Abstract
The objective is to address the small-signal stability analysis of a renewable-driven AC microgrid in the context of the practical usage and application. The state-space modelling of the system is generalised over all possible microgrid configurations. It is shown that there exist two simple templates to represent the dynamics of any type of load. The dynamics of any type of source (including the utility grid during the grid-connected operation) can be represented through a single template. Thus, the effective number of the different types of dynamic element is minimised and set fixed irrespective of the actual microgrid composition. In addition, similar loads are represented in the form of a single group to reduce computational complexity. A systematic procedure for constructing the system matrix using the prescribed source and load templates is discussed. The developed framework is applied on a test system having complex loads for both grid-connected and islanded operations. It is a common observation that system stability is influenced by the interactions between inertial and non-inertial components. To overcome this issue, suitable parameters are identified and tuned by performing system level study.
Highlights
A microgrid is basically the integration of small-scale distributed energy resources within a locality [1]
Additional delay block is used in source operating in drooping mode and phase locked loop (PLL) of voltage source rectifier (VSR) fed DC load to achieve better performance
A systematic procedure is prescribed for the smallsignal stability analysis of a microgrid with the scope for general applications
Summary
A microgrid is basically the integration of small-scale distributed energy resources within a locality [1]. The above mentioned time-scale decomposition may not be justified in the presence of low-inertia sources It is, shown in [8] that the load dynamics can have significant effects on the stability of a microgrid. There is no need to rework the whole procedure of system state matrix construction whenever there is a change in the microgrid configuration This may, in turn, largely alleviate the stability studies of a microgrid. Additional delay block is used in source operating in drooping mode and phase locked loop (PLL) of VSR fed DC load to achieve better performance. This renders drooping mode source to work for both grid-connected and islanded modes of operation.
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