Analysis of Oscillatory Modes and Model Interactions of Microgrid

Stability analysis of microgrids based on real distribution network models and analysis of their model interactions are rarely reported in the published literature. Findings of such study is essential when designing robust primary and secondary controllers for distributed energy resources in microgrids. In this paper, a linearised model of a microgrid based on real 11 kV distribution feeder is presented, and the fidelity of the linearised model is validated against a detailed simulation model. A detailed eigenvalue analysis is performed to identify the dynamics and the stability of the microgrid. Eigenvalue sensitivity for various parameters, such as controller gains and network parameters are studied to identify the system stability margins and interactions among different distributed generators.