电容器
光伏系统
可靠性(半导体)
涟漪
电解电容器
计算机科学
电气工程
网格
热的
电子工程
工程类
功率(物理)
电压
物理
量子力学
数学
几何学
气象学
作者
Yongheng Yang,Ke Ma,Huai Wang,Frede Blaabjerg
标识
DOI:10.1109/apec.2015.7104737
摘要
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.
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