Photovoltaic Stand-Alone Power Generation System with Multilevel Inverter

Abstract

Abstract. This paper proposes a decentralized stand-alone photovoltaic (PV) system, which presents a set of advantages when compared to conventional stand-alone PV system. In the proposed system, the generated energy by the PV arrays is processed by multi-string MPPT step-up converters, which assure a maximum utilization of this energy. The storage system is designed in a decentralized configuration, enabling to achieve a reduction of maintenance cost of back-up system. Moreover, the output stage is composed by a multilevel dc-ac inverter, which enables higher efficiency, low distortion ac waveforms, low leakage currents and the use of low voltage rating semiconductor devices.

An improved MPPT interleaved boost converter for solar electric vehicle application

“…Indeed, the ripple and harmonic content of the current is one of the various phenomena influencing PV efficiency as well as battery lifetime [6]. So the main objective of this research is to minimize inductor size, capacitor, current/voltage ripples, and harmonic content.…”

Real-Time Simulation of Interleaved Converters with Decentralized Control

“…Furthermore, if the number of modules varies during operation, due to faults or to increase efficiency, gains and controllers often need to be modified accordingly. In this paper, a decentralized control algorithm is proposed for converter using interleaved carriers [1,2]. Interleaved carriers are widely used in multilevel converter, whether it is for multilevel voltage source converter (VSC) [2,3]or multilevel current source converter (CSC) [4].…”

Controle De Carga De Bancos De Baterias De Sistemas Fotovoltaicos Utilizando Uma Arquitetura Segmentada

“…Bancos de baterias (ou painéis fotovoltaicos) são subdivididos de forma que cada bloco trabalhe com tensões mais baixas, tendo, cada bloco, um número menor de unidades conectadas em série. Desconzi et al (2011), Bratcu et al (2011) e Walker & Sernia (2004 tratam de estruturas em cascata sob diferentes perspectivas. Nota-se que estas estruturas em cascata podem ser encontradas antes ou depois dos barramentos DC, com subpainéis (painéis segmentados), ou inversores de múltiplos níveis, respectivamente.…”

“…Estas estruturas são mais comuns nos sistemas conectados à rede. Desconzi et al (2011), propõe uma estrutura em que a energia gerada pelos painéis fotovoltaicos em um sistema autônomo é processada por diversos conversores MPPT, cada conversor com sua respectiva string. O sistema de armazenamento também é subdividido de acordo com o número de strings do painel fotovoltaico.…”