A novel space-vector algorithm for multilevel converters based on geometrical considerations using a new sequence control technique

his paper presents a fast and simple space vector modulation algorithm for voltage source multilevel converters for calculating the switching times and the space vectors using simple geometrical considerations. This method provides the nearest switching vectors sequence to the reference vector and calculates the on-state durations of the respective switching state vectors without involving trigonometric functions, look-up tables or coordinate system transformations which increase the computational load corresponding to the modulation of a multilevel converter. The low computational cost of the proposed method is always the same and it is independent of the number of levels of the converter. In addition, a new switching sequence control technique is presented for reducing the ripple of the DC-link voltage approximately in 66%

Algoritmo de modulación vectorial para convertidores multinivel de cuatro ramas utilizando coordenadas naturales

SEMINARIO ANUAL DE AUTOMÁTICA, ELECTRÓNICA INDUSTRIAL E INSTRUMENTACIÓN. SAAEI 2005 (.2005.SANTANDER, ESPAÑA)En este trabajo se presenta el primer algoritmo de modulación vectorial tridimensional para convertidores multinivel de cuatro ramas. Este convertidor se puede aplicar en el campo de los filtros activos o a los compensadores de corriente por el neutro para compensación de armónicos y corriente homopolar usando coordenadas naturales. Esta técnica simplifica en gran medida la selección del espacio tridimensional donde se encuentra un vector de tensión dado. El algoritmo reduce drásticamente la complejidad computacional y los cálculos para determinar los vectores activos con sus correspondientes tiempos que generan el vector de referencia de tensión. Además, la baja carga computacional del algoritmo propuesto es siempre la misma y es independiente del número de niveles del convertidor

The Age of Multilevel Converters Arrives

This work is devoted to review and analyze the most relevant characteristics of multilevel converters, to motivate possible solutions, and to show that we are in a decisive instant in which energy companies have to bet on these converters as a good solution compared with classic two-level converters. This article presents a brief overview of the actual applications of multilevel converters and provides an introduction of the modeling techniques and the most common modulation strategies. It also addresses the operational and technological issues

Multilevel Converters: An Enabling Technology for High-Power Applications

| Multilevel converters are considered today as the state-of-the-art power-conversion systems for high-power and power-quality demanding applications. This paper presents a tutorial on this technology, covering the operating principle and the different power circuit topologies, modulation methods, technical issues and industry applications. Special attention is given to established technology already found in industry with more in-depth and self-contained information, while recent advances and state-of-the-art contributions are addressed with useful references. This paper serves as an introduction to the subject for the not-familiarized reader, as well as an update or reference for academics and practicing engineers working in the field of industrial and power electronics.Ministerio de Ciencia y Tecnología DPI2001-3089Ministerio de Eduación y Ciencia d TEC2006-0386