考虑暂态功角稳定的VSG低电压穿越控制策略

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中图分类号：TM712 文献标志码：A 文章编号：1007-449X（2025）07-0108-11

Control strategy for VSG low-voltage ride-through considering transient angle stability

LI Bin12， ，GAO Kangjial²，JIAO Linfeng1，²，JIA Haoyang1²，GONG Xiangxiang 1，2 （1.School of Electrical Engineering and Automation，Henan Polytechnic University，Jiaozuo 4540O3，China; 2.Henan International Joint Laboratoryof DirectDriveand Controlof Intellgent Equipment，Jiaozuo 454003，China）

Abstract：To simultaneously address transient power angle instability and overcurrent in virtual synchro nous generator （VSG） during grid voltage sags，a low-voltage ride-through （LVRT） control strategy based on parameter adaptive adjustment was proposed. The voltage dip ratio was utilized as the fault detection signal. Active power reference was adaptively adjusted according to voltage and impedance，while virtual moment of inertia and damping coefficient were adaptively modified based on the voltage dip ratio， angular frequency derivative，and angular frequency deviation. This coordinated adaptation stabilized the VSG and facilitated rapid recovery to a stable operating point.The equal-area criterion was applied to analyze VSG power angle characteristics， verifying from a large-signal perspective that the proposed strategy enhances system stability. Compared to existing methods，this strategy innovatively accounts for virtual impedance's impact on transient power angle stability， suppressing overcurrent while achieving dynamic rapid recovery through autonomous parameter regulation. Simulations and experiments were conducted comparing effects of different control strategies on VSG performance.Results confirm correctness and effectiveness of the proposed LVRT strategy.

Keywords： virtual synchronous generator；adaptive strategy；low voltage ride-through； virtual impedance；transient power angle stability；overcurrent suppression

0引言

随着新能源不断并入电网、电力电子设备投入增加，电网呈现弱阻尼、低惯性特性，在并网运行时将面临严峻挑战[1-3]。（剩余13961字）