Small-signal model for stability analysis of different microgrid configurations

Abstract

The expansion of distributed generation in the context of microgrids has allowed the emergence of increasingly larger and more complex structures, with different amounts of converters and control techniques, different operating modes, presence of local loads, among others. In this context, the development of models to analyze the stability of microgrids provides an important tool for greater assurance of a safe and efficient operation. Thus, the objective of this paper is to propose a modular small-signal model, capable to represent different configurations of microgrids, for system stability analysis. As a case study is presented a microgrid with two converters, using two different control techniques: droop and synchronverter, with local loads and operating in connected mode. The paper validates the developed small- signal model, through the comparison with the behavior of a dynamic model simulated in MATLAB/Simulink, and presents stability analysis in relation to the controllers gains.