Tese de mestrado. Engenharia Eletrotécnica e de Computadores (Área de especialização em Sistemas de Energia). 2006. Faculdade de Engenharia. Universidade do Port

Brown, Paul David

English

This thesis considers the case of a small island system that has abundant renewable energy available but that at times cannot accept all of this power because of limits imposed by security criteria and dif-ficulty in regulating frequency. The question of integrating pumped storage in an isolated network like this is considered from two directions. First, the problems with frequency regulation that can occur when large amounts of renewable energy resources are included are addressed. Pumped storage is considered as an option to alleviate these problems and allow larger integration of renewable resources without compromising system security. A modification to the security criteria generally used is developed and tested. The second part of the work is an economic analysis of the inclusion of pumped storage. The question of whether or how much pumped storage to include is addressed by formulating a linear programming problem. The stochastic nature of load and renewable production in an isolated system is addressed using scenarios developed through fuzzy clustering. Both the unit capacity in MW and the reservoir storage capacity in MWh are optimized, and optimal operating strategies for the scenarios are produced. Results showed that including pumped storage can be an effective means of allowing larger penetra-tion of intermittent renewable energy sources, improving both the dynamic security and the economic operation of a test system. Including the dynamic security criteria in the economic question of dimen-sioning the pumped storage unit proved to make a significant difference in the optimal pumped storage capacity. 

Evaluation of integration of pumped storage units in an isolated network

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