COMPARISON OF PARAMETERS OF ASYNCHRONOUS AND SYNCHRONOUS ELECTRIC GENERATORS WITH PERMANENT MAGNETS EXCITATION FOR WIND TURBINES

• Дата: 2021
• Автори: Permynov, Y., Marchenko, N., Permynova, S.
• Формат: Стаття
• Мова: Ukrainian
• Опубліковано: Institute of Renewable Energy National Academy of Sciences of Ukraine 2021
• Теми: wind turbine; permanent magnets synchronous generator; permanent magnets.; вітроустановка; синхронний генератор зі збудженням від постійних магнітів; постійні магніти.
• Онлайн доступ: https://ve.org.ua/index.php/journal/article/view/301
• Назва журналу: Vidnovluvana energetika

The article compares the main parameters of wind turbines whith various designes based on the characteristics of some wind zones in Ukraine [1] and the wind speed used in their design in Ukraine and in the world. For this purpose, according to a certain algorithm [2–7], a number of synchronous generators with a power of 600 to 3600 kW were evaluated with a reference to the capacity of machines produced by Large Electric Machines Plant LLC (Kakhovka, Ukraine). The construction of the machines produced by this plant after their conversion from asynchronous motors to synchronous generators with permanent magnet excitation is shown. The prospects of using permanent magnets in excitation systems of synchronous generators are determined. It is noted that according to this approach to the synchronous wind turbines design, the mandatory use of multipliers is required to ensure the rotation frequency corresponding to the rotation frequency of the converted induction motors. The second condition is the compliance of the induction in the working gap not lower than 0.7 – 0.8 T. This requires the use of high energy density magnets, such as the NdFeB.  This type of magnets also allows to simplify the design, eliminate the excitation losses that are inherent in generators with electromagnetic excitation and to increase the generators efficiency and reliability. The use of multipliers requires their mandatory service and reduces the generating set reliability. In this regard, the original design of a gearless permanent magnet generator was considered. The design feature of this generator is the absence of the stator yoke and multiplier, as well as the generator housing. The generator housing is a laminated stator package and, in general, the generator is a part of the wind turbine head, thus, its weight can be reduced significantly. The article substantiates the expediency of using a caseless modular design of a wind turbine with excitation from permanent magnets without a multiplier and compares wind turbines parameters with the mentioned design. Ref. 9, table 4, fig. 3.