文档介绍：A grid-connected photovoltaic power conversion system with single-phase multilevel inverter
Ersoy Beser ,
Birol Arifoglu ,
Sabri Camur ,
Esra Kandemir Beser,
Department of Electrical Engineering, Kocaeli University, Umuttepe Campus, 41380 Kocaeli, Turkey
Received 7 May 2010. Revised 26 September 2010. Accepted 28 September 2010. Available online 20 October 2010. Communicated by: Associate Editor Nicola Romeo.
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Abstract
This paper presents a grid-connected photovoltaic (PV) power conversion system based on a single-phase multilevel inverter. The proposed system fundamentally consists of PV arrays and a single-phase multilevel inverter structure. First, configuration and structural parts of the PV assisted inverter system are introduced in detail. To produce reference output voltage waves, a simple switching strategy based on calculating switching angles is improved. By calculated switching angles, the reference signal is produced as a multilevel shaped output voltage wave. The control algorithm and operational principles of the proposed system are explained. Operating PV arrays in the same load condition is a considerable point; therefore a simulation study is performed to arrange the PV arrays. After determining the number and connection types of the PV arrays, the system is configured through the arrangement of the PV arrays. The validity of the proposed system is verified through simulations and experimental study. The results demonstrate that the system can achieve lower total harmonic distortion (THD) on the output voltage and load current, and it is capable of operating synchronous and transferring power values having different characteristic to the grid. Hence, it is suitable to use the proposed configuration as a PV power conversion system in various applications.
Keywords
Photovoltaic;
Photovoltaic power conversion;
Grid-