Control digital desacoplado de inversores trifásicos de cuatro piernas para alimentar cargas equilibradas y desequilibradas
DOI:
https://doi.org/10.4995/riai.2020.13011Palabras clave:
Inversor Trifásico, Electrónica de Potencia, Control por modelo interno, DesacoplamientoResumen
Este trabajo presenta una estrategia de control digital para inversores trifásicos de cuatro piernas, para cumplir con el requerimiento de normas internacionales de calidad de energía para UPS cuando se alimentan cargas equilibradas y desequilibradas. La estrategia de control propuesta se desarrolla en el marco de referencia dq0 en tiempo discreto, posee un lazo interno para controlar la corriente de los inductores y un lazo externo para controlar la tensión de salida. Se demuestra que utilizando controladores convencionales pueden desacoplarse las tensiones de los ejes d y q, en todo el rango de funcionamiento del inversor, lo que permite diseñar los controladores del lazo externo de control de tensión como sistemas SISO independientes, cumpliéndose los requerimientos de régimen transitorio y de régimen permanente impuestos por norma. Para mejorar el desempeño del inversor cuando se alimentan cargas desequilibradas, se propone utilizar un controlador Proporcional-Resonante únicamente en el lazo interno del eje 0, lográndose una estrategia de control simple y, en consecuencia, de bajo costo computacional. Se presentan resultados de simulación y experimentales que permiten validar la estrategia de control propuesta.
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