The deliverable proposes an analytical model for interphase spacers to reduce OHL span vulnerability to wet snow threat, an optimal reconfiguration strategy to reduce the energy not served to customers in distribution networks and the further extensions of functionalities for the methodology to identify the optimal mix of resilience-boosting measures.<\/p>\n","protected":false},"author":93,"featured_media":0,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"tags":[1525,1335,1340],"targets":[1317],"rapporti_tipologie":[762],"class_list":["post-195392","rapporti","type-rapporti","status-publish","hentry","tag-electrical-distribution","tag-planning-en","tag-resilience","targets-research","rapporti_tipologie-report-en"],"acf":{"dont_show_hompage":true,"projects":{"ID":188405,"post_author":"93","post_date":"2024-06-13 15:10:12","post_date_gmt":"2024-06-13 13:10:12","post_content":"","post_title":"Resilience and Security for Energy Systems","post_excerpt":"The goal of the project is to increase the security and resilience of the energy system in the face of greater environmental threats due to climate change, through the development of tools to support institutions and operators and the definition of an optimal set of actions to be adopted for this purpose.","post_status":"publish","comment_status":"open","ping_status":"closed","post_password":"","post_name":"resilience-and-security-for-energy-systems","to_ping":"","pinged":"","post_modified":"2024-07-02 10:30:30","post_modified_gmt":"2024-07-02 08:30:30","post_content_filtered":"","post_parent":0,"guid":"https:\/\/www.rse-web.it\/progetti\/resilience-and-security-for-energy-systems\/","menu_order":0,"post_type":"progetti","post_mime_type":"","comment_count":"0","filter":"raw"},"order_posts":"","dont_show_search":false,"related_posts":false,"show_on_slider":false,"single_post_data":{"titolo_spot":"","post_content":"
The report presents an analytical model of interphase spacers (IS), a passive measure to reduce the vulnerability of overhead line spans to wet snow and galloping, simulating the beneficial effects on phase conductors. Simulations show a significant increase of span failure return periods, especially adopting a combination of IS with anti-torsional devices.<\/p>\n
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Two optimal reconfiguration strategies are proposed to enhance distribution network resilience to N-k contingencies: they respectively solve a MILP problem to minimize load curtailment and a modified OPF including switches model. The former is less time consuming, but its accuracy depends on the effect of voltage limits and reactive power flows, while the latter is more accurate, incorporating all classical OPF constraints.<\/p>\n
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Moreover, the methodology for the identification of the optimal mix of measures for resilience enhancement is extended: it is customized for a new threat (indirect effects of strong wind) by adopting suitable vulnerability models for grid assets and by modeling new passive measures (maintenance of trees also outside the line right-of-way and the conversion of overhead lines into cables). Simulations on an IEEE test system confirm that the tree maintenance measure is suggested as it is more cost effective than the line conversion into cables, potentially competitive only considering jointly the two threats (wet snow and wind) and it is applied to the branches which assure the optimal cost-benefit tradeoff.<\/p>\n
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The efficiency of the method is improved by applying \u201cmemoization\u201d to the simulation (avoiding repetition of already simulated code). The speedup factor on a simple system ranges from 11.4 to 41.7 times with respect to the version without memoization (with greater speedups for the cases with higher computation burdens). Also, the application of the Variable Neighborhood Descent (VND) technique further reduces the computation time with respect to the \u201cmemoize in simulation\u201d approach and slightly improves the objective function values.<\/p>\n
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Finally, the optimal mix method is extended to consider the construction of new lines (resilience-oriented transmission grid expansion). Given the combinatorial complexity of this problem, a submodule selects the candidates of new lines as branches connecting substations with the lowest and highest values of a specific indicator (e.g. Expected Energy Not Served). The solutions of a test application still rely on anti-torsional devices and on tree maintenance practices, which are cheaper than building new (greenfield) lines.<\/p>\n","link_estreno":false,"scarica_file":[{"download_option":"download","file_name":"Download Deliverable","download":{"ID":195393,"id":195393,"title":"Evolution of the methodology for the identification of the optimal mix of the resilience","filename":"Evolution-of-the-methodology-for-the-identification-of-the-optimal-mix-of-the-resilience.pdf","filesize":2365201,"url":"https:\/\/www.rse-web.it\/wp-content\/uploads\/2024\/09\/Evolution-of-the-methodology-for-the-identification-of-the-optimal-mix-of-the-resilience.pdf","link":"https:\/\/www.rse-web.it\/en\/reports\/evolution-of-the-methodology-for-the-identification-of-the-optimal-mix-of-the-resilience-enhancing-measures-modelling-of-new-countermeasures-and-extension-of-the-approach-to-the-resilience-oriented-t\/evolution-of-the-methodology-for-the-identification-of-the-optimal-mix-of-the-resilience\/","alt":"","author":"93","description":"","caption":"","name":"evolution-of-the-methodology-for-the-identification-of-the-optimal-mix-of-the-resilience","status":"inherit","uploaded_to":195392,"date":"2024-09-11 13:19:14","modified":"2024-09-11 13:19:14","menu_order":0,"mime_type":"application\/pdf","type":"application","subtype":"pdf","icon":"https:\/\/www.rse-web.it\/wp-includes\/images\/media\/document.png"}}],"button":{"text":"","link":""},"referente_group":false,"data_emissione":"2023-12-31","autori":"A. Pitto, E. Ciapessoni, M. Rossi, C. Carlini, M. Rossini (RSE S.p.A.)","rapporto":"","rif_rse":"23012608"},"satellite_post_url":""},"yoast_head":"\n