Inversor Monofásico para Geração Distribuída Conectada à Rede Elétrica, com Injeção de Potência Ativa e Capacidade de Compensação Reativa

This paper proposes a methodology for the active and reactive power flow control, applied to a low voltage grid-tie three-phase power inverter. The control technique is designed by means of feedback linearization and the pole placement is obtained using Linear Matrix Inequalities (LMIs) together with D-stability concepts. Through multi-loop control, the power loop uses adapted active and reactive power transfer expressions, in order to obtain the magnitude of the voltage and the power transfer angle to control the power flow between the distributed generation (DG) and the utility grid. The state-feedback linearization technique is applied at the whole control system in order to minimize the nonlinearities of the system, improving the controller's performance and mitigating potential disturbances. The methodology main idea is to obtain the best controllers with the lowest gains as possible placing the poles in the left-half s-plane region specified during the design procedure, resulting in fast responses with reduced oscillations. Demonstrating the feasibility of the proposal a 3 kVA three-phase prototype was experimentally implemented. Furthermore, experimental results demonstrate anti-islanding detection and protection against over/under voltage and frequency deviations.

Grid-tie Three-phase Inverter With Active and Reactive Power Flow Control Capability

Sampaio¹,

Brito²,

Melo³

et al. 2014

Estratégia de Saturação Dinâmica da Capacidade de Conversores Multifuncionais Conectados à Rede Elétrica

Bonaldo¹,

Paredes²,

Pomílio³

2015

Resumo -Este artigo propõe uma estratégia de controle que permite a utilização plena da capacidade de conversores multifuncionais conectados à rede elétrica. A técnica proposta é baseada na estimação dinâmica de um coeficiente de compensação ( ) para melhoria do fator de potência da rede no ponto de acoplamento da unidade consumidora, incluindo uma fonte de energia com o respectivo conversor e a carga local. Assim, o sinal de referência é proporcional a , que ajusta dinamicamente a intensidade da compensação conforme a capacidade de potência remanescente do conversor. Para demostrar a eficácia da estratégia proposta, resultados experimentais e de simulação são obtidos considerando um cenário real, no qual tanto a carga quanto a geração são intermitentes. Palavras-Chave -Conversores Multifuncionais, FiltroAbstract -This paper proposes a control strategy that allows the exploitation of the full capacity of the multifunctional grid-tied inverters. The strategy is based on the dynamic estimation of a compensation coefficient ( to improve the power factor at the point of common coupling. Thus, the reference signal is proportional to , which dynamically adjusts the amount of compensation depending on the remaining capacity of the power converter. To demonstrate the effectiveness of the proposed strategy, experimental results and simulation are obtained considering a real case, in which both the load and generation are intermittent.

Análise das Emissões Eletromagnéticas em Conversores Chaveados em Regime Transitório

Ricobom¹,

Júnior²,

Bonfim³

2019

The Current electromagnetic emissions standards, such as those produced by the CISPR committee, perform the radiated emission test of switched-mode converters only under a permanent operating regime. In this way, electromagnetic emissions generated during transients of starting or shutting down of these converters are not submitted to a control. These transients may cause electromagnetic interference issues, especially if the converters are electronic ballasts for lamps, which are usually present in a large number in the same environment and exposed to several daily cycles of