在面对电网故障导致的电压跌落时，为了解决构网型储能变流器在低电压穿越时的电流越限和电压支撑能力有限的问题，提出了一种计及低电压穿越电流限幅策略的虚拟同步发电机（Virtual Synchronous Generator, VSG）与静止无功发生器（static var generator, SVG）混合系统无功协调控制方法。首先，本文介绍了VSG的典型控制策略，并对其在不同程度电网电压跌落下的暂态特性功角曲线进行分析。随后，对已有的q轴优先限流策略加以改进，根据d轴电流减小值等比例减少有功功率参考值，得到了有功参考自适应的q轴优先限流策略。同时，针对电网电压严重跌落时单一VSG电压支撑能力有限的问题，建立了SVG与VSG混合系统模型，提出了相应的无功分配策略。最后，通过SIMULINK仿真验证了理论分析的有效性。结果表明：所提限流策略可有效限制输出电流，混合系统控制方法可以大大提升电网电压跌落时的恢复程度。

To address the challenges of current over-limitation and limited voltage support capability in grid-forming energy storage converters during low-voltage ride-through (LVRT) under grid fault-induced voltage sags, this study proposes a reactive power coordination control strategy for a hybrid Virtual Synchronous Generator (VSG) and Static Var Generator (SVG) system incorporating an LVRT current limiting strategy. Initially, the typical control methodology of VSG is presented, followed by a transient characteristic analysis of its power-angle curve under various grid voltage dip scenarios. Subsequently, an improved q-axis priority current limiting strategy is developed, where the active power reference value is proportionally reduced according to the diminished d-axis current, resulting in an adaptive active power reference q-axis priority current limiting approach. Furthermore, to overcome the restricted voltage support capacity of standalone VSG during severe grid voltage sags, a collaborative control framework integrating SVG with VSG is established, accompanied by a reactive power allocation strategy. The effectiveness of the proposed methodology is conclusively validated through SIMULINK simulation results. The experimental results demonstrate that the proposed current-limiting strategy effectively restricts the output current, while the hybrid system control methodology significantly enhances voltage recovery performance during grid voltage sags.