Performance of Power-Limited Differential Power Processing Architectures in Mismatched PV Systems

Olalla, Carlos; Deline, Christopher A; Clement, Daniel; Levron, Yoash; Rodrı́guez, Miguel A.; Maksimović, Dragan

doi:10.1109/tpel.2014.2312980

Cited by 156 publications

(65 citation statements)

References 24 publications

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“…DMPPT improves the PV output power with respect to centralized MPPT, and offers additional features in terms of protection, particularly in case of malfunctioning, fire and output diagnostics. PV system configured based on DMPPT with DC-DC boost converter improve the overall system efficiency about 5% as compared with centralized MPPT system, reported in [20,21].…”

Section: Introductionmentioning

confidence: 95%

Performance Analysis of Incremental Conductance MPPT with Simple Moving Voltage Average Method for Distributed PV System

Ali¹,

Li²,

He³

2016

TOEEJ

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Abstract:In order to harvest photovoltaic energy efficiently, several methods exist, yet most of them failed to address the issues related to extract the maximum power under rapidly changing solar irradiance conditions. In conventional incremental conductance, large step size reduces tracking time but oscillation remains around maximum power point (MPP). However, small step size reduces the oscillation but results in slower tracking speed. This paper proposes a simple moving voltage average (SMVA) technique in conjunction with fixed step direct control incremental conductance (INC) maximum power point tracking (MPPT) method in order to reduce the photovoltaic (PV) generated voltage (V PV ) fluctuation and power losses under mismatching solar irradiance conditions in distributed PV system. Theoretical analysis and the simulation results revealed that the proposed SMVA technique provides fast and accurate tracking under mismatching irradiance conditions. Also, it significantly improves the voltage stability because of extremely small |dP/dV| around MPP as compared to the conventional fixed step direct control incremental conductance MPPT method. Finally, results show that the proposed method is suitable for distributed PV system under intermittent weather conditions not only in terms of voltage stability but also in overall system efficiency.

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Section: Introductionmentioning

confidence: 95%

Performance Analysis of Incremental Conductance MPPT with Simple Moving Voltage Average Method for Distributed PV System

Ali¹,

Li²,

He³

2016

TOEEJ

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“…O peso de inércia linear calculada por (20) diminui com a evolução da convergência do algoritmo. Além disso, uma boa capacidade de pesquisa global no início e uma boa capacidade de busca local nas últimas iterações são demonstradas em [41].…”

Section: B Técnica De Mppt-psounclassified

Sistema Fotovoltaico com Condicionamento Ativo de Energia Usando Mppt Baseado em Pso e Malha Feed-forward de Controle de Tensão do Barramento Cc

Silva¹,

Sampaio²,

Oliveira³

et al. 2016

Eletrônica de Potência

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Resumo -Este artigo apresenta a implementação de um sistema fotovoltaico (PV) monofásico conectado à rede elétrica com duplo estágio de conversão de energia, o qual não é afetado por problemas associados a sombreamentos parciais. Técnicas convencionais de rastreamento de máxima potência, tais como perturba e observa, não rastreia o ponto de máxima potência global (GMPP) quando o arranjo PV opera sob condições de sombreamento parcial. Como resultado, o desempenho geral do sistema diminui. Este trabalho usa o método de otimização por enxame de partículas para rastrear o GMPP, aumentando o desempenho do sistema PV. Simultaneamente, o sistema fotovoltaico é controlado para realizar o condicionamento ativo de potência, realizando supressão das correntes harmônicas e compensação da potência reativa da carga. Além disso, como principal contribuição deste trabalho, é proposta uma malha de controle feed-forward para reduzir variações bruscas de tensão do barramento CC na ocorrência de transientes de radiação solar e/ou temperatura. Tais variações podem influenciar no desempenho do sistema PV bem como ocasionar danos às chaves de potência. Os desempenhos estático e dinâmico do sistema PV são avaliados por meio de resultados experimentais. Palavras-Chave PSO-BASED MPPT TECHNIQUE APPLIED TO A GRID-TIED PV SYSTEM WITH ACTIVE POWER LINE CONDITIONING USING A FEED-FORWARD DC-BUS CONTROL LOOP1 Abstract -This paper presents a double-stage conversion single-phase grid-tied photovoltaic (PV) system implementation, which is not affected to problems associated to mismatching phenomena, such as partial shading. Usually, conventional maximum power point tracking techniques, such as perturb & observe, do not track the global maximum power point (GMPP) when the PV array is operating under partial shading. As result, the overall PV system performance decreases. This paper uses Artigo submetido em 18/01/2016. Primeira revisão em 16/03/2016. Aceito para publicação em 11/04/2016 por recomendação do Editor Marcelo Cabral Cavalcanti.particle swarm optimization algorithm to track the GMPP, increasing the PV system performance. Simultaneously, the PV system is controlled to carry out the active conditioning, suppressing load harmonic currents and compensating reactive power. In addition, as main contribution of this paper, a feed-forward control loop is proposed to reduce sudden variations of the DCbus voltage, in occurrence of solar radiation and/or temperature transients. Such variations can influence the PV system performance and can also cause damage in the switching devices. The static and dynamic PV system performances are evaluated through experimental results.

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“…8 and 11), which will be derived in the following section, would better explain how module voltages are equalized under partially-shaded conditions. Although individual MPPT is not feasible with the proposed voltage equalizer, equalizing module voltages simply would be beneficial enough when considering MPP voltages relatively insensitive to shading conditions compared to currents [17], [21], [22].…”

Section: B Major Benefits and Comparison With Conventional Topologiesmentioning

confidence: 99%

“…Equation (22) implies that R out-i depends on shading conditions. Where only one module is shaded (α = 1), the value of R out-i is equal to R eq-i + R in /N 2 .…”

Section: Derivation For DC Equivalent Circuitmentioning

confidence: 99%

“…17. From the slopes of the measured current characteristics, the values of R out under one-and two-module-shaded conditions were determined as approximately 0.25 and 0.39 Ω, respectively, based on which values of R in and R eq-i were also determined as 2.24 and 0.11 Ω, respectively, according to (22). Experimental and calculated efficiencies based on losses modeled in Section V matched well, and measured peak efficiencies were as high as 93-95%.…”

Section: B Fundamental Performancementioning

confidence: 99%

See 1 more Smart Citation

Two-Switch Voltage Equalizer Using an LLC Resonant Inverter and Voltage Multiplier for Partially Shaded Series-Connected Photovoltaic Modules

Uno

Kukita

2015

IEEE Trans. on Ind. Applicat.

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Performance of Power-Limited Differential Power Processing Architectures in Mismatched PV Systems

Cited by 156 publications

References 24 publications

Performance Analysis of Incremental Conductance MPPT with Simple Moving Voltage Average Method for Distributed PV System

Performance Analysis of Incremental Conductance MPPT with Simple Moving Voltage Average Method for Distributed PV System

Sistema Fotovoltaico com Condicionamento Ativo de Energia Usando Mppt Baseado em Pso e Malha Feed-forward de Controle de Tensão do Barramento Cc

Two-Switch Voltage Equalizer Using an LLC Resonant Inverter and Voltage Multiplier for Partially Shaded Series-Connected Photovoltaic Modules

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