A Novel Method for Optimal Location and Expansion of Subtransmission Substations Considering Existing Medium-Voltage Distribution Feeders

Abstract

This research presents an accurate comprehensive cost function for the problem of optimal location of subtransmission substations. Technical constraints and economical parameters are investigated in the modeling. Genetic algorithm is used to optimize the cost function. Coding of decision variables is done in a way that finding the correct solutions is achieved faster. For the first time in this study, free capacity of medium voltage distribution feeders is used for optimal location of subtransmission substations. Also cost of coupling to upward grid in candidate substations with considering different levels of subtransmission voltage is presented. Efficiency of the proposed algorithm is evaluated via several case studies

Power substation location selection using fuzzy analytic hierarchy process and PROMETHEE: A case study from Bangladesh

“…Initially a literature review was conducted to identify various criteria and sub-criteria considered by location researchers and DMs [1,2,5,8,10,19,21,22]. Fourteen specialists from engineering, medical and academic background with Bachelor degree and average work experiences of 13 years in this field were chosen to form the decision team.…”

“…Distribution and substation systems are one of the most extensive parts of an electrical system and main point of losses of electric energy [1,2]. Therefore, significant economic gains can be obtained by optimizing networks that minimize immediate costs (facility installation costs) and further costs (related to energy losses and system maintenance) [3].…”

“…Sepasian et al [8] also proposed GA for longterm transmission substation expansion planning (SEP). Farrokhifar et al [2] developed a comprehensive cost function for the problem of optimal location of sub-transmission substations considering technical constraints and economical parameters. GA is used to optimize the cost function.…”

Optimal operation of energy storage devices with RESs to improve efficiency of distribution grids; technical and economical assessment

“…Therefore, the distribution system benefits from a variety of mathematical models developed for system illustrations in order to analyze and solve the optimization problems of the system. Among the above mentioned models, one may refer to optimal placement and development of distribution substations, optimal sizing of distribution transformers, optimal transferring of loads between substations and load centers, and optimal sizing of feeders for the given quantity of loads, all have some constraints [1]. Long-term planning for distribution grids development aims to determine the optimal scheduling in such a way that the total cost is minimized, while all constraints and technical requirements are met.…”

“…In addition to the estimation of the load growth, the type of the classification of the components must minimize the investment cost and power loss. Also, they should meet the planned objectives [1].…”