Coordinated Utilization of Adaptive Inertia Control and Virtual Impedance Regulation for Transient Performance Increase of VSG Under Different Faults

Dongyin Zhang, Hanping Xu, Yicong Wang, Lei Chen, Yaxin Li, Ting Hu
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引用次数: 4

Abstract

For boosting the transient performance of a virtual synchronous generator (VSG) during different faults, this paper presents a methodology of collaboratively utilizing adaptive inertia control (AIC) and virtual impedance regulation (VIR). The VSG’s mathematical model is established, and its transient behaviors are probed. In the proposed coordination methodology, the function of the AIC is to flexibly change the rotor inertia in terms of the angular frequency variation, and the impact of the VIR is to timely and usefully eliminate the overcurrent risk. From these two benefits, the VSG’s power angle stability (PAS) enables to be kept, and the caused fault current rush can be powerfully mitigated to fulfill a low voltage ride through (LVRT) operation. To testify the feasibility and validity of the proposed coordination methodology, the VSG’s simulation model is built using MATLAB, and the VSG’s transient performance assessment is implemented by considering various faults. The findings show that the PAS margin is distinctly enhanced, and the LVRT problem of the VSG is well figured out. The simulation results favorably agree with the theoretical investigation.
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自适应惯性控制与虚拟阻抗调节协同应用于不同故障下VSG暂态性能提升
为了提高虚拟同步发电机在不同故障状态下的暂态性能,提出了一种自适应惯性控制(AIC)和虚拟阻抗调节(VIR)协同应用的方法。建立了VSG的数学模型,探讨了其瞬态特性。在所提出的协调方法中,AIC的作用是根据角频率变化灵活地改变转子惯量,而VIR的作用是及时有效地消除过流风险。由于这两个优点,VSG的功率角稳定性(PAS)得以保持,并且可以有力地减轻引起的故障电流涌,以实现低电压穿越(LVRT)操作。为了验证所提出的协调方法的可行性和有效性,利用MATLAB建立了VSG的仿真模型,并在考虑各种故障的情况下实现了VSG的暂态性能评估。结果表明,PAS边缘明显增强,很好地解决了VSG的LVRT问题。仿真结果与理论研究结果吻合较好。
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