{"id":469,"date":"2026-04-13T17:18:06","date_gmt":"2026-04-13T07:18:06","guid":{"rendered":"https:\/\/wp.csiro.au\/epics\/?p=469"},"modified":"2026-04-17T17:55:19","modified_gmt":"2026-04-17T07:55:19","slug":"black-box-imedence-identification-and-stability-analysis-of-grid-connected-inverter-under-multiple-operating-points","status":"publish","type":"post","link":"https:\/\/wp.csiro.au\/epics\/black-box-imedence-identification-and-stability-analysis-of-grid-connected-inverter-under-multiple-operating-points\/","title":{"rendered":"6. Black-box imedence identification and stability analysis of grid connected inverter under multiple operating points"},"content":{"rendered":"<figure class=\"wp-block-image alignright size-large is-resized nba-caption-filter transcript__wrapper\"><div class=\"transcript__content\"><a href=\"https:\/\/wp.csiro.au\/epics\/files\/2026\/04\/Poster-Shibei-Li-Black-box-imedence-identification-and-stability-analysis-of-grid-connected-inverter-under-multiple-operating-points.pdf\" target=\"_blank\" rel=\" noreferrer noopener\"><img loading=\"lazy\" decoding=\"async\" width=\"722\" height=\"1024\" src=\"https:\/\/wp.csiro.au\/epics\/files\/2026\/04\/Screenshot-Poster-Shibei-Li-Black-box-imedence-identification-and-stability-analysis-of-grid-connected-inverter-under-multiple-operating-points-722x1024.png\" alt=\"\" class=\"wp-image-470\" style=\"width:300px\" 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https:\/\/wp.csiro.au\/epics\/files\/2026\/04\/Screenshot-Poster-Shibei-Li-Black-box-imedence-identification-and-stability-analysis-of-grid-connected-inverter-under-multiple-operating-points-70x100.png 70w, https:\/\/wp.csiro.au\/epics\/files\/2026\/04\/Screenshot-Poster-Shibei-Li-Black-box-imedence-identification-and-stability-analysis-of-grid-connected-inverter-under-multiple-operating-points-106x150.png 106w, https:\/\/wp.csiro.au\/epics\/files\/2026\/04\/Screenshot-Poster-Shibei-Li-Black-box-imedence-identification-and-stability-analysis-of-grid-connected-inverter-under-multiple-operating-points-247x350.png 247w, https:\/\/wp.csiro.au\/epics\/files\/2026\/04\/Screenshot-Poster-Shibei-Li-Black-box-imedence-identification-and-stability-analysis-of-grid-connected-inverter-under-multiple-operating-points.png 855w\" sizes=\"auto, (max-width: 722px) 100vw, 722px\"><\/a><\/div><figcaption class=\"transcript__info\"><div class=\"transcript__caption\"><div class=\"transcript__caption-text\"><p>Black-box imedence identification and stability analysis of grid connected inverter under multiple operating points<\/p>\n<\/div><\/div><\/figcaption><\/figure>\n\n\n<ul class=\"wp-block-list\">\n<li>Inverter-based resources (IBRs) support high renewable energy penetration, but also introduce new challenges to power system, such as low-frequency oscillations.<\/li>\n\n\n\n<li>Small-signal analysis enables stability assessment of grid-connected inverter system around steady state operating points.<\/li>\n\n\n\n<li>Small-signal models can be derived using component connection methods (CCM), but the reliance on internal IBR details motivates black-box approaches.<\/li>\n\n\n\n<li>To enable black-box modeling, frequency domain impedance is identified via frequency scan, with polynomial representations parameterized by multiple operating points.<\/li>\n\n\n\n<li>The identified impedance is synthesized into a state-space model (SSM) via vector fitting and combined with a single machine infinite bus (SMIB) grid model to form the overall system SSM.<\/li>\n\n\n\n<li>Eigenvalue-based analysis is conducted under varying short-circuit ratios (SCRs), and validated through time-domain simulations.<\/li>\n<\/ul>\n\n\n<div style=\"display:block;text-align:left\" class=\"nba-block nba-csiro__button wp-block-nba-csiro-button\" data-block-id=\"20a8af0e-8f284166-23bdf510\" data-block-type=\"nba-csiro__button\"><a href=\"https:\/\/wp.csiro.au\/epics\/poster-shibei-li-black-box-imedence-identification-and-stability-analysis-of-grid-connected-inverter-under-multiple-operating-points\/\" data-id=\"468\" data-type=\"attachment\" class=\" btn btn--primary \" target=\"_blank\"><span class=\"icon indicator indicator__external-link\" aria-label=\"Opens in a new tab\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" aria-hidden=\"true\" focusable=\"false\" class=\" svg-inline window-restore-regular\"><use xlink:href=\"#window-restore-regular\"><\/use><\/svg><\/span><span class=\"btn__text\">Download the poster<\/span><span class=\"btn__file-size\"><span class=\"btn__file-size--type\">PDF<\/span><span class=\"btn__file-size--size\">2 MB<\/span><\/span><\/a><\/div>\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Shibei Li, Mohammad Hasn Ravanji, Behrooz Bahrani &#8211; Department of Electrical and Computer Systems Engineering Monash University, Melbourne, Australia<\/p>\n","protected":false},"author":233,"featured_media":470,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"nba-redirect":"","footnotes":""},"categories":[6],"tags":[16,47,22],"class_list":["post-469","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-posters","tag-behrooz-bahrani","tag-poster","tag-shibei-li"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Australian EPICS Workshop<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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Black-box imedence identification and stability analysis of grid connected inverter under multiple operating points - Australian EPICS Workshop\" \/>\n<meta property=\"og:description\" content=\"Shibei Li, Mohammad Hasn Ravanji, Behrooz Bahrani - Department of Electrical and Computer Systems Engineering Monash University, Melbourne, Australia\" \/>\n<meta property=\"og:url\" content=\"https:\/\/wp.csiro.au\/epics\/black-box-imedence-identification-and-stability-analysis-of-grid-connected-inverter-under-multiple-operating-points\/\" \/>\n<meta property=\"og:site_name\" content=\"Australian EPICS Workshop\" \/>\n<meta property=\"article:published_time\" content=\"2026-04-13T07:18:06+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-04-17T07:55:19+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/wp.csiro.au\/epics\/files\/2026\/04\/Screenshot-Poster-Shibei-Li-Black-box-imedence-identification-and-stability-analysis-of-grid-connected-inverter-under-multiple-operating-points.png\" \/>\n\t<meta property=\"og:image:width\" content=\"855\" \/>\n\t<meta property=\"og:image:height\" content=\"1213\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Jane Sherman\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Jane Sherman\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/wp.csiro.au\\\/epics\\\/black-box-imedence-identification-and-stability-analysis-of-grid-connected-inverter-under-multiple-operating-points\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/wp.csiro.au\\\/epics\\\/black-box-imedence-identification-and-stability-analysis-of-grid-connected-inverter-under-multiple-operating-points\\\/\"},\"author\":{\"name\":\"Jane Sherman\",\"@id\":\"https:\\\/\\\/wp.csiro.au\\\/epics\\\/#\\\/schema\\\/person\\\/537e83a82b40935d523347c857272bd9\"},\"headline\":\"6. 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