The purpose of this master thesis is extension of the indices for assessing the efficiency of the investments in electrical power systems. This thesis is based on two major objectives: to investigate the technical impact of the new investment and yield the correlation between the technical impacts caused by the new investment and the overall investment cost (technical impact per monetary unit). Therefore, the principal goal is to assess investments efficiency based on the new introduced indices which based on the considered technical impact (real power losses, reactive power losses, apparent power losses and voltage profile improvement) are appointed as RPI (real power losses index), QPI (reactive power losses index), API (apparent power losses magnitude index) and VPI (voltage profile improvement index). In order to achieve the objectives and to reach the goal, new improved method is proposed for assessing the efficiency of the investments in electric power system.
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