OPERATION OF PERMANENT MAGNET SYNCHRONOUS GENERATOR APPLIED TO THE GRID CONNECTED WIND TURBINES
Different types of generators such as direct current, induction, synchronous with electromagnetic excitation have wide application in wind power production. Recently, the application of permanent magnet synchronous generators, including megawatt power generators, became widespread. The use...
Збережено в:
| Дата: | 2022 |
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| Автори: | , , |
| Формат: | Стаття |
| Мова: | Ukrainian |
| Опубліковано: |
Institute of Renewable Energy National Academy of Sciences of Ukraine
2022
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| Теми: | |
| Онлайн доступ: | https://ve.org.ua/index.php/journal/article/view/335 |
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| Назва журналу: | Vidnovluvana energetika |
Репозитарії
Vidnovluvana energetika| Резюме: | Different types of generators such as direct current, induction, synchronous with electromagnetic excitation have wide application in wind power production. Recently, the application of permanent magnet synchronous generators, including megawatt power generators, became widespread.
The use of permanent magnets in the excitation system of generators makes it possible to eliminate excitation losses and sliding contacts, simplify the design, increase the efficiency and reliability of generators.
However, in such generators, in contrast to synchronous with electromagnetic excitation, there is no possibility to adjust the output parameters of the generator by changing its excitation. Therefore, the stabilization of the output parameters of the permanent magnet generators, especially when they work on the network, is an extremely important task. This problem requires solving the problems of adjusting the parameters of the generator using electronic circuits (inverters), considering the continuous change of wind speed, speed of the generator and the corresponding change of its parameters.
This paper deals with the parameters and conditions that must be met in parallel operation of the generator and the network, as well as the negative consequences of erroneous phasing of the generator and the network.
In the case of rotation of the generator rotor by the wind wheel, the angle Ѳ between the EMF of the generator and the network voltage changes continuously, in the process of which the electromagnetic power and the torque of the generator change too. If the rotor speed is higher than the synchronous speed, the angle Ѳ increases continuously and the machine alternately switches from generator mode to motor mode, and vice versa.
In motor mode, the electromagnetic moment changes its sign and acts on the rotor in the direction of its rotation, being motor. At an angle Ѳ> π / 2, the generator can fall out of sync, ie there is a complex transition process that determines the requirements for the electronic circuit connected between the generator and the network.The paper presents an option of this scheme, which consists of several blocks, and analyzes their relationship. As a result, it can conclude that it is possible to stabilize the output parameters of wind turbines with permanent magnet excitation in accordance with the requirements of the network. |
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