Investment Deferral of Sub-Transmission SubstationUsing Optimal Planning of Wind Generators and Storage Systems
Spring 2017, Volume 1 - Number 1 علمی-پژوهشی (وزارت علوم) (12 صفحه - از 18 تا 29)
Electricity consumption increases continuously because of several reasons such as population growth.Due to consumption growth of electricity it is necessary to upgrade generation, transmission and distributionequipments. In distribution level, transformers of sub-transmission substations should be upgradedto overcome load growth. In this paper, it is recommended to use wind generators and storage devicesinstead of transformer upgrading of substations. This is significant because of environment pollutionand investment deferral of sub-transmission substations. Hence, this paper suggests a new method to determinethe optimal capacity of wind generators and energy storage system (ESS) for investment deferralof sub-transmission substations. In this method reliability and economic aspects are considered alongwith time varying loads. Furthermore, to peruse the uncertainty of wind generation an innovative pointestimate method (PEM) has been fulfilled. The main goal of the presented method is to minimize theinvestment cost of the ESS units and wind generators, purchased power from upstream network and alsoreliability maximization. The objective function is mathematically formulated as a mixed-integer nonlinear programming problem and subsequently solved by genetic algorithm (GA). The proposed method is successfully applied to a study case and obtained results show the efficiency and applicability of theproposed approach.
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