Power Electronics Converters and Their Control for Renewable Energy Applications by unknow

Author:unknow
Language: eng
Format: epub
Publisher: Elsevier Science & Technology
Published: 2023-07-15T00:00:00+00:00

8.4.2 Centralized control

In the centralized control method, a central control unit is used. This central unit collects all data related to DG units, storage units, and loads and makes various decisions to control the system parameters. One of the important features of the microgrid is optimizing the exchanged power through central control. In this way, the local production is maximized depending on market prices and security restrictions. The information exchange, between the controllable loads and the distributed energy resources units in the microgrid, is provided by a two-way communication. However, in this control method, there is a time delay in the information due to measurement and communication in the control loop, which is an important limitation depending on its size. Gathering all the necessary information about the microgrid in a central point facilitates the operation and control of the system. By collecting these data, different parameters of the microgrid such as the renewable energy generation, the battery charge status, the grid electricity prices, the controllable load information, the energy management of the microgrid, and the power exchange with the grid can be controlled from a single center. However, since microgrid control signals may need to be sent in a few millisecond periods, a high-quality and reliable communication infrastructure is needed to ensure all these. The reliability of the system is another important point that should be considered. If a malfunction occurs in the central controller, the stability of the entire system is affected. This turns out as the major disadvantage of this control approach. An example of the centralized control is shown in Fig. 8.15.

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