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The strategy integrates Linear Active Disturbance Rejection Control (LADRC) for robust positive sequence voltage regulation, Proportional Integral with repetitive control (PI + RC) for harmonic suppression in positive sequence currents, and a Quasi-Proportional Resonance (QPR) controller for negative sequence components in the static coordinate system. By doing so, it simplifies negative sequence control and combines PI + RC to improve the dynamic response and eliminate periodic errors. In the context of symmetry, the proposed strategy effectively reduces the total harmonic distortion (THD) and the three-phase current imbalance degree. Simulation results show significant improvements: under balanced loads, THD is reduced by 41.5% (from 1.95% to 1.14%) compared to traditional PI control; under single-phase and three-phase unbalanced loads, THD decreases by 52.7% (2.56% to 1.21%) and 48.1% (2.39% to 1.24%), respectively. The system\u2019s settling time during load transients is shortened by over 30%, and the three-phase current imbalance degree is reduced by 60\u201370%, which validates the strategy\u2019s effectiveness in enhancing power quality and system stability, thus restoring and maintaining the symmetry of the power output.<\/jats:p>","DOI":"10.3390\/sym17050716","type":"journal-article","created":{"date-parts":[[2025,5,7]],"date-time":"2025-05-07T11:46:19Z","timestamp":1746618379000},"page":"716","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Improved Bipolar Coordinate Control Strategy for 400 Hz Inverter in Aviation Ground Power Supply"],"prefix":"10.3390","volume":"17","author":[{"given":"Xinwen","family":"Bi","sequence":"first","affiliation":[{"name":"College of Computer Science and Technology, Beihua University, Jilin 132013, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shuairan","family":"Yu","sequence":"additional","affiliation":[{"name":"College of Electrical and Information Engineering, Beihua University, Jilin 132013, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pengfei","family":"Liu","sequence":"additional","affiliation":[{"name":"College of Electrical and Information Engineering, Beihua University, Jilin 132013, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4320-5220","authenticated-orcid":false,"given":"Yanming","family":"Cheng","sequence":"additional","affiliation":[{"name":"College of Electrical and Information Engineering, Beihua University, Jilin 132013, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2025,5,7]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Liu, C.-X., Ma, W.-M., Sun, C., and Hu, W.-H. 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