Modelagem de pequenos sinais do conversor seguidor de rede no contexto de microrredes
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Abstract
The recent expansion of distributed generation in the context of microgrids, strongly stimulated by environmental and economic reasons, has allowed the emergence of increasingly larger and more complex structures, with several forms of generation, different amounts of converters, control techniques and operating modes, presence of local loads, among others. In this scenario, the development of small-signal models to analyze the stability of microgrids provides an important tool for greater assurance of a safe and efficient operation of these systems. Before, in the literature, it was possible to find several small-signal models applied to microgrids, however, none of them presented modularity, in the sense of allowing the easy representation of different configurations. Despite this absence having been filled in the research project “Modeling, Simulation and Control of Converters in a Distributed Generation Microgrid”, developed at IFMG Campus Betim, where a microgrid modular small-signal model was proposed, the model continued to present limitations in terms of the mode of operation of converters, since grid feeding converters, which are very relevant in this context, were not addressed. Thus, the objective of this work is the small-signal modeling of the grid feeding converter, focused on the application in the microgrid modular small-signal model. For validation of the modeling developed in this work, a simple structure of grid feeding converter and main grid is proposed, where, from a defined configuration, stability analyzes are carried out from the point of view of control gains. To demonstrate the ability to integrate the grid feeding model into the microgrid modular small-signal model, a structure with three converters, two with control techniques that emulate the synchronous machine (droop and synchronverter) and a grid feeding, presence of local loads and connected to the main grid is defined. Making use of the small-signal model of the proposed microgrid, validation results are presented.
