NDLI: Instantaneous thermal modeling of the DC-link capacitor in PhotoVoltaic systems

Content Provider	IEEE Xplore Digital Library
Author	Yongheng Yang Ke Ma Huai Wang Blaabjerg, F.
Copyright Year	2015
Description	Author affiliation: Dept. of Energy Technol., Aalborg Univ., Aalborg, Denmark (Yongheng Yang; Ke Ma; Huai Wang; Blaabjerg, F.)
Abstract	Capacitors have been witnessed as one of the weak points in grid-connected photovoltaic (PV) applications, and thus efforts have been devoted to the design of reliable DC-link capacitors in PV applications. Since the hot-spot temperature of the capacitor is one of the failure inducers, instantaneous thermal modeling approaches considering mission profiles for the DC-link capacitor in single-phase PV systems are explored in this paper. These thermal modelling approaches are based on: a) fast Fourier transform, b) look-up tables, and c) ripple current reconstruction. Moreover, the thermal modelling approaches for the DC-link capacitors take into account the instantaneous thermal characteristics, which are more challenging to the capacitor reliability during operation. Such instantaneous thermal modeling approaches enable a translation of instantaneous capacitor power losses to capacitor thermal loading from the operating conditions. As a consequence, it offers new insights into the temperature monitoring and reliability-oriented design of the DC-link capacitors, and thus a more reliable operation of single-phase grid-connected PV systems can be enhanced. Study results on a 3-kW single-phase grid-connected PV system have been adopted to demonstrate a look-up table based modelling approach, where real-field daily ambient conditions are considered.
Starting Page	2733
Ending Page	2739
File Size	1103760
Page Count	7
File Format	PDF
ISBN	9781479967353
DOI	10.1109/APEC.2015.7104737
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-03-15
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Capacitors Monitoring Temperature measurement Frequency measurement Table lookup Reliability Inverters
Content Type	Text
Resource Type	Article

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