Abstract
Multi-energy microgrids could result in more flexibility and increase reliability by interconnecting networks. Electricity and gas networks exhibit very different dynamic behaviours in response to a fault or failure. Gas networks have built-in energy storages that can continue to provide a reliable supply if gas inputs to the system are compromised. This study presents a novel reliability assessment method applied to multi-energy microgrids; the method combines an incidence matrix analysis that identifies the connectivity between sources and load points with a sequential Monte Carlo simulation and generation adequacy evaluation. A case study is conducted by using an electricity-gas microgrid. The electricity network is a multi-sourced grid, whereas the gas network is supplied by a biogas plant. The linepack (gas stored along the pipelines) is modelled to account for the slower gas dynamics. The proposed method is evaluated on a real-world electricity distribution network in Austria. The results indicate the reliability benefits of forming a multi-energy microgrid.
Highlights
Energy networks are being transformed into flexible, intelligent, and interconnected systems. Most of these changes are due to the advances in technology [1, 2], changes in energy policy, and economic factors, which have enabled the deployment of distributed energy resources (DERs)
Considering electricity-gas microgrids, especially in rural areas, where the connection with the wider gas network is nonexistent, or poorly maintained, and most of the gas is supplied by a local generation unit, the linepack has a stronger influence over the reliability assessment and should be modelled
The method is carries out the analysis across two different strands: firstly based on probabilistic method (Monte-Carlo) and further analysis of the connectivity between loading points and sources under unscheduled outages; and a second strand based on a generation adequacy, which assess the ability of the generation to match the load demands to which it is connected
Summary
Energy networks are being transformed into flexible, intelligent, and interconnected systems. Integration between electric and gas grids could play a crucial role [6] in accommodating the demand growth while meeting climate-change targets This aspect is vital in distribution systems, which are increasingly becoming more active, and the expansion of DERs paves the way for improving customer reliability and supporting a wider network when necessary [7]. The reliability assessment problem is extended to consider multi-energy microgrids with little or no support from wider networks, in which the energy balance must be met by the local energy resources. In such a scenario, the gas stored along. The pipelines (via a linepack) can be crucial for enhancing both the gas and electricity network reliability
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