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] |
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| Database: | Engineering Source |
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