Design and Analysis of the synchronization control method for BCM/DCM current-mode flyback micro-inverter

Zhang, Zhe; Chen, Min; Chen, Wang; Qian, Zhaoming

doi:10.1109/apec.2013.6520187

Cited by 12 publications

(4 citation statements)

References 31 publications

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“…Grande parte dos microinversores empregados em baixa potência e integrados com a fonte geradora são soluções de estágio único, que apresentam algumas vantagens como modularidade, aumento de eficiência de rastreamento do MPP, uma vez que podem diminuir os problemas com sombreamento (para geração fotovoltaica) e a redução dos custos de instalação por utilizar menor quantidade de material [4].…”

Section: Introductionunclassified

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Inversores do Tipo Forward para Conexão de Fontes Renováveis à Rede Elétrica

Lazzarin¹,

Coelho²,

Facchinello³

2018

Eletrônica de Potência

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Resumo -Este artigo propõe dois inversores do tipo Forward, os quais foram concebidos para a conexão de fontes renováveis à rede elétrica através de um estágio único de conversão. As topologias permitem fazer o controle da corrente injetada na rede e da tensão de entrada e, devido ao ganho do transformador, podem ser aplicados em tensões de entrada menores ou maiores que a tensão da rede. As duas topologias operam no modo de condução contínuo e diferem-se entre si pela técnica de desmagnetização do transformador. Uma emprega enrolamento terciário e foi concebida para potências entre 200∼500 W. A outra utiliza a estrutura Forward com dois interruptores e, assim, desmagnetiza o transformador pelo enrolamento primário e foi concebida para sistemas de 500∼800 W. O artigo aborda princípio de operação, análise estática, função de transferência, dimensionamento dos filtros e projeto do controle das topologias. Elas são validadas experimentalmente em uma aplicação com 85 V de tensão de entrada e 110 V eficazes de tensão de rede. Os resultados mostraram uma corrente injetada à rede elétrica com fator de potência maior que 0,98 e uma distorção harmônica menor que 3,75%, além de um rendimento acima de 84% em potência nominal.Palavras-chave -Conversor Forward, Fontes Renováveis de Energia, Inversores, Rede Elétrica. FORWARD-TYPE INVERTERS FOR GRID CONNECTED RENEWABLE POWER SOURCESAbstract -This paper proposes two new Forwardtype inverters which were designed for single stage gridconnected renewable power sources. The topologies allow to control the current to be injected in the grid, the input voltage and, due to the transformer gain, they can be used for input voltages lower or higher than the grid voltage. The two topologies operate in continuous conduction mode and differ amongst themselves due to the transformer demagnetization technique. One uses tertiary winding and was intended to powers between 200∼500 W. The other uses the two-switches Forward structure and, thereby, demagnetizes through the primary winding and was intended to systems with 500∼800 W. In this paper the operation principles, the static analysis, the transfer function, the filter and control design are discussed. They The results showed a current injected into the grid with a power factor higher than 0.98 and a total harmonic distortion lower than 3.75%, in addition to an efficiency higher than 84% in nominal power.

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Section: Introductionunclassified

“…Algumas opções são descritas na literatura para solucionar esse problema, como a utilização de técnicas de comutação suave [10], combinação de modos de condução entre descontínuo e crítico [4], [8], [9], ou, até mesmo, condução contínua [13] o que exigiria componentes extras e aumento na complexidade de projeto.…”

Section: Introductionunclassified

Inversores do Tipo Forward para Conexão de Fontes Renováveis à Rede Elétrica

Lazzarin¹,

Coelho²,

Facchinello³

2018

Eletrônica de Potência

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“…Furthermore, [11] proposes a multi-mode IC control scheme for its soft-switched flyback converter to achieve load regulation. Moreover, [12] proposes a synchronization control method for BCM/DCM currentmode flyback micro-inverter, recommending the use of a digital controlled closed-loop synchronization scheme. All referenced proposed methods involve costly and complex control schemes, especially when featuring interleaving.…”

Section: Introductionmentioning

confidence: 99%

A novel low cost PV micro-inverters based on analog control and interleaving method

Najm

Huang

2015

2015 IEEE Applied Power Electronics Conference and Exposition (APEC)

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This paper proposes a novel simplified low cost analog implementation of a master/slave methodology resulting in an efficient soft-switched interleaved variable frequency flybacks operating in the boundary conduction mode (BCM). The scheme is suitable for PV micro-inverters and other applications such as battery chargers. The circuit allows for master/slave synchronization while copying the ON time of the master flyback to the slave one, which result in component count and cost reduction. The proposed discrete analog implementation utilizes a drive winding embedded in the master flyback transformer, which also controls the start of the ON time of the slave flyback. Hence, a voltage control oscillator (VCO) method is adopted. Such technique helps simplify the control and reduce the losses of the drive circuits while eliminating the need for an auxiliary startup supply. Operation procedure, design considerations, and experimental results are presented in this paper. The implementation simplicity of the scheme at low cost is demonstrated while reaching impressive performance. Keywords-PV micro-inverters; interleaved BCM variable frequency flybacks; master/slave synchronization; voltage control oscillator; low cost; analog implementation I.978-1-4799-6735-3/15/$31.00 ©2015 IEEE

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“…When sun exposure of the modules is uniform, a single (centralized) inverter can be used in small-medium PV plant. In other cases, when non uniform working conditions are more likely, string inverters or micro inverters are used instead [2][3][4]. Moreover performances of an unequally irradiated PV plant can be improved by different connection topologies of the PV plant.…”

Section: Introductionmentioning

confidence: 99%

Proof of Concept of an Irradiance Estimation System for Reconfigurable Photovoltaic Arrays

et al. 2015

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Abstract:In order to reduce the mismatch effect caused by non-uniform shadows in PV arrays, reconfigurable interconnections approaches have been recently proposed in the literature. These systems usually require the knowledge of the solar radiation affecting every solar module. The aim of this work is to evaluate the effectiveness of three irradiance estimation approaches in order to define which can be well suited for reconfigurable PV arrays. It is presented a real-time solar irradiance estimation device (IrradEst), implementing the three different estimation methods. The proposed system is based on mathematical models of PV modules enabling to estimate irradiation values by sensing a combination of temperature, voltage and current of a PV module. Experimental results showed generally good agreement between the estimated irradiances and the measurements performed by a standard pyranometer taken as reference. Finally one of the three methods was selected as possible solution for a reconfigurable PV system.

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Design and Analysis of the synchronization control method for BCM/DCM current-mode flyback micro-inverter

Cited by 12 publications

References 31 publications

Inversores do Tipo Forward para Conexão de Fontes Renováveis à Rede Elétrica

Inversores do Tipo Forward para Conexão de Fontes Renováveis à Rede Elétrica

A novel low cost PV micro-inverters based on analog control and interleaving method

Proof of Concept of an Irradiance Estimation System for Reconfigurable Photovoltaic Arrays

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