Development and validation of a generalized modeling approach for islanded inverter-based microgrids with static and dynamic loads

Development and validation of a generalized modeling approach for islanded inverter-based Micro-Grids with static and dynamic loads

Abstract:

State-space modeling approaches have been extensively used in stability studies of the conventional power system. These stability studies involve the development of state-space models of different components of the power system and then linearizing them around a steady-state or an equilibrium point and combining them on a common DQ reference frame. In this paper, a similar approach has been proposed to develop a generalized modeling approach for islanded inverter-based micro-grids (IIMGs) with static and dynamic loads. The proposed generalized modeling approach divides the whole IIMG system, virtually, into three sub-modules such as generation sub-module, network sub-module, and load sub-module. The load sub-module is further divided into passive, active and dynamic load sub-modules. To obtain the complete model of the IIMG system, all the individual sub-modules are modeled in a local dq reference frame and then combined on a common DQ reference frame. The developed model includes both low as well as high-frequency dynamics of IIDG units, network dynamics, and load dynamics. Eigenvalue analysis and time-domain simulations have been performed to validate the linearized and non-linear models, respectively, obtained from the proposed generalized modeling approach.