Analysis of grid codes and parameters identification for load frequency control

Recently, the complexity of the electric power systems has further increased as the national and regional power systems, instead of being small isolated systems, are now gradually being interconnected in a tendency towards a large interconnected electric power system at a continental level. The challenge is to adopt joint grid codes that are enforceable to all grids that are interconnected, to establish a framework for the cooperation between all entities that operate under the supervision of the organization responsible to ensure the secure and reliable operation of the bulk electric power system. The activity of the thesis is a performance investigation. The thesis is divided into 2 parts: The first part is related to analyzing the main operational rules adopted by large interconnected power systems. The second part concerns the analysis of the measurements made by field trials to evaluate the performance of the generating units and their compliance with the requirements stated in the operational rules, with particular focus on the frequency regulation. More details in the first part, it is required to perform a survey at international level of the main grid codes with the aim of highlighting common major differences emerged from the analysis of the networks and to identify an overview of the main implemented policies and the "common best practices" that are recommended to be adopted by a generic organization that is responsible for developing a plan for an electric power system ahead of time, its operation in real time, and evaluating its performance after the hour. The second part will instead refer to the evaluation of the behavior of the generating units and their compliance with the requirements of the operational rules. Usually the operator performs a number of measurement campaigns to be carried out on the generating units, in order to assess compliance with the operational requirements. One of the main requirements concerns the primary frequency regulation. The execution of the tests would require the need to be able to operate on the units by changing the set-point power, resulting in an interruption of the generation or the deviation from the production plans. The aim is to develop a methodology for conducting performance analysis of the Load Frequency Control, using measurements carried out in normal operating conditions that offers the advantage of not interfering with the production plans and verifying the methodology developed with actual measurements provided by CESI through the use of analysis tools of the measurement signals.