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Title: Effects of Reactive Power on Photovoltaic Inverter Reliability and Lifetime

Abstract

For predicting the reliability and lifetime of Photovoltaic (PV) inverters, thermal cycling is considered the most important stressors in the inverter system. To realize this, a detailed electrothermal model of the PV inverter was developed along with the controllers. The model was verified by developing an in-house inverter, which was placed inside a thermal chamber to verify the losses and temperature rise within the system at various temperatures. After the verification of the model, a reduced order model of the inverter was implemented which can translate the mission profile of ambient temperature and solar irradiance into load profile of junction temperatures of the switches. The estimated junction temperature data was used to identify the reliability indices and predict the useful lifetime of the inverter system. After developing the models to predict useful lifetime of the system, the impact of reactive power on the overall reliability of the system was studied. Experiments show that lifetime and reliability of the inverter decreases as the operating power factor decreases from unity. The results are presented and discussed here.

Authors:
 [1];  [1];  [1];  [1]
  1. National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S)
OSTI Identifier:
1531337
Report Number(s):
NREL/PO-5D00-74155
DOE Contract Number:  
AC36-08GO28308
Resource Type:
Conference
Resource Relation:
Conference: Presented at the IEEE 46th Photovoltaic Specialist Conference (PVSC), 16-21 June 2019, Chicago, Illinois
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 24 POWER TRANSMISSION AND DISTRIBUTION; inverter reliability; lifetime estimation; thermal model; loss model; rain flow counting

Citation Formats

Thiagarajan, Ramanathan, Nagarajan, Adarsh, Hacke, Peter L, and Repins, Ingrid L. Effects of Reactive Power on Photovoltaic Inverter Reliability and Lifetime. United States: N. p., 2019. Web.
Thiagarajan, Ramanathan, Nagarajan, Adarsh, Hacke, Peter L, & Repins, Ingrid L. Effects of Reactive Power on Photovoltaic Inverter Reliability and Lifetime. United States.
Thiagarajan, Ramanathan, Nagarajan, Adarsh, Hacke, Peter L, and Repins, Ingrid L. Mon . "Effects of Reactive Power on Photovoltaic Inverter Reliability and Lifetime". United States. https://www.osti.gov/servlets/purl/1531337.
@article{osti_1531337,
title = {Effects of Reactive Power on Photovoltaic Inverter Reliability and Lifetime},
author = {Thiagarajan, Ramanathan and Nagarajan, Adarsh and Hacke, Peter L and Repins, Ingrid L},
abstractNote = {For predicting the reliability and lifetime of Photovoltaic (PV) inverters, thermal cycling is considered the most important stressors in the inverter system. To realize this, a detailed electrothermal model of the PV inverter was developed along with the controllers. The model was verified by developing an in-house inverter, which was placed inside a thermal chamber to verify the losses and temperature rise within the system at various temperatures. After the verification of the model, a reduced order model of the inverter was implemented which can translate the mission profile of ambient temperature and solar irradiance into load profile of junction temperatures of the switches. The estimated junction temperature data was used to identify the reliability indices and predict the useful lifetime of the inverter system. After developing the models to predict useful lifetime of the system, the impact of reactive power on the overall reliability of the system was studied. Experiments show that lifetime and reliability of the inverter decreases as the operating power factor decreases from unity. The results are presented and discussed here.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {7}
}

Conference:
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