An Evaluation Method of Voltage Support Capability for Grid-Forming Inverter Applicable for Systems with Various R/X ratios

With the increasing integration of grid-forming inverters in power systems, it is of great significance to evaluate their voltage support capability to guide the operation of power systems. This paper proposes an evaluation method of voltage support capability for grid-forming inverter applicable for system with various RlX ratios. Firstly, considering the generalized droop control of grid-forming inverter, the amplitude motion model of the grid-forming inverter is built under active and reactive power disturbances. Then two voltage evaluation indicators are proposed, which accounts for the impact of both the active and reactive power on voltage support capability. Based on the two indicators, the influence of control parameters (i.e. voltage loop parameters, droop coefficients) of grid-forming inverter on voltage support capacity is further analyzed. Finally, simulations demonstrate that the proposed evaluation method can effectively evaluate the voltage support capability of grid-forming inverters under active and reactive power disturbances.