sample of report & snail trail defect
TRANSCRIPT
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Sample of Maharastra Site Snail Trail Modules performance Data Report By: Shiv Verma
Design Vs Actual Generation:-
Aprl May June July Aug Sep010002000300040005000600070008000
50.%60.%70.%80.%90.%100.%110.%120.%
Desaign vs Actual vs targeted Generation, 37.5MW DC
Design Gen. MWh Actual Export. MWh % Gain Degn Vs Actual Taget for FY-2015-16Month
Gene
ratio
n in
MW
Gen
Desig
n vs
Act
ual i
n %
Net PR and CUF of PLANT: -
Jan Feb. Mar Apr May June July Aug Sept.0.0%10.0%20.0%30.0%40.0%50.0%60.0%70.0%80.0%90.0%
100.0%CUF & PR of Plant 37.5 MW DC, Maharashtra Site
Per
cent
age
37.5MW DC (32MW AC)_CUF & PR in % Maharashtra DataMonth Design CUF in % Actual CUF in % Design PR in % Actual PR in % Inv. PR in %
Jan 17.4% 18.2% 75.37% 75.2% 76.63%Feb. 17.9% 20.9% 73.71% 77.8% 79.32%Mar 18.8% 20.8% 72.46% 80.6% 81.93%Apr 21.4% 21.6% 70.30% 78.5% 80.16%May 20.9% 20.5% 71.72% 81.9% 83.75%June 16.9% 17.1% 74.82% 87.0% 88.91%July 13.9% 15.5% 75.51% 84.3% 86.14%Aug 14.2% 15.4% 75.21% 84.3% 86.33%
Sept. 17.1% 17.3% 75.04% 81.9% 83.76%
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Plant & Grid Availability :-
Jan Feb. Mar April May June July Aug Sep0
100
200
300
400
500
600
95.50096.00096.50097.00097.50098.00098.50099.00099.500100.000100.500
Inverter Down Time (Minute) Grid Down Time (Minute) Grid Gen Loss (MWh)INV Gen Loss (MWh) Plant Availability in % Grid Availibility in %
37.5MW DC Plant Availability Vs Grid & Plant Down Time
Tim
e in
Min
ute
Avai
labi
lity
in %
37.5MW DC (32MW AC) Grid & Plant Down Time, Plant & Grid Availability and Contribution of Losses Mont
hInverter Down Time (Minute)
Grid Down Time (Minute)
Plant Availability in %
Grid Availability in %
Grid Gen Loss (MWh)
INV Gen Loss (MWh)
String Ground Fault Loss in MW
Jan 120 564 99.412 97.235 120.2 40.0 Feb. 25 138 99.870 99.284 33.0 4.12 Mar 6 60 99.971 99.729 3.8 1.8 April 0 0 100.000 100.000 0 0 0May 5.6 60 99.975 99.729 0 0.69 0June 35.6 135 99.835 99.375 30.63 5.508 0.34July 94.0 226 99.565 98.954 12.61 39.27 0.05Aug 19.3 0 99.911 100.000 0.00 2.78 0.01Sep 5.6 06:00 99.974 99.999 3.08 0.79 1.13
Jan Feb Mar Apr May June July Aug Sep0.01000.02000.03000.04000.05000.06000.07000.0
0.0%0.5%1.0%1.5%2.0%2.5%
37.5MW DC (32MW AC) HT Transmission Losses w.r.t. Inv. Gen.
Gene
ratio
n in
MW
h
Gen
Loss
in %
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Generation Loses due to Breakdown:- Jul Main contactor fault
11%Jul DI 4 Fault
3%Aug Earth fault
13%
Sep DC Switch Break Posi-tion5%
Sep Main contac-tor fault
69%
14MW Major faults distribution
13% 2%1%
44%
41%
36MW String Ground Faults
June String Ground Fault
July String Ground Fault
August String Ground Fault
September String Ground Fault
September Inv start delay due to Ground Fault
Generation of 14 MW:-
April May June July Aug Sep0.0
500000.0
1000000.0
1500000.0
2000000.0
0%
5%
10%
15%
20%14MW DC(13MWAC) Generation Vs Actual CUF Vs Targeted
CUF in %
Gene
ratio
n in
KW
h
CUF i
n %
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Rout-cause Analysis:-
Some strings / modules observed underperformance as per contract specification (modules showing under performance up to 40%) as per attached photograph 1,2,3 & 4, String No 1.
Block 8, S1 S1M15
Nmod Pmax Voc Vmpp Impp Isc Irradiance Module Temp FF Temp
. alpha beta tol+ tol-
Measures@OPC 1 166.12 38.4 30.1 5.52 6.77 851 76.8 64 Auto 0.046 -0.3 3 0
Meas Avg@OPC 1 166.12 38.4 30.1 5.52 6.77 851 76.8 64 Auto 0.046 -0.3 3 0
STC 1 235.96 45.4 36.6 6.45 7.59 1000 25 68 Auto 0.046 -0.3 3 0
Nominal 1 305 45.4 37 8.25 8.75 1000 25 77 Auto 0.046 -0.3 3 0TSM-305 Dt. 10/10/2015 13:19:00 Not Ok (-
22.64%)
1 2
3 4
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Defect in Modules:-
Snail trail:- Snail Trail (Snail rail) basically micro cracks in solar cell during encapsulation of EVA and lamination, sometimes cracks increase and seems visible on modules. If cracks increase horizontal to the grid line the impact is very less but if its vertical then impact on module will be high. Voc of snail trail defect modules are same, we can identify performance with PV-IV curve characteristic only.
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I
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 300
50
100
150
200
250
300
350
012345678910
6.0
4.85.95.6
5.9
4.94.94.4
3.1
4.84.85.6
4.44.03.7 4.14.3
1.3
6.66.05.4
4.9
6.06.26.86.97.26.6
5.96.1
Power Generation (Exp &Imp) v/s Irradiance & Module clean-ing Sep'15
Daily Gen. MW Module Cleaning in thousand Irradiance averageEnergy Import In MWh
Date
Powe
r Gen
ratio
n in
MW
Irrad
iatio
n in
KW
h/m
2
Cloudy Weather and Rain
Thanks & RegardsShiv Kumar Verma+91 9971772141