A complex-power-based adaptive virtual impedance decoupling strategy for VSGs in low-voltage distribution networks

LIU Pu; WU Jintao; SHEN Yongpeng; ZHANG Qiukui; LIU Kun; CHANG Zhongting; FAN Caiyun; LI Xusheng

doi:10.19783/j.cnki.pspc.260295

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A complex-power-based adaptive virtual impedance decoupling strategy for VSGs in low-voltage distribution networks

更新时间：2026-09-23

- A complex-power-based adaptive virtual impedance decoupling strategy for VSGs in low-voltage distribution networks
- Power System Protection and Control Vol. 54, Issue 18, (2026)
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- DOI：10.19783/j.cnki.pspc.260295
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- Published：2026
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LIU Pu, WU Jintao, SHEN Yongpeng, et al. A complex-power-based adaptive virtual impedance decoupling strategy for VSGs in low-voltage distribution networks[J]. Power System Protection and Control, 2026, 54(18).
DOI：

LIU Pu, WU Jintao, SHEN Yongpeng, et al. A complex-power-based adaptive virtual impedance decoupling strategy for VSGs in low-voltage distribution networks[J]. Power System Protection and Control, 2026, 54(18). DOI： 10.19783/j.cnki.pspc.260295.

摘要

针对虚拟同步发电机(virtual synchronous generator

VSG)在电网广泛应用过程中受低压配电系统高阻抗比特性影响而导致有功与无功功率耦合严重的问题，提出一种具备自适应调节与参数鲁棒特性的虚拟阻抗自适应解耦策略。首先，构建含虚拟阻抗的功率传导模型，分析功率环动态特性对耦合过程的影响。然后，基于公共连接点复功率反馈构建虚拟阻抗自适应调节机制，通过在线重构虚拟阻抗，实现虚拟阻抗参数根据系统实时工况自适应调节，达到动态解耦。最后，仿真与实验结果表明：在1 p.u.额定有功功率阶跃工况下，所提策略可使实验测试的无功耦合波动量降低65.4%。该解耦策略无需依赖线路阻抗的精确先验信息，显著提升了系统的自适应鲁棒性，有效改善了VSG的控制精度及电压动态演化过程中的稳定性。

Abstract

To address the severe active and reactive power coupling of virtual synchronous generators (VSGs) caused by the high R/X ratio of low-voltage distribution systems

an adaptive virtual impedance decoupling strategy with adaptive regulation and parameter robustness is proposed. First

a power transfer model incorporating virtual impedance is established to analyze the effect of power-loop dynamics on the coupling process. Then

an adaptive virtual impedance regulation mechanism is developed based on complex power feedback at the point of common coupling (PCC). By reconstructing the virtual impedance online

the virtual impedance parameters can be adaptively adjusted according to real-time system operating condition

thereby achieving dynamic power decoupling. Finally

simulation and experimental results demonstrate that

under a 1 p.u. rated active power step

the proposed strategy reduces the experimentally measured reactive power coupling fluctuation by 65.4%. The proposed decoupling strategy does not rely on accurate prior knowledge of line impedance

significantly enhancing system adaptive robustness and improving VSG control accuracy and stability during dynamic voltage evolution.

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references

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