Control and Optimization of Lattice Converters

Electronics

Jingyang Fang¹  Stefan Goetz²  Zhiting Mei³ 

[1] Department of Control Science and Engineering, Shandong University, Jinan 250100, China;Department of Electrical and Computer Engineering, Duke University, Durham, NC 27708, USA;Department of Mechanical Engineering and Material Science, Duke University, Durham, NC 27708, USA;

关键词: lattice converters;    efficiency optimization;    cascaded-bridge converters (CBCs);    modular multilevel converters (MMCs);    switched-capacitor converters;    topology;   

DOI  :  10.3390/electronics11040594

来源: DOAJ

【 摘 要 】

Multilevel converters continue their upward trend in renewable generation, electric vehicles, and power quality conditioning applications. Despite having satisfactory voltage capabilities, mainstream multilevel converters suffer from poor current sharing performances, thereby leading to the development of lattice converters, i.e., a strong and versatile type of future multilevel power converters. This article addresses two problems faced by lattice converters. First, we propose and detail how to optimize the efficiency of a given lattice converter by controlling the on/off states of H-bridge submodules. Second, we introduce the method that determines the voltage at each node of the converter in order to satisfy output voltage and current requirements. Design and analysis of lattice converters need a different mathematical toolbox than routinely exercised in power electronics. By use of graph theory, this article provides control methods of 3 × 3 and 4 × 4 lattice converters, satisfying various control objectives such as input/output terminals and output voltages. We further validate the methods with simulation results. The methodologies, algorithms, and special cases described in the article will aid further design and refinement of more efficient and easy-to-control lattice converters.

【 授权许可】

Unknown