Virtual synchronous generators (VSGs), with the operational characteristics of synchronous generators (SGs), have been employed in renewable energy generation grid-connected systems to solve the problem of insufficient equivalent inertia, which is caused by the high permeability of distributed generation systems in the grid. However, a VSG does not possess low voltage ride-through (LVRT) capability. A novel LVRT control strategy for a VSG based on virtual self-inductive flux linkage is proposed in this paper. First, the electromagnetic transient response mechanism of a SG under grid faults is analyzed in detail. Then, a memory and retention strategy are proposed to simulate the effect of the switch law. Furthermore, the virtual q-axis armature self-inductance is introduced into the VSG and a virtual self-inductive magnetic chain is utilized to block the change of the transient fault current. This helps the inverter adjust the output voltage quickly. In addition, under the premise of meeting the reactive power margin, the reactive power compensation strategy is optimized to achieve a quick response in terms of the reactive power compensation of grid faults, which is helpful for realizing the LVRT of a VSG. Finally, the feasibility and effectiveness of the proposed LVRT method are verified by thorough simulation results.

具有同步发电机（SGs）运行特性的虚拟同步发电机（VSG）已用于可再生能源发电并网系统中，以解决等效惯量不足的问题，该问题是由分布式发电系统的高磁导率引起的。网格。但是，VSG不具有低压穿越（LVRT）功能。提出了一种基于虚拟自感通量链的VSG LVRT控制策略。首先，详细分析了电网故障下电网的电磁瞬态响应机理。然后，提出了一种记忆和保留策略来模拟切换定律的效果。此外，将虚拟的q轴电枢自感引入VSG，并利用虚拟的自感磁链来阻止瞬态故障电流的变化。这有助于逆变器快速调节输出电压。另外，在满足无功裕度的前提下，优化了无功补偿策略，可以在电网故障的无功补偿方面实现快速响应，有利于实现VSG的LVRT。最后，通过全面的仿真结果验证了所提出的LVRT方法的可行性和有效性。针对电网故障的无功补偿，对无功补偿策略进行了优化，以实现快速响应，这有助于实现VSG的LVRT。最后，通过全面的仿真结果验证了所提出的LVRT方法的可行性和有效性。针对电网故障的无功补偿，对无功补偿策略进行了优化，以实现快速响应，这有助于实现VSG的LVRT。最后，通过全面的仿真结果验证了所提出的LVRT方法的可行性和有效性。