Enhanced Reliability of 1500-V Photovoltaic Inverters with Junction Temperature Limit Control

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Abstract

This paper investigates the potential to enhance the reliability of 1500-V single-stage photovoltaic (PV) inverters with a junction temperature control strategy, where PV inverters can operate either in the maximum power point tracking mode or a junction temperature limit control mode depending on the thermal stress on the inverter power devices. With this, the junction temperature of the power devices in the PV inverter can be kept below a certain limit during operation. The effectiveness (i.e., reliability enhancement) of the proposed junction temperature control on the PV inverter reliability is demonstrated on a 60-kW three-level 1500-V PV inverter installed in Denmark. Case study results indicate that the proposed control has a high ability to enhance the inverter reliability, where the lifetime of the highest stressed power device can be extended to a large extent, while incurring a negligible reduction in energy yield.
Original languageEnglish
Title of host publication 2021 IEEE 12th Energy Conversion Congress & Exposition - Asia (ECCE-Asia)
Number of pages7
PublisherIEEE Press
Publication date13 Jul 2021
Pages243-249
Article number9479356
ISBN (Electronic)9781728163444
DOIs
Publication statusPublished - 13 Jul 2021
Event12th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2020 - Virtual, Detroit, United States
Duration: 11 Oct 202015 Oct 2020

Conference

Conference12th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2020
Country/TerritoryUnited States
CityVirtual, Detroit
Period11/10/202015/10/2020
SponsorIEEE Industrial Application Society (IAS), IEEE Power Electronics Society (PELS)

Keywords

  • Photovoltaic (PV) inverters
  • lifetime
  • maximum power point tracking (MPPT)
  • reliability

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