EVALUACIÓN DE TÉCNICAS SPWM MODIFICADAS PARA EL EQUILIBRIO DE POTENCIA EN UN CHB-MLI (EVALUATION OF MODIFIED SPWM TECHNIQUES FOR POWER BALANCING IN A CHB-MLI)
Resumen
Los dispositivos encargados de la conversión de corriente directa a corriente alternan son comúnmente conocidos como inversores. Existe una rama denominada CHB-MLI, la cual está constituida por múltiples celdas de puentes H conectadas en cascada. Estas celdas requieren de un conjunto de pulsos de comando para efectuar las conmutaciones de sus puentes H, es una tarea compleja debido a la gran cantidad de pulsos.
Las técnicas de modulación SPWM (capaces de generar los pulsos de comando requeridos) utilizadas en los CHB-MLI presentan la desventaja de ordenar a ciertas celdas tiempos de conmutación de mayor duración, con respecto a otras celdas. Esta situación ocasiona que las celdas con mayores tiempos de conmutación estén forzadas procesar mayores cantidades de potencia, y por tanto se encuentren más estresadas con respecto a las otras celdas con menores tiempos de conmutación. La literatura reporta versiones modificadas de las técnicas SPWM con la capacidad de distribuir equitativamente la cantidad de potencia que cada celda debe procesar. Para lo cual, se modifica la configuración de las modulaciones, reordenando la posición de las señales portadoras que son comparadas con la señal moduladora.
Este trabajo presenta tres técnicas de modulación SPWM modificadas que son implementadas en un CHB-MLI de 7 niveles. Se analiza el comportamiento de las técnicas sobre la potencia procesada de cada celda del CHB-MLI.
Palabras Clave: Balance de potencia, Inversores multinivel, SPWM.
Abstract
The devices responsible for the conversion of direct current to alternating current are commonly known as inverters. There is a branch called CHB-MLI, which is made up of multiple H-bridge cells connected in cascade. These cells require a set of command pulses to switch their H bridges, it is a complex task due to the large number of pulses.
The SPWM modulation techniques (capable of generating the required command pulses) used in the CHB-MLI have the disadvantage of ordering certain cells switching times of greater duration, with respect to other cells. This situation causes cells with longer switching times to be forced to process larger amounts of power, and therefore are more stressed with respect to the other cells with shorter switching times. The literature reports modified versions of SPWM techniques with the ability to equally distribute the amount of power that each cell must process. For which, the configuration of the modulations is modified, reordering the position of the carrier signals that are compared with the modulating signal.
This work presents three modified SPWM modulation techniques that are implemented in a 7-level CHB-MLI. The behavior of the techniques on the processed power of each cell of the CHB-MLI is analyzed.
Keywords: Power balancing, Multilevel inverter, SPWM.
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