Optimal location and operation of energy storage devices in microgrids in presence of distributed generation
DOI:
https://doi.org/10.33131/24222208.290Keywords:
Energy storage, Economic dispatch, Power flow, Distribuited generation, microgrids, linear integer programmingAbstract
In this paper, an efficient methodology for the location and optimal operation of power storage in micro-grids through a mixed integer linear programming model (MILPM) is proposed. The developed mathematical model corresponds to an economic dispatch model for micro-grid with presence of distributed generation from renewable energy resources. Minimization costs of energy purchase in the energy exchange by the independent system operator, taking into account two operating scenarios, is considered as objective function: First scenario considers a fixed energy price and the second, variable prices at the node that connects the MG to the power system for a 24-hour operating horizon. The power flow by the branches, the PS capacities and the hourly capacities of power generation in the DG are considered as constraints. The CPLEX solver of optimization package GAMS is used to solve the proposed MILPM. The proposed methodology allows to locate, sizing and operate the PS, considering a typical labor day in Colombia as a horizon of operation, besides taking into account different operational schemes of the PS according to the existing standards. To know the state variables of the MG, a backward/forward sweep method is used to evaluate the responses obtained by the LIMPM. This evaluation allows to find the actual operational costs of MG. To validate the proposed mathematical model, a 7-nodes test feeder with two distributed generators is used, being one of photovoltaic type and the other wind type. The results obtained show the efficiency of the proposed methodology, as well as its ease of implementation and the adaptability for larger systems.
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