**8. The solving of the problem of an accumulation with using the concept of DFIA**

Wind power plants must be highly reliable. This is due to the fact that the generator is located at high altitude, works in different climatic zones, and it is very difficult to carry out repair work in these conditions.

This requirement makes the supply of electricity to the rotor without sliding contact.

In the proposed generator, a second built-in electric machine is used to solve this problem.

presented. The concept is confirmed by the complex engineering calculations and

*Application of an Asynchronous Synchronous Alternator for Wind Power Plant of Low, Medium…*

This concept can be used for design of windmill row with output power up

the manufacturing of the prototypes.

*DOI: http://dx.doi.org/10.5772/intechopen.89255*

to 1 MW.

**Author details**

**27**

Sergey Gandzha\* and Anton Kotov

provided the original work is properly cited.

South Ural State University, Chelyabinsk, Russia

\*Address all correspondence to: gandja\_sa@mail.ru

© 2019 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium,

**Figure 32.** *DFIA design with built-in rechargeable batteries.*

But it is possible to apply another technical solution. Batteries can be used to power the electrical circuits of the rotor if placed on a rotating part (**Figure 32**). In this case, the exiting alternator can be excluded. The battery pack will additionally function as a storage device [4].

In practice it is impossible to use windmills without energy storage devices. It is necessary for us to have a stable energy supply but wind has unstable action.

Nowadays the storage batteries are the acceptable energy storage devices taking in consideration the reliability and cost. The double-fed alternator allows combining two concepts (creating the standard energy and storage energy) at one device. In sketch, it is possible to see that the rotor has enough place for allocation the batteries (**Figure 32**).

These batteries can solve two problems. They are:

