Kallamadi, M and Sarkar, Vaskar
(2016)
Generalised analytical framework for the stability studies of an AC microgrid.
The Journal of Engineering.
pp. 1-9.
ISSN 2051-3305
(In Press)
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.
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