The objective in this project is to control the networks of production of electric energy using electronic systems, proposal of an architecture based on FPGA card
There are a lot of different architectures and designs. I recommend reading some related articles. You should note that the best design will depend on your application. Here are some articles. I hope they can help.
http://ieeexplore.ieee.org/document/6921803/
http://ieeexplore.ieee.org/document/4058926/
Conference Paper GSM-based remote sensing and control system using FPGA
While it is basically possible to implement control systems on FPGAs (whether on the nowadays nealy ubiquitous controllers embedded within the FPGA or on the "logic fabric"), I cannot see the need to do so. At least not in the fabric.
The reasoning is quite simple: as "the grid" is 50 (60) Hz, there is no need for overly fast algorithms (more the contrary). Thus the use of FPGAs might be considered "overkill" - adding complexity to the control units to no avail. But this is my personal opinion.
On the other hand: if a lot of (communications) peripherals is required for some "control node", the use of an FPGA might make sense to add the necessary number of communications channels via the use of the fabric.