Abstract
In reliability studies of isolated energy supply systems for residential buildings, supply failures due to insufficient generation are generally analysed. Recent studies conclude that this kind of analysis makes it possible to optimally design the sizes of the elements of the generation system. However, in isolated communities or rural areas, it is common to find groups of dwellings in which micro-renewable sources, such as photovoltaic (PV) systems, can be installed. In this situation, the generation and storage of several houses can be considered as an interconnected system forming a cooperative microgrid (CoMG). This work analyses the benefits that sharing two autonomous installations can bring to each one, from the point of view of reliability. The method consists of the application of a random sequential Monte Carlo (SMC) simulation to the CoMG to evaluate the impact of a simple cooperative strategy on the reliability of the set. The study considers random failures in the generation systems. The results show that the reliability of the system increases when cooperation is allowed. Additionally, at the design stage, this allows more cost-effective solutions than single sizing with a similar level of reliability.
Highlights
The increase in energy demand and dependence on fossil fuels [1] has boosted the integration of renewable energies [2]
The great disadvantage of this type of system is the reliability of supply, since a profitable design usually implies a large number of hours per year of energy not supplied (ENS), increasing indices such as the loss of load probability (LOLP) to inappropriate levels [11]
The parameterized analysis of the results shows the potential to improve the design considering the cooperative management of the MG, which allows the minimization of costs, the minimization of the size and usage of support systems and a significant improvement in the reliability of the system as a whole
Summary
The increase in energy demand and dependence on fossil fuels [1] has boosted the integration of renewable energies [2]. Small size DERs in Spain are usually implemented through the so-called stand-alone photovoltaic (SAPV) energy systems [5,6,7], which generally include batteries to store energy and supply night demand. These types of systems are currently very attractive in rural areas thanks to the new regulations that have regulated self-consumption since 2019 [8]. Due to the high price of ESSs, especially those based on renewable energies, an optimized design of the generation system is of vital importance In this sense, there are studies that focus on improving the performance of these systems [12,13,14]. Other works are focused on improving the management of generation, demand and storage resources to obtain maximum reliability with the lowest possible cost [15,16]
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