Grid-forming(GFM)converters can support voltage

and their hybrid connection with grid-following(GFL)converters can effectively mitigate transient overvoltage issues in renewable energy station. However

the hybrid-connected system's numerous parameters and complex characteristics make the quantitative assessment of transient overvoltage challenging. To address this

a transient overvoltage evaluation method considering grid-following phase-locked loop(PLL)stability is proposed using the circuit superposition theorem and phasor diagrams

and key parameters affecting transient overvoltage are analyzed. Firstly

this paper simplifies the GFL and GFM hybrid-connected station according to converter characteristics

reducing the complexity of analysis.Secondly

the voltage dynamic process of the hybrid-connected station is analyzed from the three stages:before

during

and after short circuit faults. And this paper derives transient overvoltage assessment methods for the point of common coupling under different phase-locked loop stability conditions.In addition

based on the voltage assessment process

the influence of GFL parameters

GFM parameters

and the capacity ratio of GFL to GFM on transient overvoltage is explored. Finally

the transient overvoltage evaluation method and parameter impact analysis are verified through simulations.