Modelo Canónico Bidireccional para un Convertidor DC/DC Buck-Boost en Cascada
Palabras clave:
Convertidor bidireccional buck-boost en cascada, modelo canónico, método de promediado en el espacio de estados, modelo AC de pequeña señalBarra lateral del artículo
Contenido principal del artículo
Introducción: Los convertidores DC/DC bidireccionales son empleados en sistemas de gestión de energía, como en vehículos eléctricos con frenado regenerativo. El diseño de controladores robustos para estos sistemas requiere modelos dinámicos precisos que sean menos intensivos computacionalmente que los modelos conmutados completos. Este artículo presenta el desarrollo de los modelos promediados en estado estable (DC) y los modelos dinámicos de pequeña señal (AC) para los cuatro modos de operación de la topología de convertidor bidireccional buck-boost en cascada en modo de conducción continuo.
Objetivo: Desarrollar un modelo canónico bidireccional unificado que represente la dinámica del convertidor Buck-Boost en cascada en una forma estándar para los cuatro modos de operación.
Métodos: Se utilizó el método de promediado en el espacio de estados, perturbación y linealización para derivar las ecuaciones dinámicas para los cuatro modos de operación del convertidor. El modelo canónico se implementó en MATLAB/Simulink.
Resultados: Se derivó un modelo canónico bidireccional unificado, lo que facilita el análisis y el diseño. El modelo canónico se validó comparando su respuesta dinámica ante cambios tipo escalón de la tensión de entrada frente a un modelo conmutado tradicional, demostrando alta fidelidad.
Conclusiones: El modelo promediado propuesto es una herramienta precisa y computacionalmente eficiente para el diseño de sistemas de control en estas aplicaciones.
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