Small signal equivalent model of synchronous generator-based grid-connected microgrid using improved Heffron-Phillips model

When there are enormous number of systems, such as microgrids (MGs), in power systems, the study faces two challenges: nonlinearity and multiplicity. Therefore, in this paper, a new linear equivalent model (LEM) is proposed for synchronous generator (SG)-based MGs to reduce computation burden and complexity. The proposed LEM is based on a third-order linear model of SG. However, it includes equivalent models of vital controllers of SG-based MG; excitation and turbine-governor (EXS and GOV) systems. The ultimate aim of this study is to estimate parameters of LEM such that it behaves as a nonlinear detailed model (NDM). Measurements at point of common coupling (PCC) and genetic algorithm are used to reach this goal. The identified LEM is investigated at different operating points and the results are compared with NDM outputs to show accuracy of the proposed solution.