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Resistive Shaping of Interconnected Low-Voltage Microgrids Operating Under Distorted Voltages

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Autor(es):
Alonso, Augusto Matheus dos Santos ; Brandao, Danilo, I ; Tedeschi, Elisabetta ; Marafao, Fernando P.
Número total de Autores: 4
Tipo de documento: Artigo Científico
Fonte: IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS; v. 69, n. 9, p. 12-pg., 2022-09-01.
Resumo

Beyond the impacting presence of nonlinear loads, low-voltage microgrids also experience low energy efficiency and resonance phenomena when operating interconnected to a distribution grid that suffers from distorted voltages. This article proposes a model-free control strategy capable of coordinating inverters existing within a dispatchable microgrid, allowing to operate it as a single-controllable entity that behaves like a resistor at selected harmonic frequencies. Such resistive shaping uses a centralized control architecture to steer inverters to distributively compensate reactive and harmonic currents, supporting active current sharing. Consequently, the microgrid point-of-common-coupling operates with a high power factor when the grid imposes distorted voltages. Additionally, if resonant components exist, the strategy supports harmonic resonance damping, which minimizes deterioration of voltage quality. For instance, comparative results show that, for the considered scenario, the proposed resistive shaping damps resonances up to 50% better than a previous approach that compensates harmonics using sinusoidal current synthesis. Simulation results carried out on a three-phase low-voltage microgrid testbench, considering three inverters, demonstrate the abovementioned capabilities of the proposed approach. Experimental results based on a single-phase microgrid prototype comprising two inverters with two linear loads and one nonlinear load validate the applicability of the method to real-life implementations. (AU)

Processo FAPESP: 16/08645-9 - Pesquisas interdisciplinares em redes inteligentes de energia elétrica
Beneficiário:João Bosco Ribeiro do Val
Modalidade de apoio: Auxílio à Pesquisa - Temático
Processo FAPESP: 17/24652-8 - Desenvolvimento de metodologia de controle cooperativo de geradores distribuídos em microrredes de energia com múltiplas considerações de operação
Beneficiário:Augusto Matheus dos Santos Alonso
Modalidade de apoio: Bolsas no Brasil - Doutorado