A Discussion of Eigenvalue-based and Impedance- based Methods in VSC System

As the penetration rate of distributed energy in the power system continues increasing, the stability of the power system is affected by more factors. However, the small signal modeling method used for system stability analysis lacks a consensus. In this paper, the voltage source converter (VSC) system is used as an example to discuss the pros and cons of two methods. Building the full-order state-space model in time-domain and in frequency-domain, the impedance model has also been built. The time-domain system simulation has developed to verify the accuracy of two models in MATLAB/simulink. On the basis of the existing models, the impact of the system parameters will be analyzed.