DEELT - Artigos publicados em periódicos

URI permanente para esta coleçãohttp://www.hml.repositorio.ufop.br/handle/123456789/5267

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2017 - 20202

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Autor: search.filters.author.Fogli, Gabriel AzevedoAssunto: search.filters.subject.Grid-forming

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    Systematic design of a DLQR applied to grid-forming converters.
    (2020) Almeida, Pedro Machado de; Ribeiro, Adeilson da Silva Borges; Souza, Igor Dias Neto de; Fernandes, Marcelo Carvalho; Fogli, Gabriel Azevedo; Cuk, Vladimir; Barbosa, Pedro Gomes; Ribeiro, Paulo Fernando
    This article proposes a systematic state-space procedure to design an optimal discrete-time linear quadratic regulator applied to grid-forming converters. A comprehensive mathematical modeling of a voltage-sourced converter with an LC output filter is performed and a systematic way of including digital resonant compensators is addressed. The choice of weights is based on the minimization of selected transfer functions infinity norm, as well as on the stability margin and bandwidth. The effects of weighting on closed-loop transfer functions shape are analyzed and important points are discussed in order to establish a methodical way of choosing the weighting matrices. Experimental results are presented to validate the design and to demonstrate the system effectiveness with high loading and highly nonlinear balanced and unbalanced loads.
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    Modelling and control of an interface power converter for the operation of small diesel gen-sets in grid-connected and stand-alone modes.
    (2017) Fogli, Gabriel Azevedo; Almeida, Pedro Machado de; Barbosa, Pedro Gomes
    This paper presents the modelling and control design steps of a two-stage static conversion structure used as interface to integrate a diesel generator setinto a secondary distribution network. In order to guarantee that the inverter works within the PWM linear range, a boost converter is used to increase the DC voltage level. The proposed structure allows two operation modes, connected to the AC mains or isolated. In the isolated mode the interface converter may be controlled as grid-forming or grid-conditioning (active power filter). The inverter current controllers are designed in the synchronous reference frame together with multiple integrators in order to effectively track non-sinusoidal currents. The stability analysis is performed through the Nyquist plot. Experimental results obtained with a 5.5 kW diesel generator set are presented to validate the proposed system operation and control strategies.