UL RENEWABLES
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Presentation RE_India19-19
Testing and Certification procedure for distributed power
generating units according to the new CEA Regulation for
grid connectivity in India
Nivedh BS (UL India Private Ltd) Presenting author
Co-authors
Sokratis Tentzerakis, Jens Dirksen, Fritz Santjer (UL International GmbH)
Guido Broering, Saptarshi Chatterjee, Phubade Pasakawee (DEWI-OCC Offshore and Certification Centre GmbH)
2nd INTERNATIONAL CONFERENCE ON
Large-Scale Grid Integration of Renewable Energy in India
4 – 6 September 2019
New Delhi, INDIA
WHO WE ARE
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UL is one of the leading international testing and certification, providers in renewable energy
UL provides Low Voltage Ride Through (LVRT) and Overvoltage Ride Through (OVRT)
testing & measurement services for wind, solar, CHPs and other power generating units
ISO/IEC 17025 accreditation for measurements according to the following
standards/guidelines
IEC 61400-21-
1, Ed.1 (2019)
IEC 61400-21-
1, Ed.1 (2019)
IEEE
519
IEEE
519
MEASNETMEASNET
FGW TR3
& TR8
FGW TR3
& TR8
Spanish
Guideline
Spanish
Guideline
Italy CEI 0-
16, 0-21
Italy CEI 0-
16, 0-21ENTSOEENTSOE
VDE V
0124-100
VDE V
0124-100
VDE AR
N 4120
VDE AR
N 4120
International
Standards/Guidelines
International
Standards/GuidelinesNational
Guidelines/Procedures
National
Guidelines/Procedures
UK G99UK G99
CENELEC
50549-10
CENELEC
50549-10
Indian Grid
Code (CEA)
Indian Grid
Code (CEA)
+ Grid Codes of other countries
New IEC 61400-21-1
published in May 2019
New IEC 61400-21-1
published in May 2019
CURRENT STATUS WORLDWIDE
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UL and the UL logo are trademarks of UL LLC © 2017. Proprietary & Confidential.
International
Standards/Guidelines
International
Standards/Guidelines
National
Procedures/Guidelines
National
Procedures/GuidelinesGermany
FGW TR3 (Testing)
FGW TR8 (Certification)
Germany
FGW TR3 (Testing)
FGW TR8 (Certification)
UK
ENA Engineering
Recommendation
G99
UK
ENA Engineering
Recommendation
G99
Spain
AEE: Procedure for
certification of wind and
PV farms for LVRT
Spain
AEE: Procedure for
certification of wind and
PV farms for LVRT
In countries where no
special testing procedure
exists, the general rule is to
use IEC 61400-21-1 as a
guide
In countries where no
special testing procedure
exists, the general rule is to
use IEC 61400-21-1 as a
guide
China
• GB/T 36995-2018 (Voltage
Fault Ride Through)
• GB/T 20320-2013 / IEC
61400-21, 2008 (PQ)
China
• GB/T 36995-2018 (Voltage
Fault Ride Through)
• GB/T 20320-2013 / IEC
61400-21, 2008 (PQ)
European Commision
European Network Code for
Connection of Generators
(RfG)
European Commision
European Network Code for
Connection of Generators
(RfG)
US
IEEE 1547.1, IEEE
519
US
IEEE 1547.1, IEEE
519
IndiaTechnical Standards for
Connectivity to the Grid
Regulations 2007 /
Amendment Regulations
2013 & 2019
IndiaTechnical Standards for
Connectivity to the Grid
Regulations 2007 /
Amendment Regulations
2013 & 2019
CENTRAL ELECTRICITY AUTHORITY REQUIREMENTS OVERVIEW
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AreasAreas
Power
Quality
Power
Quality
Fault Ride
Through
Fault Ride
Through
ControlControl
Grid
Protection
Grid
Protection
Power Quality (Normal Operation)
Harmonics acc. to IEEE 519
Flicker acc. to IEC 61000 (TR 61000-3-7)
DC current injection ≤ 0.5% of rated
Control Capability
Power factor within the limits of 0.95 lagging and
0.95 leading
Operational frequency range
Set-point control of active power
Active power ramp rate limitation
Frequency Droop (3-6%)
Primary Frequency Response (Synthetic Inertia)
Fault Ride Through
Low voltage ride through (LVRT):
- Supply of reactive power (1st priority)
- Supply of active power (2nd priority)
- Active power recovery after fault clearance ≤ 1s
Overvoltage ride through (LVRT):
- Remain connected
Grid protection
Reliable fault detection
20192019
20192019
20192019
20192019
20192019New CEA Regulation 2019 applies
to all units and voltage levels
TEST PROCEDURE FOR POWER QUALITY
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A. Flicker
Measurement and evaluation according to IEC 61400-21-1, Ed.1 (2019)
No substantial changes in the procedure followed up to now
Pbin
[% of Pn]
k [°] 0 10 20 30 40 50 60 70 80 90 100 Max.
30°
50°
70°
85°
Remark
New edition of IEC facilitates measurement campaings because it is not required to
measure for wind speeds up to 15 m/s as in the previous IEC 61400-21, Ed.2 (2008)
TEST PROCEDURE FOR POWER QUALITY
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B. Harmonics
Measurement and evaluation according to IEC 61400-21-1, Ed.1 (2019)
Evaluation according to IEEE 519
No changes in the procedure followed up to now
Harmonic evaluation parameters
Averaging time 10 min / 3s
Number of measurements ≥ 7 for each 10 % power bin
Measured parameter Current and voltage
Aggregation method Geometric
Harmonic frequencies Integer harmonics up to 50th order
Statistical assessment 95th and 99th percentiles
TEST PROCEDURE FOR POWER QUALITY
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C. DC Current Injection
Measurement and evaluation according to IEEE 1547.1
No changes in the procedure followed up to now
DC Current Injection parameters
Averaging time ≥ 5 min
Number of
measurements
At least one at 33%, 66% and > 90% of Pn (sorting in
10% power bins can be applied (30%, 70%, 100% bin))
Harmonic frequencies 0 Hz
Instrumentation Suitable DC Current clamps to be used
DC Current injection measurement not mandatory in case a built-in transformer is
included in the Type Certificate (mainly for WTs)
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TEST PROCEDURE FOR FAULT RIDE THROUGH
20192019
20192019
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Testing procedure
Two power levels (Partial and Full
Load)
Two and Three phase faults
Single phase faults raise safety
issues and are not recommended
Two consecutive tests per case
No load test for each fault type to be
performed closely to the faults
under load
TEST PROCEDURE FOR FAULT RIDE THROUGH
TEST PROCEDURE FOR CONTROL CAPABILITY AND GRID PROTECTION
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Control parameter CEA 2019 requirement Test procedure
Q-capability Power factor 0.95 (underexcited) ≤ cosφ
≤ 0.95 (overexcited) Acc. to IEC 61400-21-1
No change from the
previous procedure
Frequency Range Test Rated power production between 49.5 Hz
and 50.5 Hz and no disconnection
between 47.5 Hz and 52 Hz
Active power set-point Confirm capability
Active power ramp
rate limitation
Control of the rate of change of power
output at a rate not
more than ± 10% per minute
Acc. to IEC 61400-21-1Frequency Droop Frequency control at a droop of 3% to 6%
Synthetic inertia Real power primary frequency response
of at least 10% of nominal capacity within
1 s
Grid protection Limits in voltage/frequency levels and
time response
Acc. to IEC 61400-21-1
20192019
20192019
20192019
ASSESSMENT OF COMPLIANCE WITH CEA REGULATION 2019
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1. Testing has to be performed by laboratories accredited according to
ISO/IEC 17025
2. A full Test Report according to IEC 61400-21-1 and CEA should be
submitted for assessment to the Certification Bodies, including
detailed results and graphs
3. FRT voltage levels to follow CEA profile - the unit shall remain
connected during and after the faults for two consecutive tests – for
LVRT, injection of reactive power during the dip is required (active
power as 2nd priority)
4. Comparison of the measured harmonics with the limits of IEEE 519
Further analysis is recommended if a violation is noticed.
Main success criteria
CONCLUSIONS
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Testing needs to be performed by accredited laboratories to ensure
same level of quality
1
2
3
For CEA 2019 requirements, the testing procedure of the IEC
61400-21-1 (2019) is recommended. Special evaluation for
harmonics is required according to IEEE 519
Uniform reporting requirements are suggested to ensure
comparability for the Certification process
A dedicated CEA testing procedure will be helpful to avoid
discrepancies among Testing Laboratories and Certification Bodies4
Page 13
Nivedh BS
Engineering Leader, Wind Turbine Products & Components
UL India Private Ltd
[email protected] +91 80 41384400
Thank you!
UL and the UL logo are trademarks of UL LLC © 2017. Proprietary & Confidential.
