Digital Library, 2020) Al-mithen, Ahmed Suliman; Abdel Halim, Mohammed Abdel Samieتعتبر المولدات الحثية من اكثر المولدات استعمالا" مع طاقة الرياح ، ومع النمو المتزايد لطاقة الرياح كان لابد من دراسة طرق التحكم بأداء المولدات الحثية المدارة بطاقة الرياح عند سرعات الرياح المختلفة للحصول على اكثر طاقة ممكنه منها ، لذلك في هذا البحث سيتم التحكم بأداء المولد عن طريق التحكم بعدد اقطاب العضو الثابت وسعة المكثف المربوط على التوازي مع الموالد بحيث يتم اختيار العدد المناسب من الأقطاب الذي يتوافق مع سرعات الرياح المختلفة وكمية السعة اللازمة من المكثف ليتم تحديد قيمة الجهد والتردد المناسبينThe renewable wind energy is encountering a globally rapid growth to become an important electricity source, which replaces the polluting and exhaustible fossil fuel. The induction generators are commonly used to transform the mechanical energy of the wind to electrical energy. Various techniques have been employed to extract the topmost energy from the wind streams. The present research aims at enhancing the performance of the self-excited wind driven cheap cage induction generators at the different wind speeds employing a control technique by altering the number of poles of the cage generator and adjusting the shunt capacitor. The control aims to maximize the input power captured from the wind, and to improve the generator electrical performance when the generator feeds static loads, and when supplies dynamic induction motor load. A complete mathematical model and computer simulation has been performed, and control protocols for the capacitor and poles have been reached which govern the generator speed such that the wind turbine blades revolve at speed, which is optimally proportional to the wind stream speed. Consequently, the highest mechanical power is taken from the wind. At the same time, the built-up voltage is adjusted around the load rated voltage for static loads. In case of dynamic induction motor loads, two control strategies have been suggested. The first is to keep the number of poles of the motor at the minimum number, while the number of poles of the generator are changed to comply with the wind speed. This is accompanied by changing the gear ratio to comply with the wind speed. The second is to change the number of poles of the motor when changing the generator number of poles. In both cases, the capacitor size required is clearly small as compared with fixing the generator number of poles.1 0