Reliability Assessment of NPC inverters in PV Systems Under Power Degradation and Over-Temperature Derating Operation

Meng Chen*, Ariya Sangwongwanich, Dao Zhou, Frede Blaabjerg

*Corresponding author for this work

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

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Abstract

This paper presents an assessment of the reliability of neutral point clamped (NPC) based photovoltaic (PV) systems using a mission profile. The study focuses on the two types of fragile components in these systems, namely the insulated-gate bipolar transistors (IGBTs) and the DC Al electrolytic capacitors. Additionally, the effects of power degradation due to the aging of PV panel and the over-temperature derating characteristics of the NPC inverter are considered to make the lifetime evaluation more realistic. The evaluation is demonstrated using a study case of a 225 kW PV system based on actual mission profile and commercial components. The study results indicate that careful consideration of these factors is crucial to improve the design and operation of NPC inveter-based PV systems. This paper provides valuable insights into the evaluation of the reliability of NPC inverter-based PV systems.

Original languageEnglish
Title of host publication2023 IEEE 14th International Symposium on Power Electronics for Distributed Generation Systems (PEDG)
Number of pages7
Publication date2023
Pages54-60
Article number10215265
ISBN (Electronic)9798350328233
DOIs
Publication statusPublished - 2023
Event14th IEEE International Symposium on Power Electronics for Distributed Generation Systems, PEDG 2023 - Shanghai, China
Duration: 9 Jun 202312 Jun 2023

Conference

Conference14th IEEE International Symposium on Power Electronics for Distributed Generation Systems, PEDG 2023
Country/TerritoryChina
CityShanghai
Period09/06/202312/06/2023
SeriesIEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG)
ISSN2329-5767

Keywords

  • PV systems
  • neutral point clamped inverter
  • over-temperature derating
  • power degradation
  • reliability

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