Abstract


The purpose of the present thesis, motivated by the technical and economic challenges that produce the aleatory massive introduction of Distributed Generation the electric power system is to study and to contribute to the knowledge of the impact of this technology in the security, reliability and quality on the high voltage distribution electric power system. The operative structure of these distribution systems has been designed to receive power in high voltage (HV) and give it to the consumers in low voltage (LV), based on an economy, reliability, security and quality supply objectives. In this structure, the generation is instantly adjusted in agreement with the demand. The DG introduction in the high voltage distribution system has an important impact in the power flows and in the voltage levels in the consumers, giving place to important technical problems that should be considered when we carry out these connections. Therefore it is important to consider that in the aleatory introduction of DG in the HV distribution systems, besides the economic benefit it should make sure the reliability, security and quality supply in the system, which should carry out the technical restrictions of the operative approaches. Since in a competitive market exist different DG owners and also in some of them their primary energy source is variable, as in case of the eolic or solar energy, it doesn't exist guarantee that the mentioned operative approaches are fulfilled. 
So that, the present thesis objective has been the development of models that allow to determine in all instant the electric power production of different distributed generation plants (eolic parks and cogeneration plants) and using them, to evaluate in different scenarios the impact that supposes the aleatory massive introduction of DG in the HV distribution system, on one hand, with regard to the system operation: 
	·	Losses in the grid 
	·	Power flows 
	·	Voltage variations 
	·	Contribution to the failure level of the system 
And on the other hand, with regard to the power transfer capacity in the HV distribution system, which will be an indicator of the maximum power that in each scenario it is possible to transfer from one area to another area of the system without committing the security levels. 
In this thesis, have been developed two models of electric power production in DG, having in consideration if the primary power source is variable or no, the eolic parks in the first case and the cogeneration plants in the second. Using these models, integrated in the HV electric power distribution system it has been evaluated in different scenarios the impact that has the aleatory massive introduction of DG in the electric system operation.