A Review and Discussion of the Grid-Code Requirements for Renewable Energy Sources in Spain

During the last years, the rate of renewable energy sources in the current electricity production mix has been increasing more and more. In parallel, a significant development of regulations have been proposed by most developed countries, where the integration of these alternatives resources has been mainly focused on wind and PV power plants. Under this scenario, this paper discusses the current and upcoming Spanish grid code requirements concerning renewable energy resources. Specifically, the operating procedures P.O.12.2 and P.O.12.3 are described in detail. These procedures involve non-interrupted generation submitted to disturbances, extending characteristics such as low voltage ride through or reactive and active power capabilities. Additionally, the last draft proposed by the Spanish transmission system operator is included as well, comparing the current specifications facing other European requirements for renewable energy sources.