Abstract：Grid-forming converter（GFC）can provide voltage and frequency support for the power grid，

effectively improving the stability of power electronic power systems，but there is a risk of transient instability

under large disturbances. By studying the key factors affecting the transient stability of GFC and conducting

quantitative analysis，the transient instability mechanism of GFC was revealed，and the critical amplitude value for

GFC to maintain voltage stability during the transient period was derived. On this basis，a method of adaptive

virtual resistance to adjust the voltage amplitude and improve the transient stability of GFC was proposed. The

phase diagram curve analysis fully revealed that the proposed method can improve the transient stability of GFC.

Finally，the correctness and effectiveness of the proposed method were verified through simulation and

experiments.

        Key words：grid-forming converter（GFC）；transient stability；amplitude stability；virtual resistor；phase

diagram curve

     Format Citation:吕振华，李强，张森. 基于虚拟电阻的构网变流器电压幅值调节策略[J].电气传动, 2026,56(07):56-64. LÜ Zhenhua，LI Qiang，ZHANG Sen. Voltage amplitude adjustment strategy for grid-forming converters based on virtual resistors [J].Electric Drive,56(07):56-64