For the identification of series resonance in power system branches

the identification method of branch series resonance based on modified nodal admittance matrix modal method is proposed. First of all

when the network matrix modal method is used to identify the parallel connection of the nodes and the series resonance points of the loop

the corresponding resonant points are found to coincide. The theoretical analysis shows that the smaller the branch impedance ratio

the higher the coincidence degree of the corresponding series and parallel resonant points. Then

for branch series resonance

it is transformed into loop series resonance by adding virtual branch

and further transformed into parallel resonance identification by using the theory of system series-parallel resonance coincidence. Finally

the feasibility and correctness of the three node system and the IEEE14 node system are verified by simulation analysis.