Friends, today in this article we will learn about direct driven vertical axis wind turbines. I am going to give you information about all this in a very good way. So let’s start.
Direct driven vertical axis wind turbine (permanent magnetism synchronous generator)
The use of wind energy is growing worldwide and there are many different types of power systems available to convert wind energy into electrical power for electricity generation. A direct driven permanent magnet synchronous generator is shown here. This generator is specifically designed to be directly driven by a vertical axis wind turbine and placed at ground level. One of the many advantages of using a VAWT is that it is omnidirectional, i.e. it can accept wind from any direction and does not require a deflection mechanism. The current vertical axis turbine is a straight-bladed Darrieus turbine.
A directly driven generator avoids the losses, maintenance and higher costs associated with a gearbox. However, direct drive produces a larger generator than a generator connected through a gearbox. For a vertical axis wind turbine where the generator can be placed at ground level, size and light weight are concerns. Therefore the design can be optimized with efficiency and cost in mind rather than focusing on minimizing the weight of the generator. Thus, the vertical orientation of the axis can make generator design a common practice, free from weight and size constraints.
The permanent magnet synchronous generator is unique in several ways. It is a permanent magnet generator made with many poles and a large diameter. It is cable coiled, which means that the stator consists of circular cables. It has a relatively high voltage. The generator is designed for low rotational speed because it is directly connected to a vertical axis wind turbine. The generator also has an unusually high overload capability to enable electrical control and braking of the turbine. In addition, its reactance is low to meet design requirements. Electromagnetic simulation of the generator is performed using electromagnetic models.
Two important features of this type of generator are high efficiency over the entire operating regime and the desired overload capacity. These aspects are therefore investigated more thoroughly in simulations taking into account the wind turbine aerodynamic behavior. The generator installed in 2010 is a 200 kW VAWT built in Falkenberg, Sweden.
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