The photovoltaic (PV) modules are in PV arrays normally connected in series and thus some of them are exposed to high system voltages since frames of the PV modules are grounded. To predict the long-term PV system energy output and PV module lifetime, it is very important to understand and take into account the degradation process of PV modules under high-voltage stress. Accelerated tests under damp heat (over 1300 h of DH85/60; RH = 85%, T = 60 °C) of in-house developed monocrystalline silicon PV modules with p-type solar cells were preformed while connected to a positive or negative voltage bias of 1000 V. The negative biased modules exhibited just a little degradation, while the positive biased modules degraded rapidly. We identified three degradation mechanisms: cell degradation, silver corrosion, and EVA evaporation. The degradation mechanisms contribute to almost 15% of the performance loss of the 1000 V positive biased modules after more than 1300 h of DH85/60 testing, while the power degradation of the negative biased modules remains below 3%.

References

References
1.
Pingel
,
S.
,
Frank
,
O.
,
Winkler
,
M.
,
Daryan
,
S.
,
Geipel
,
T.
,
Hoehne
,
H.
, and
Berghold
,
J.
,
2010
, “
Potential Induced Degradation of Solar Cells and Panels
,”
35th IEEE Photovoltaic Specialists Conference (PVSC)
, pp.
2817
2822
.
2.
AE Solar Energy, 2013, “
Understanding Potential Induced Degradation
,” Advanced Energy Industries, Bend, OR, Paper No. ENG-PID-270-01, accessed Mar. 8, 2017, http://solarenergy.advanced-energy.com/upload/File/White_Papers/ENG-PID-270-01%20web.pdf
3.
Swanson
,
R.
,
Cudzinovic
,
M.
,
DeCeuster
,
D.
,
Desai
,
V.
,
Jürgens
,
J.
,
Kaminar
,
N.
,
Mulligan
,
W.
,
Rodrigues-Barbarosa
,
L.
,
Rose
,
D.
,
Smith
,
D.
,
Terao
,
A.
, and
Wilson
,
K.
,
2005
, “
The Surface Polarization Effect in High-Efficiency Silicon Solar Cells
,”
15th International Photovoltaic Science and Engineering Conference
, pp. 410–411.
4.
del Cueto
,
J. A.
, and
McMahon
,
T. J.
,
2002
, “
Analysis of Leakage Currents in Photovoltaic Modules Under High-Voltage Bias in the Field
,”
Prog. Photovoltaics
,
10
(
1
), pp.
15
28
.
5.
Liu
,
H. C.
,
Huang
,
C. T.
,
Lee
,
W. K.
, and
Lin
,
M. H.
,
2013
, “
High Voltage Stress Impact on P Type Crystalline Silicon PV Module
,”
Energy Power Eng.
,
5
(
7
), pp.
455
458
.
6.
Dhere
,
N. G.
,
Shiradkar
,
N. S.
, and
Schneller
,
E.
,
2014
, “
Evolution of Leakage Current Paths in MC-Si PV Modules From Leading Manufacturers Undergoing High-Voltage Bias Testing
,”
IEEE J. Photovoltaics
,
4
(
2
), pp.
654
658
.
7.
del Cueto
,
J. A.
, and
Rummel
,
S. R.
,
2010
, “
Degradation of Photovoltaic Modules Under High Voltage Stress in the Field
,”
Proc. SPIE
,
7773
, p.
77730J
.
8.
Hacke
,
P.
, and
Nederland
,
S. E. C.
,
2010
, “
Characterization of Multicrystalline Silicon Modules With System Bias Voltage Applied in Damp Heat
,”
25th European Photovoltaic Solar Energy Conference and Exhibition
, pp. 3760–3765.
9.
Xiong
,
Z.
,
Walsh
,
T. M.
, and
Aberle
,
A. G.
,
2011
, “
PV Module Durability Testing Under High Voltage Biased Damp Heat Conditions
,”
Energy Procedia
,
8
, pp.
384
389
.
10.
Bauer
,
J.
,
Naumann
,
V.
,
Großer
,
S.
,
Hagendorf
,
C.
,
Schütze
,
M.
, and
Breitenstein
,
O.
,
2012
, “
On the Mechanism of Potential-Induced Degradation in Crystalline Silicon Solar Cells
,”
Phys. Status Solidi
,
6
(
8
), pp.
331
333
.
11.
Naumann
,
V.
,
Lausch
,
D.
,
Hähnel
,
A.
,
Bauer
,
J.
,
Breitenstein
,
O.
,
Graff
,
A.
, and
Werner
,
M.
,
2014
, “
Explanation of Potential-Induced Degradation of the Shunting Type by Na Decoration of Stacking Faults in Si Solar Cells
,”
Sol. Energy Mater. Sol. Cells
,
120
(Pt. A.), pp.
383
389
.
12.
SMA
, “
PV Offset Box
,” SMA Solar Technology, Germany, accessed Jan. 31, 2017, http://files.sma.de/dl/15437/PVOFFSETBOX-DEN1444-V10web.pdf
13.
IEC
, 2013, “
System Voltage Durability Qualification Test for Crystalline Silicon Modules
,” International Electrotechnical Commission, Geneva, Switzerland, Standard No. IEC-62804.
14.
LPVO, 2011, “
LPVO: Datalogger
,” Faculty of Electrical Engineering, Laboratory of Photovoltaic and Optoelectronics, accessed Jan. 31, 2017, http://lpvo.fe.uni-lj.si/en/services/prototype-development/datalogger/
15.
IEC
, 2005, “
Crystalline Silicon Terrestrial Photovoltaic (PV) Modules—Design Qualification and Type Approval
,” International Electrotechnical Commission, Geneva, Switzerland, Standard No. IEC-61215 Ed2.
16.
Mon
,
G. R.
, and
Ross
,
R. G.
,
1985
, “
Electrochemical Degradation of Amorphous-Silicon Photovoltaic Modules
,”
18th IEEE PVSC
, Las Vegas, NV, p.
1142
.
17.
Mon
,
G. R.
,
Wen
,
L.
,
Ross
,
R. G.
, and
Adent
,
D.
,
1985
, “
Effects of Temperature and Moisture on Module Leakage Currents
,”
18th IEEE PVSC
, Las Vegas, NV, pp.
1179
1185
.
18.
Jankovec
,
M.
,
Galliano
,
F.
,
Annigoni
,
E.
,
Li
,
H. Y.
,
Sculati-Meillaud
,
F.
,
Perret-Aebi
,
L. E.
,
Ballif
,
C.
, and
Topič
,
M.
,
2016
, “
In-Situ Monitoring of Moisture Ingress in PV Modules Using Digital Humidity Sensors
,”
IEEE J. Photovoltaics
,
6
(
5
), pp.
1152
1159
.
19.
Kempe
,
M. D.
,
Jorgensen
,
G. J.
,
Terwilliger
,
K. M.
,
McMahon
,
T. J.
,
Kennedy
,
C. E.
, and
Borek
,
T. T.
,
1989
, “
Potential Problems With Ethylene-Vinyl Acetate for Photovoltaic Packaging
,”
Electrochem. Soc.
,
136
(
4
), pp.
204
212
.
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