Variable-Weighted Virtual Impedance Control for Current Balancing in qZSI-VSG Systems under Asymmetric Fault Conditions.
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| Title: | Variable-Weighted Virtual Impedance Control for Current Balancing in qZSI-VSG Systems under Asymmetric Fault Conditions. |
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| Authors: | Zhang, Yang1, Zhong, Dingai1, Yang, Xiuhai1, Zhang, Wei1, Wei, Ziquan1, Cheng, Zhun2 120277982@qq.com |
| Source: | Progress in Electromagnetics Research C. 2026, Vol. 171, p288-300. 13p. |
| Subjects: | Impedance control, Synchronous generators, Electric inverters, PID controllers, Dynamic stability |
| Abstract: | To address output current over-limit issues, power oscillations, and degraded transient stability in virtual synchronous generators (VSGs) under asymmetric faults, this study proposes a variable-weight virtual-impedance-based current balancing control strategy for quasi-Z-source inverter-based VSG (qZSI-VSG) systems. First, a detailed mathematical model of the qZSI-VSG was established to analyze the influence of key parameters on the system’s dynamic behavior. By leveraging the VSG operating characteristics in the dq reference frame, a negative-sequence current reference generation method was subsequently developed to effectively suppress the negative-sequence components under various unbalanced grid conditions. In addition, a proportional integral (PI) controller is introduced to regulate active and reactive power deviations, enabling the online calculation of adaptive weighting factors for the real-time adjustment of the virtual impedance. This mechanism improves both the current balancing performance and transient response. The experimental results verified that the proposed strategy can significantly reduce negative-sequence currents and power oscillations, thereby enhancing the transient stability of the system during asymmetric faults and demonstrating its feasibility and effectiveness. [ABSTRACT FROM AUTHOR] |
| Copyright of Progress in Electromagnetics Research C is the property of Electromagnetics Academy and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Links: – Type: pdflink Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 194788543 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Variable-Weighted Virtual Impedance Control for Current Balancing in qZSI-VSG Systems under Asymmetric Fault Conditions. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Zhang%2C+Yang%22">Zhang, Yang</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Zhong%2C+Dingai%22">Zhong, Dingai</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Yang%2C+Xiuhai%22">Yang, Xiuhai</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Zhang%2C+Wei%22">Zhang, Wei</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Wei%2C+Ziquan%22">Wei, Ziquan</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Cheng%2C+Zhun%22">Cheng, Zhun</searchLink><relatesTo>2</relatesTo><i> 120277982@qq.com</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Progress+in+Electromagnetics+Research+C%22">Progress in Electromagnetics Research C</searchLink>. 2026, Vol. 171, p288-300. 13p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Impedance+control%22">Impedance control</searchLink><br /><searchLink fieldCode="DE" term="%22Synchronous+generators%22">Synchronous generators</searchLink><br /><searchLink fieldCode="DE" term="%22Electric+inverters%22">Electric inverters</searchLink><br /><searchLink fieldCode="DE" term="%22PID+controllers%22">PID controllers</searchLink><br /><searchLink fieldCode="DE" term="%22Dynamic+stability%22">Dynamic stability</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: To address output current over-limit issues, power oscillations, and degraded transient stability in virtual synchronous generators (VSGs) under asymmetric faults, this study proposes a variable-weight virtual-impedance-based current balancing control strategy for quasi-Z-source inverter-based VSG (qZSI-VSG) systems. First, a detailed mathematical model of the qZSI-VSG was established to analyze the influence of key parameters on the system’s dynamic behavior. By leveraging the VSG operating characteristics in the dq reference frame, a negative-sequence current reference generation method was subsequently developed to effectively suppress the negative-sequence components under various unbalanced grid conditions. In addition, a proportional integral (PI) controller is introduced to regulate active and reactive power deviations, enabling the online calculation of adaptive weighting factors for the real-time adjustment of the virtual impedance. This mechanism improves both the current balancing performance and transient response. The experimental results verified that the proposed strategy can significantly reduce negative-sequence currents and power oscillations, thereby enhancing the transient stability of the system during asymmetric faults and demonstrating its feasibility and effectiveness. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Progress in Electromagnetics Research C is the property of Electromagnetics Academy and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.2528/PIERC26051104 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 13 StartPage: 288 Subjects: – SubjectFull: Impedance control Type: general – SubjectFull: Synchronous generators Type: general – SubjectFull: Electric inverters Type: general – SubjectFull: PID controllers Type: general – SubjectFull: Dynamic stability Type: general Titles: – TitleFull: Variable-Weighted Virtual Impedance Control for Current Balancing in qZSI-VSG Systems under Asymmetric Fault Conditions. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Zhang, Yang – PersonEntity: Name: NameFull: Zhong, Dingai – PersonEntity: Name: NameFull: Yang, Xiuhai – PersonEntity: Name: NameFull: Zhang, Wei – PersonEntity: Name: NameFull: Wei, Ziquan – PersonEntity: Name: NameFull: Cheng, Zhun IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 09 Text: 2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 19378718 Numbering: – Type: volume Value: 171 Titles: – TitleFull: Progress in Electromagnetics Research C Type: main |
| ResultId | 1 |
