Control por histéresis para un inversor buck-dual conectado a la red

Resumen

Los inversores monofásicos son ampliamente usados en diferentes aplicaciones de energías renovables. Aunque típicamente se usa el inversor de puente completo, el inversor buck-dual provee una ventaja  importante porque elimina el problema de posibles cortos-circuitos. Sin embargo, las soluciones reportadas en la literatura requieren inductores adicionales, usan controladores lineales diseñados para un punto de operación, o no se pueden usar en aplicaciones de conexión a la red. En este artículo se presenta un control por histéresis para un inversor monofásico buck-dual de puente completo con conexión a la red para inyección de corriente activa. En particular, se presenta el modelo matemático en variables de estado y se obtienen condiciones analíticas para garantizar la evolución de la dinámica de error dentro de un conjunto con límites establecido por el diseñador. Además, se discuten los elementos para diseñar la banda muerta requerida en la transición entre los semi-ciclos positivos y negativos de la tensión de la red. Finalmente, los resultados de simulación validan las principales características del controlador propuesto, así como el diseño de la banda muerta.

Palabras clave: buck-dual, microinversor, potencia activa, control por histéresis

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Publicado
2020-10-28