Thesis ANÁLISIS Y VALIDACIÓN DE UNA NUEVA TOPOLOGÍA MULTINIVEL
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Date
2010-04
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Abstract
Durante las últimas décadas la industria ha incrementado los niveles de potencia uti-
lizados en sus procesos productivos, lo que ha generado un incremento en la demanda
por convertidores de potencia cada vez más grandes y eficientes, alcanzando potencias del
orden de los MegaWatt. Por esta razón, los convertidores multinivel se han transformado
en una alternativa de gran interés para la industria y la academia, ya que ellos son capaces
de operar con voltajes en el rango de los kV y al mismo tiempo entregar potencias del
orden de los MegaWatt utilizando semiconductores de baja tensión.
En el presente trabajo se presenta un nuevo inversor multinivel, el cual ha sido bau-
tizado como Convertidor Hı́brido Multicelda o HMC por sus siglas en inglés, junto a
dos técnicas de modulación para dicha estructura. El convertidor está basado en las dos
topologı́as multinivel más populares, las cuales son el inversor de capacitores flotantes (FC)
y el convertidor multicelda en cascada (MC), a fin de implementar una nueva celda bajo
el concepto de dc-link variable. El trabajo consistió en el diseño de un prototipo de labo-
ratorio de 13 niveles y la implementación de 2 esquemas de modulación para la topologı́a,
donde se destaca el uso de un modulador LS-PWM para la obtención de patrones de
conmutación con cualidades espectrales superiores. Ambas técnicas fueron implementadas
en el prototipo. Los resultados experimentales demuestran que esta nueva topologı́a para
media tensión es efectivamente viable, capaz de generar voltajes de alta calidad y al mismo
tiempo lograr un buen factor de potencia de entrada.
During the last decades, industry has increased the power levels used in its productive processes, which has lead to an ever increasing demand for high-power high-efficiency converters ranging in the MegaWatt power level. Due to this, multilevel converters have become a very interesting alternative for industry and academy, since they are capable of operating with voltages in the kV range using low voltage semiconductors. In this work a new multilevel inverter is presented along with two ad-hoc modulation schemes. The new topology has been denominated the Hybrid Multicell Converter. The inverter is based on the two most popular multilevel topologies, namely the flying capac- itor converter (FC) and the cascaded multicell converter (CM), in order to devise a new cell structure under the concept of a variable dc-link. The work required the design and construction of a 13-level prototype and the implementation of the two proposed modula- tion algorithms. The use of a LS-PWM modulator in the FC structures is probably one of the most interesting aspects that were investigated, which delivered high quality voltage patterns with superior spectral qualities. The experimental results obtained show the feasibility of the topology for medium voltage applications, the converter’s ability to deliver high quality voltage waveforms and at the same time achieve good input power factor.
During the last decades, industry has increased the power levels used in its productive processes, which has lead to an ever increasing demand for high-power high-efficiency converters ranging in the MegaWatt power level. Due to this, multilevel converters have become a very interesting alternative for industry and academy, since they are capable of operating with voltages in the kV range using low voltage semiconductors. In this work a new multilevel inverter is presented along with two ad-hoc modulation schemes. The new topology has been denominated the Hybrid Multicell Converter. The inverter is based on the two most popular multilevel topologies, namely the flying capac- itor converter (FC) and the cascaded multicell converter (CM), in order to devise a new cell structure under the concept of a variable dc-link. The work required the design and construction of a 13-level prototype and the implementation of the two proposed modula- tion algorithms. The use of a LS-PWM modulator in the FC structures is probably one of the most interesting aspects that were investigated, which delivered high quality voltage patterns with superior spectral qualities. The experimental results obtained show the feasibility of the topology for medium voltage applications, the converter’s ability to deliver high quality voltage waveforms and at the same time achieve good input power factor.
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INVERSOR MULTINIVEL
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Casa Central Valparaíso