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Grid\u2010forming inverters based on traditional proportional\u2010integral (PI) control demonstrate good small\u2010signal stability in weak grids characterized by low short\u2010circuit ratios (SCR). However, when connected to strong grids, it often leads to sub\/super\u2010synchronous oscillations, causing instability in the system. To enhance the grid\u2010forming inverter's stability under strong grid conditions, this paper employing the linear active disturbance rejection control (LADRC) strategy in place of traditional dual PI voltage\u2010current control loops. This study establishes positive and negative sequence impedance models of grid\u2010forming inverters under traditional dual PI voltage\u2010current control and LADRC voltage loop control using harmonic linearization methods. Based on the established sequence impedance models and Nyquist criterion, the paper identifies the reasons behind sub\/supersynchronous oscillations induced by dual PI control under strong grid conditions. Stability comparisons are provided between dual PI control and LADRC control of grid\u2010forming inverters under different grid strengths. The comparative results demonstrate that grid\u2010connected inverters with LADRC exhibit superior adaptability to strong grids, demonstrating enhanced capability to suppress sub\/super\u2010synchronous oscillations. Simulation and experimental validations confirm the effectiveness of the LADRC control strategy.<\/jats:p>","DOI":"10.1002\/cta.4564","type":"journal-article","created":{"date-parts":[[2025,5,8]],"date-time":"2025-05-08T21:48:59Z","timestamp":1746740939000},"page":"560-575","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Research on Stability Enhancement Control Strategies for Grid\u2010Forming Inverters Under Strong Electric Grid Conditions Based on LADRC"],"prefix":"10.1002","volume":"54","author":[{"ORCID":"https:\/\/orcid.org\/0009-0007-3389-4337","authenticated-orcid":false,"given":"MengJie","family":"Hu","sequence":"first","affiliation":[{"name":"State Key Laboratory of Intelligent Power Distribution Equipment and System Hebei University of Technology  Tianjin China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9870-373X","authenticated-orcid":false,"given":"Yu","family":"Tang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Intelligent Power Distribution Equipment and System Hebei University of Technology  Tianjin China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,5,8]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1109\/TIE.2006.881997"},{"key":"e_1_2_8_3_1","first-page":"2858","article-title":"Harmonic Stability in Power Electronic\u2010Based Power Systems: Concept, Modeling, and Analysis","volume":"10","author":"Xiongfei W.","year":"2018","journal-title":"IEEE Transactions on Smart Grid"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1109\/OJIA.2020.3020392"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1109\/OJIA.2021.3074028"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1109\/TCSII.2022.3221134"},{"key":"e_1_2_8_7_1","doi-asserted-by":"crossref","unstructured":"M. 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