An Improved Impedance/Admittance Analysis Method Considering Collector Subsystem Transformation in Converter-Integrated Power Systems

To analyze oscillation phenomenon caused by the interaction between converters and an AC grid, impedance/admittance analysis method is a popular solution, in which each electrical component represented external matrix lumped formed for stability analysis. However, converter-integrated power systems considering typical collector subsystems (e.g., radial ring wind farms PV stations), impedance network reduction to form (LIM/LAM) becomes complicated particularly subsystem, affects efficiency of address this problem, paper proposes that can transform topology into pure-parallel so admittance much easier be derived. Algorithm complexity confirms its computational advantages. A fifty-converter system used verify effectiveness proposed method.