Abstract
Renewable energies has shown to be a promising solution to improve the energy injected to the electrical network. However, the lack of inertia in such systems have proven to affect the grid stability, as those technologies operate as current controlled sources they not provide grid support functionalities. This issue has fostered the implementation of new control strategies to enable power plants to provide a coordinated action to support some inertia and damping into the system. Synchronous controllers have proven to be an excellent option for distributed renewable generation, which allows to emulate the inertia of a synchronous generators, having a better interaction between the power converter and the electrical grid. However, the implementation of such control strategies require power converter to be smarter and include advanced control algorithms. In this paper, a new control strategy to control different distributed generation units to have a coordinated action in front of the electrical grid is presented, reducing the cost of the power converter by extracting the synchronous control from the internal controller and replacing in by a central synchronous controller.
Highlights
During the last decade, grid integration of renewable energies has been increasing significantly, mainly due to reduction of the cost associated to PV and wind power
The difference between the voltage measured at the point of common coupling (PCC) of the power converter, ݒ, is subtracted from a virtual voltage representing the electromotive force of the synchronous generator, ݁௩
In this paper the synchronous control for distributed generation units has been presented. This controller is able to provide synchronous power references different power converters within its control system and share between units the power reference to provide a unique performance at the PCC
Summary
Grid integration of renewable energies has been increasing significantly, mainly due to reduction of the cost associated to PV and wind power This scenario implies the appearance of other drawbacks, as the overall inertia decrease in electrical networks with a high share of these technologies. The synchronous power control is able to work either in the grid connected and islanded operation mode [7] This control concept has many implementations, the main goal behind all of them is the same, the inertia emulation and its improved response during grid transients. This work proposes a synchronous control capable of performing with most traditional power controllers inside the power converter, to provide a joint action at the PCC of the system
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