Unfolding PV Microinverter Current Control: Rectified Sinusoidal vs Sinusoidal Reference Waveform

Diana Lopez Caiza, Samir Kouro, Freddy Flores-Bahamonde, Ricardo Hernandez

Resultado de la investigación: Contribución a los tipos de informe/libroContribución a la conferenciarevisión exhaustiva

3 Citas (Scopus)

Resumen

Photovoltaic (PV) microinverter technology has become a popular solution in small-scale PV applications. The most used commercial microinverter topology is a two-stage converter composed by a dc-dc converter followed by a full-bridge unfolding inverter. The dc-dc-stage is in charge of performing MPPT and producing a rectified sinusoidal current waveform synchronized with the grid voltage, while the inverter stage only unfolds the current into an ac waveform. In this way no dc-link capacitor is needed (improving reliability), and only the dc-dc stage is performing PWM while the inverter stage is switching at fundamental frequency (improving efficiency). Since the reference current for the dc-dc stage is a rectified sinusoidal waveform, multi-resonant controllers are necessary. This type of controller is complex to design and requires more computational power compared to classic linear controllers, which is limited in PV microinverters, where lower-end micro-controllers are used to reduce cost. In this paper, a simple current control method is proposed, by following the opposite approach, in which a sinusoidal current waveform is controlled with easier controller design and implementation, and then folded or rectified in terms of the modulation in the dc-dc stage. The inverter stage unfolding function remains the same. In order to validate the proposed control, the interleaved flyback and push-pull unfolding PV microinverters are simulated, and the main features and differences of the traditional and proposed control are analyzed.

Idioma originalInglés
Título de la publicación alojada2018 IEEE Energy Conversion Congress and Exposition, ECCE 2018
EditorialInstitute of Electrical and Electronics Engineers Inc.
Páginas7094-7100
Número de páginas7
ISBN (versión digital)9781479973118
DOI
EstadoPublicada - 3 dic 2018
Publicado de forma externa
Evento10th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2018 - Portland, Estados Unidos
Duración: 23 sep 201827 sep 2018

Serie de la publicación

Nombre2018 IEEE Energy Conversion Congress and Exposition, ECCE 2018

Conferencia

Conferencia10th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2018
PaísEstados Unidos
CiudadPortland
Período23/09/1827/09/18

Áreas temáticas de ASJC Scopus

  • Ingeniería energética y tecnologías de la energía
  • Energías renovables, sostenibilidad y medio ambiente
  • Control y optimización
  • Redes de ordenadores y comunicaciones
  • Hardware y arquitectura
  • Gestión y sistemas de información

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