MODELLING OF LARGEPOWER SYSTEMS AND TUNING OFREGULATORS’ PARAMETERS

Abstract: Interconnection between France and Italy under the Alps could impact the European power system stability. Indeed, the HVDC lines are active elements of electrical grid that influence its dynamic behaviour in case of disturbances. Extensive studies must be run to precisely determine the specifications of this cross-border link and its conversion stations. These studies require models as precise as possible of the European network. The best available model at present for the synchronous network of continental Europe is the Dynamic Reference Model (DRM), which was compiled in the framework of the IPS/UPS study [6]. It modelled a winter situation (high peak load) and the first task of the Master Thesis consisted in the development of a summer situation (low load period) of this model. In this way, it would be possible to perform stability studies in both situations to obtain more precise and reliable results. The DRM models for winter summer situation were firstly designed to study small-signal stability and especially inter-area mode, i.e. electromechanical oscillations between two groups of machines. In the perspective of transient stability studies in the area of the future HVDC line between France and Italy, this model had to be updated. Detailed versions of regulators and transformers were therefore implemented in order to model more precisely the transient dynamic behaviour of French machines. An update of the dynamic data of the Italian power system had also to be performed with new detailed versions of regulators created. Furthermore, the European synchronous electric power system is becoming larger with interconnections of new countries, such as Turkey in 2011 and other ones in the future. Because of this on-going enlargement, new phenomena concerning inter-area modes might occur. In this new context, benchmarks had been created to develop and test a new methodology for tuning the regulators’ parameters of synchronous generators.