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Grid operation experiences have revealed the necessity to limit the maximum feed-in power from PV inverter systems under a high penetration scenario in order to avoid voltage and frequency instability issues. A Constant Power Generation (CPG) control method has been proposed at the inverter level. The CPG control strategy is activated only when the DC input power from PV panels exceeds a specific power limit. It enables to limit the maximum feed-in power to the electric grids and also to improve the utilization of PV inverters. As a further study, this paper investigates the reliability performance of the power devices (e.g. IGBTs) used in PV inverters with the CPG control under different feed-in power limits. A long-term mission profile (i.e. solar irradiance and ambient temperature) based stress analysis approach is extended and applied to obtain the yearly electrical and thermal stresses of the power devices, allowing a quantitative prediction of the power device lifetime. A study case on a 3 kW single-phase PV inverter has demonstrated the advantages of the CPG control in terms of improved reliability.
|Title of host publication||Proceedings of the 2014 IEEE Energy Conversion Congress and Exposition (ECCE)|
|Number of pages||8|
|Publication date||Sep 2014|
|Publication status||Published - Sep 2014|
|Event||2014 IEEE Energy Conversion Congress and Exposition (ECCE) - Pittsburgh, Pittsburgh, United States|
Duration: 14 Sep 2014 → 18 Sep 2014
|Conference||2014 IEEE Energy Conversion Congress and Exposition (ECCE)|
|Period||14/09/2014 → 18/09/2014|
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- 2 Finished
01/01/2013 → 31/12/2014
- 1 Conference presentations