Test Report - solfex.co.uk · Company Huawei Technologies Co., ... 4.4 Overload test ... autotransformer has a deviation control of each phase which makes three phases

Test Report

Serial test

PV-Inverter

Company Huawei Technologies Co., Ltd. Inverter SUN2000-20KTL

08.05.2013

- 2 - PHOTON Laboratory GmbH Jülicherstrasse 376 52070 Aachen Germany T: +49-241-4003-5300 F: +49-241-4003-5700 www.photon.info [email protected]

Serial test PV-Inverter

Company Huawei Technologies Co., Ltd.

Inverter SUN2000-20KTL

Client: Huawei Technologies Co., Ltd. Order from: 30.8.2012 Date of issue: 6.5.2013 Number of report of total: 1/1 Number of pages report: 24 The results relate exclusively to the terms tested. This report may only be reproduced or published in full, without omissions, alterations or additions. The reproduction or publishing of extracts from this report require the written approval of the PHOTON Laboratory.

08.05.2013

PHOTON Laboratory GmbH - 3 -

Table of Content 1 Technical data of the inverter .............................................................................. 4 2 Testinstallation .................................................................................................... 8

2.1 Symmetrical and asymmetrical DC-loadcases ............................................. 8 2.2 Parallel DC-loadcase.................................................................................... 8 2.3 Used Devices and measurement equipment................................................ 9

3 Generell............................................................................................................... 9 4 Test Conditions ................................................................................................. 10

4.1 General ...................................................................................................... 10 4.2 Measurement of the Efficiency ................................................................... 10

4.2.1 Symmetrical DC-loadcase................................................................... 11 4.2.2 Asymmetrical DC-loadcase................................................................. 11 4.2.3 Parallel DC-loadcase .......................................................................... 11

4.3 Operation at higher ambient temperature................................................... 12 4.4 Overload test .............................................................................................. 12 4.5 Thermography test ..................................................................................... 12

5 Grading Photon Efficiency ................................................................................. 13 6 Test result efficiencies ....................................................................................... 14

6.1 Symmetrical DC-loadcase.......................................................................... 14 6.1.1 MPPT-Efficiency SummationTracker 1 – 3 ......................................... 14 6.1.2 Conversion efficiency .......................................................................... 15 6.1.3 Weighted conversion efficiency........................................................... 16 6.1.4 Overall-efficiency................................................................................. 17 6.1.5 Calculated overall efficiency at different MPP-voltages....................... 18

6.2 Asymmetrical DC-loadcase ........................................................................ 19 6.2.1 MPPT-Efficiency SummationTracker 1 – 3 ......................................... 19 6.2.2 Conversion efficiency .......................................................................... 19 6.2.3 Overall-efficiency................................................................................. 20

6.3 Parallel DC-loadcase.................................................................................. 20 6.3.1 MPPT-Efficiency.................................................................................. 20 6.3.2 Conversion efficiency .......................................................................... 21 6.3.3 Overall-efficiency................................................................................. 22

7 Grading PHOTON-efficiencies .......................................................................... 22 8 Other Test results .............................................................................................. 23

8.1 Temperature dependent conversion efficiency reduction ........................... 23 8.2 Overload test .............................................................................................. 23 8.3 Selfconsumption, Nightconsumption .......................................................... 23 8.4 Thermogram............................................................................................... 24

9 Others................................................................................................................ 25

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1 Technical data of the inverter General Manufacturer Huawei Technologies Co., Ltd. Device designation SUN2000-20KTL Serial number 210107136110CC000002 Y SUN2000 Firmware versions V100R001C00B028 Possible operating modes dc-sided

Independent, asymmetrical, parallel

Country settings DIN VDE 0126-1-1, (VDE-N-4105) DC side data Number of MPP Tracker 3 Nominal DC-Power 20600 W Max. DC-Power 22500 W / 12000W per Tracker Max. DC-Voltage 1000 V Min. DC-Voltage 200 V MPPT-Voltage-Range 480 – 800 V Max. Input Current 18 A / 3 x 18 A AC side data Nominal AC-Power 20000 W Number of Phases 3 Nominal Output Voltage 3x 230 V/400V + N + PE Max. AC-Current 3x 32 A

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Technical data (of Manufacturer)

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Construction State The construction state is defined as following: PC-Boards:

Powerboard 021PRU10CC000015 Y2 ENE1EMI1

Controlboard ENE10ET1 VER-C E204460 M1 94V-0 DC Switch SANTON

XA10016P6E-A C2012-06-13209 made in Europe

AC EMI Board E204460 D1 94V-0 4212 021PRX 10CB 000002 Y2 ENE1EMI3

AC Board 021PRS10CC000025Y2 ENE1PWR1 Cable 19-04090575-021850

1251

Display PC-Board 021TNR100B000046 Y2 ENE1MNT1

Film capacitors x3 C3D

1100VDC 40/85/56 30,0µF 10% C E256260 Film capacitors x3 C6A

10,0µF±10% 300VAC 40/85/21 SH

Firmware: V100R001C00B028 Bauteile: Chokes ? 1x Fan Model: DATA 1225B2X DC 12V 0,27A Temperaturclass of electrolyte Caps.: Powerelectronics: 105°C Controllboards: 105°C

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Name plate:

Displayed Software Version:

V100R001C00B028

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2 Testinstallation

2.1 Symmetrical and asymmetrical DC-loadcases Grid AC 3~ 230 V / 400 V

2.2 Parallel DC-loadcase Grid AC 3~ 230 V / 400 V

TC-Lin

Aut

otra

nsfo

rmer

Tracker

3

TC-Lin

TC-Lin

WR

WT3000 K1 K4K3K2

WT3000 K1 K4K3K2

Top Con

Top Con

Top Con

Tracker

1

Tracker

2

Tu To

DC DC

AC 3~

PT

PT

TC-Lin

Aut

otra

nsfo

rmer

Tracker

3

TC-Lin

TC-Lin

WR

WT3000 K1 K4K3K2

WT3000 K1 K4K3K2

Top Con

Top Con

Top Con

Tracker

1

Tracker

2

Tu To

DC DC

AC 3~

PT

PT

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2.3 Used Devices and measurement equipment Serial number remark DC-Simulation TopCon 1 0604CC286 SW: V4.20.55, BL: V0.21, PLD: V0.03 TopCon 2 0839CC767 SW: V4.20.55, BL: V0.21, PLD: V0.03 TopCon 3 0828CC718 SW: V4.20.55, BL: V0.21, PLD: V0.03 TC.Lin 1 1022LR026 - TC.Lin 2 0949LR008 - TC.Lin 3 0949LR006 - AC-supply Autotransformer 1120014-01 Möller-Preussler GmbH Powermeasurement Yokogawa WT 3000 (1) 91HB21393 - Yokogawa WT 3000 (2) 91F612365 - Signaltec MCTS Currenttransducer 200A Currenttransducer 200A Currenttransducer 200A Currenttransducer 200A Signalmeasurement Converter Phoenix 2002285244 MCR-PT100-U Converter Phoenix 2002285264 MCR-PT100-U Temperature Tu PTC Temperature To PTC NI6009 USB 142A09F

3 Generell Date of Test 3.5.2013 Testengineer Michael Jödicke

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4 Test Conditions Specification of the test according to the datasheet and to the agreement with the manufacturer. Grid Voltage 3x 230 V +/- 2% (L – N) Grid frequency 50 Hz Grid DC-Power, rated 20600 W maximum DC-Power per Tracker 12000 W maximum DC-Voltage 1000 V MPP-Voltage range at full load 480 – 800 V working DC-Voltage range 200 – 1000 V starting DC-Voltage ? V Anzahl MPP-Tracker 3 maximum MPP-Current / per String 3 x 18 A / 18 A maximum DC-Power of rated DC-Power 1,0 measured DC-Loadcases symmetrical, asymmetrical, parallel setting of DC-Loadcases Automatic by software Remarks Capacitors at DC-Inputs of inverter, 30 µF

per MPPT

4.1 General The ambient temperature keeps at 25 degree Celsius during the efficiency test. A cooling and heating system have been installed in the test room. The cooling system is supplied by thin layers with a heating exchanger under the ceiling without ventilation, the heater is heating by resistors without ventilation, either. Two PT100 sensors have been mounted at the upper and lower points of the device under test. The measurement devices are currently not connected with a grid simulator. An autotransformer is connected between the inverter and grid. It is balancing the grid voltage fluctuation and the uplifting of the gridvoltage by the inverter. The autotransformer has a deviation control of each phase which makes three phases toroidal transformers drive independently. The control works with a delay of seconds.

4.2 Measurement of the Efficiency Measurement takes places at 20 different voltage steps by dividing the input voltage provided by the manufacturer into appropriate segments. Furthermore, the power range is divided into steps of 5 percent, thus with a power range from 5 to 120 percent, there are 24 steps. This results in a pattern of 20 x 24, that means 480 measurement points with the fill factor of 75 percents. In the beginning of the test, the inverter needs to warm up for 10 minutes at rated Power and minimum MPP voltage (IV-curve No.20). The efficiency measurement performs in all voltage blocks and it starts with the smallest value. In addition, the inverter works with power capacities from 5 percents to 120 percents of the rated

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power with 5 percent for each increment. Therefore, the 24 operating points from a voltage block needed to be loaded into the simulator in advance and the measurement starts afterwards. Before a measurement begins, the inverter is given 300 seconds to let the inverter connected to the grid, then 60 seconds is given to find an IV-curve’s MPP point (Maximum Power Point). With the help of the power analyzer Yokogawa WT3000, every measurement precisely documents what which energy enters and exits the inverter. The analyzer simulation seriously measures voltage and current in the inverters input and output and then calculates all data. The measurement time is 100 seconds and for each second two measurement datasets are recorded. Therefore the power analyzer samples with 200000 samples per second, every measuring point exist out of 100000 samples. The 200 measurement points are calculated to one averaged point. After each powerstep of one voltage block has been tested, the output of the PV-simulator will be switched off and the IV-curves will be deleted from the PV simulator. Then the next 24 IV-curves will be loaded into the simulator and the simulation starts again with the waiting time of 300 seconds with the next MPP-voltage one step higher. The same procedure is repeated for 20 times for in total 480 measurement points. The voltage, current and active power are logged from each MPP-tracker input. For each to the inverter connected gridphase the voltage, current, active power, efficiency, power factor and phase angles will be logged correlated with the actual time. The data logging is recorded with two synchronized power analyzers of Yokogawa WT3000.

4.2.1 Symmetrical DC-loadcase

PDC,r Tracker 1 [W] 6867 MPP-Voltage range Tracker 1 [V] 480 – 800 PDC,r Tracker 2 [W] 6867 MPP-Voltage range Tracker 2 [V] 480 – 800 PDC,r Tracker 3 [W] 6867 MPP-Voltage range Tracker 3 [V] 480 – 800

4.2.2 Asymmetrical DC-loadcase

PDC,r Tracker 1 [W] 12000 MPP-Voltage range Tracker 1 [V] 667 – 800 PDC,r Tracker 2 [W] 3200 MPP-Voltage range Tracker 2 [V] 300 – 800 PDC,r Tracker 3 [W] 5400 MPP-Voltage range Tracker 3 [V] 300 – 800

4.2.3 Parallel DC-loadcase

PDC,r [W] 20600 MPP-Voltage range [V] 480 - 800

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4.3 Operation at higher ambient temperature The test operates with rated power at the medium MPP-Voltage range at an ambient temperature of 25 degree Celsius. After the measurement starts, 20 measurement points are collected in the beginning of the test and will be averaged to the conversion efficiency at start up. Then the room temperature will be raised up until the inverter derates the point or the highest allowed ambient temperature of the test room (60 degree Celsius) is reached. Then the 20 measurement points before power reduction will be taken and averaged again. The difference in conversion efficiency between this two averaged points is the temperature dependent conversion efficiency reduction, given in percent. During this test all dc- and ac-sided values and the two temperatures at the top and the bottom of the inverter, measured by two PT100 sensors, are logged every 0.5 seconds. The whole measurement takes about 2 hours. If the temperature dependent conversion efficiency reduction is high, the gradation of the inverter will be reduced by one grade lower. PDC,r Tracker 1 [W] 6867 VMPP Tracker 1 [V] 632 PDC,r Tracker 2 [W] 6867 VMPP Tracker 1 [V] 632 PDC,r Tracker 3 [W] 6867 VMPP Tracker 1 [V] 632

4.4 Overload test The overload test performs in the medium range of nominal DC voltage range and at 130% of DC rated input power. The inverter is operating at an ambient temperature of 25°C within the duration of 2 hours. The data-logging is done for every second by a Labview application. It is important to check the inverter behaviors in the beginning, middle and end of the test, also to observe if a power reduction has been occurred in between or in the end of the measurement period. When power limitation takes an effect, the inverter changes the operating point on the IV-curve towards higher input voltages. At the end of the test the last 20 measured values will be used for calculating the averaged values. PDC, MPP Tracker 1 [W] 8927 VMPP Tracker 1 [V] 632 PDC, MPP Tracker 2 [W] 8927 VMPP Tracker 1 [V] 632 PDC, MPP Tracker 3 [W] 8927 VMPP Tracker 1 [V] 632

4.5 Thermography test The thermography picture illustrates temperature hotspots within an inverter which indicates the long term performance of an inverter. The test is operated with rated power (IV-curve no. 236) with an ambient temperature of 25 degree Centigrade with a duration of 90 minutes. In the end of the test, the inverter cover is taken off immediately for taking a thermogram, i.e. the picture is taken within a few seconds. Once should be noted that the temperature is taken only of directly visible components. The type camera is an IR infrared thermographic camera (Brand/Model

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name: FLUKE/Ti20 thermal Imager) and emission ration (ε) is fixed to 0.95. In the end two maximum hotspots will be marked. PDC,r Tracker 1 [W] 6867 VMPP Tracker 1 [V] 632 PDC,r Tracker 2 [W] 6867 VMPP Tracker 1 [V] 632 PDC,r Tracker 3 [W] 6867 VMPP Tracker 1 [V] 632

5 Grading Photon Efficiency

A++ A+ A B C D F European or Californian weighted average overall efficiency

≥ 99

98 - < 99

96,5 - < 98

95 - < 96,5

93,5 - < 95

92 - < 93,5

< 92

Deviation from next worse grade

0,5

1,0

1,5

1,5

1,5

1,5

-

Effect of temperature on Conversion efficiency The efficiency differential is provided between η at 25°C and η at the maximum temperature without power reduction, measured at a nominal power PDCN and a voltage VDC in the middle of the MPP-Voltage range. The grade for weighted average overall efficiency can be reduced through the conversion efficiency’s temperature interdependency. If the value of efficiency reduction reaches or exceeds the amount of difference to the next lower grade level, the grade drops to this lower level. The overall grade is mentioned with numerical values for medium and high irradiation. In the gradingtable the nomination of the grade will be done with the numerical value of the PHOTON efficiency. Comments and ancillary conditions: The grade for weighted average overall efficiency is insufficient when the inverter’s efficiency is so poor that it wipes out its own monetary value. This value is set at a weighted average overall efficiency of 92 percent. Additional aspects of the grading system: Noticeable problems and safety aspects are included in the grading process and can result in a lower grade. The inverters will be eliminated from the grading process if they do not fulfill the specifications provided by their manufacturers.

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6 Test result efficiencies Measuring datas look at attached excelfiles

6.1 Symmetrical DC-loadcase

6.1.1 MPPT-Efficiency SummationTracker 1 – 3

Fig. 1: summation of calculated MPP-efficiency related to the rated MPP-power and MPP-voltage

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6.1.2 Conversion efficiency

Fig. 2: measured conversion efficiency related to the rated MPP-power and MPP-voltage

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6.1.3 Weighted conversion efficiency

Fig. 3: weighted conversion efficiency related to the MPP-voltage

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6.1.4 Overall-efficiency

Fig. 4: calculated overall efficiency related to the rated MPP-power and MPP-voltage

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6.1.5 Calculated overall efficiency at different MPP-voltages

Fig. 5: calculated overall efficiency at different MPP-voltages related to the rated MPP-power

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6.2 Asymmetrical DC-loadcase

6.2.1 MPPT-Efficiency SummationTracker 1 – 3

Fig. 6: calculated MPP-efficiency related to the rated MPP-power and MPP-voltage



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6.3 Parallel DC-loadcase

6.3.1 MPPT-Efficiency

Fig. 9: measured MPP-efficiency related to the rated MPP-power and MPP-voltage

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7 Grading PHOTON-efficiencies The results of the inverter Huawei SUN2000-20KTL will be European weighted average overall efficiency: value: 98,0%; grade A+. Temperature dependent reduction of the conversion efficiency by minus 0,18% - the grade persists in A+. Californian weighted average overall efficiency: value 98,1%; grade A+. Temperature dependent reduction of the conversion efficiency by minus 0,18% - the grade persists in A+.

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8 Other Test results

8.1 Temperature dependent conversion efficiency reduction

date time efficiency Pdc1/KW Pdc2/KW Pdc3/KW To/°C Tu/°C Vmpp1/V Vmpp2/V Vmpp3/V26.02.13 9:11 98,32 6877,74 6867,93 6871,75 25,94 25,14 630,97 631,17 631,11 26.02.13 10:45 98,15 6879,71 6868,31 6870,86 61,46 59,18 630,16 630,35 630,29 maximum reduction of conversion efficiency in %: 0,18 reduction of power at in °C 59,2 temperature range during test in °C 25,1 – 59,2

8.2 Overload test MPPT1 MPPT2 MPPT3 L1 L2 L3 Sum in W Overload in %Vdc in V 697,6 697,8 697,7 Pdc in W 7509,5 7443,3 7452,9 22405,7 8,8 Pac in W 7317,8 7296,8 7362,7 21977,2 Tu in °C: 24,0 Start of test: 08:16 End of test: 10:24

8.3 Selfconsumption, Nightconsumption Selfconsumption AC-Side connected and provided DC-Side connected and provided with Vdc = 765V

MPPT1 MPPT2 MPPT3 Pdcsum Pdc in W 21,5 0 0,4 21,90

L1 L2 L3 Pacsum

Pac in W -0,15 -0,25 -0,40 -0,80 Nightconsumption AC-Side connected and provided DC-Side connected and not provided, Vdc = 0V

L1 L2 L3 Pacsum Pac in W -0,20 -0,25 -0,45 -0,90

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8.4 Thermogram

Fig. 12: thermogram

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9 Others This testreport includes 24 pages.

Signature Date

Test engineer Michael Jödicke

7.5.2013

Head of Testlaboratory Heinz Neuenstein

7.5.2013

Documents

Test Report - solfex.co.uk · Company Huawei Technologies Co., ... 4.4 Overload test ... autotransformer has a deviation control of each phase which makes three phases