loss of synchronous generation impacts and mitigation meppi pres vartanian.pdf · for ee500e energy...
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Loss of Synchronous Generation Impacts and Mitigation
MEPPIPower Systems Engineering Division (PSED)
for EE500E Energy & Environment Seminar, University of WA, October 5, 2017
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Agenda1. An Active Industry Issue: Loss of Synchronous Generation
2. Impacts from Loss of Synchronous Generation
a) Reduced fault duty
b) Reduced inertia
3. Mitigation Options
a) Comparative overview of mitigation options
b) Examples
4. Examples of Simulating Impacts and the Relative Performance of Mitigation Options
5. Extract from a NERC Inverter Performance Task Force report on the Blue Cut Fire related 1,200MW PV Loss Related System Disturbance
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Loss of Synchronous Generation Within Our Interconnect
1. SONGS Nuclear Shutdown2,500 MVA generation capacity loss, with associated –66 kA Amps (at 22 kV) reduced system fault current contribution & -13.5 MW-s reduced system inertia contribution
2. Diablo Canyon Nuclear Shutdown2,640 MVA generation capacity loss, with associated –61 kA Amps (at 25 kV) reduced system fault current contribution & -12.5 MW-s reduced system inertia contribution
3. Coastal Once Through Cooling (OTC) Gas Fired Generation Shutdown~ 5 GVA generation capacity loss, with associated –325 KA Amps reduced system fault current contribution & -15 MW-s(H) reduced system inertia contribution
4. Western Coal Shutdown, IPP, other Rocky Mountain States’ Coal Plants1,982 MVA generation capacity loss with future IPP shutdown, with associated –44 KA Amps reduced system fault current contribution & -5.7 MW-s(H) reduced system inertia contribution
Increased risk of loss of protection coordination.
Diminished frequency deviation recovery.
Reduced stability-criteria-compliance margin.
Reduced total import capability into California.
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Selected Impacts for Discussion
1. “Generators that use inverters to interface to the grid … can only supply relatively small amounts of short circuit current. Typically, inverter short circuit current is limited to a range of 1.1 to 1.4 per unit. As the penetration levels of these generators increases and displaces conventional synchronous generation, the available short circuit current on the system will decrease. This may make it more difficult to detect and clear system faults. “
2. “… as DER displaces synchronous generation, there may be times when there is insufficient system inertia and primary frequency response to arrest frequency decline and stabilize the system frequency following a contingency.”
(emphasis added)
From “Potential Bulk System Reliability Impacts of Distributed Resources”, NERC, August 2011
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Reduced SCD Impact Mitigation, How Much Replacement Fault Current Needed?DER Models to Simulate Impact and Mitigation?
From “Distribution System Feeder Overcurrent Protection”, GET-6450, GE
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Lack of DER Models: A Challenge to Understanding Fault Current Impacts
From “Potential Bulk System Reliability Impacts of Distributed Resources”, NERC, August 2011
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• The magnitude of inertial response depends on the amount of synchronous generation and motors online.
• The greater the number of synchronous generation and load online the larger the inertial response resulting in a smaller decrease in system frequency deviation.
Msys = System inertiaHi = Generator/motor inertia constant (seconds on MVA rating)MVA = Generator/motor MVA rating
From “ERCOT Essential Reliability Services Tutorial: Frequency Support
Inertial Response
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Figure: Example Frequency Response to an “Event”
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Example Frequency Response in WECC
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Frequency response showing the simulated loss of two Palo Verde units for WECC 2014 peak (blue) on July 1, 2014, and the WECC 2014 low load (Red) on November 2, 2014 cases. This figure highlights the impact of system loading on frequency response
Figure: Example Frequency Response in WECC to a loss of 2750 MW
Peak Load
Light Load
From “Essential Reliability Services Task Force Measures Framework Report”, NERC, November 2015
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Example Inertial Response in ERCOT:Impact of Renewables
From “Essential Reliability Services Task Force Measures Framework Report”, NERC, November 2015
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Figure: ERCOT historical kinetic energy boxplots (2010-2017)
Figure: Calculated system frequency after 2750 MW generation trip during nonsynchronous generation
peak in ERCOT (years 2010-2014)
Total wind generation
Approximately 24,000 MW of system load
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Overview of XMSN Mitigation Options
*Response time from receiving control signal to reaching target power output level
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SC SVC STATCOM BESS (w/inverter)
MVA Range 100-500 1-250 1-250 1-50
Operating Quadrants+/- Q +/- Q +/- Q
+/- P (State of Chg >0)
+/- Q
Overload Capability,Multiples of full load A
8X 1X 2.0X 1.2X
Inertia Medium,Rapid decay
n/a n/a Synthetic, High,4X equivalent damping/MVA
Min. ResponseTime*, ms 1,200 for Q 20 for Q 10 for Q
100 for P100 for Q
Max. Ramp Rate(MVA/s)
Medium High High High
Output vs Control, Accuracy/Lag
Low/High Med./Low High/Low 0
Typical Unit Cost, $/KVA
$250/kVAr,>50 MVA
$150/kVAr,>50 MVA
$175/kVAr>50 MVA
$500/kVA power>10 MVA, >1-hr
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Project Examples, Synthetic Inertia
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Project Examples Synthetic Inertia(F/R) thru Full Peaker Replacement Capabilities
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http://www.mitsubishielectric.com/news/2016/0303-b.html?cid=rssMitsubishi Electric Designed and Built BESS, 50 MW 300MWh
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Synthetic Inertia & SCD Solution Example, Distributed Resource/Distribution PRODUCT
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MEPPI D-STATCOM
• 2-Quadrant “buck and boost” Voltage Regulation (CVR)
• Volt/VAR Optimization (VVO)• Harmonic Mitigation (5th and 7th)• Voltage Phase Balancing ±5% (patent pending)• Transient Voltage Overvoltage and Sag Mitigation• Improvement of Voltage Regulation and Control• Short Term Voltage Stability
Grid CoRe Series• Fast Reaction Time(ms)• Dynamic Functionality
(not stepped)• Self Protecting (cannot be
overloaded)
D-STATCOM Product Family Configurations
1 2 3 4 5 6 7 8
Product Type Rating (kVAR)Product
Generation - Cell BypassHarmonic
Mitigation
Voltage Phase
Balancing - Transformer
Type
TX Voltage
(High Side)kV
GC 500 A B - Yes H - Yes P - YesAir Insulated -
AI#.#
GP 1000 0 - No 0 - No 0 - NoOil Insulated -
OI0 if 7 is 0
GM 1500Customer
Supplied - 0
2000
GB Grid CoRe Series - 2 Quadrant Device for VVO Support
GP Grid Power Series - 4 Quadrant Device for VVO and Frequency Support
GM Grid Management Series - 4 Quadrant Device with VVO, Frequency Support, and Short Term Battery Storage
• Lower System Losses• Increase System Reliability• Support Renewable Integration• Improve Transient Stability• Reduce Temporary Overvoltage’s• Increase other T&D assets’ life and utilization
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Simulation for Information
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“Studies for Battery Energy Storage Systems
(BESS)”
February 2016
Revision #01
Prepared by:
Mitsubishi Electric Power Products, Inc. (MEPPI)
Power System Engineering Services Department
Warrendale, Pennsylvania
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Customers Have Asked Us toExamine the Following Topics
• Understanding the impact of batteries on the power system.– Maintain, create, and validate models in various software suites
(PSS/E, PSLF, DigSilent, PSCAD, EMTP, CYME, OpenDSS, Gidlab-D, etc.).
• Adding a BESS into a utilities solution tool-kit.
• Computer simulation allows the utility to understand the impact ofBESS’ on their power system. The following are examples of typesof studies that can be performed:– Determining the impact of the BESS and the inverter control system on
the electric power system.– Interaction with other power electronic devices.
• Controls interaction, anti-islanding detection concerns.
– Black start studies– BESS sizing and optimal location.
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Customer Problem: Investigate BESSas an Alternative for Black Start Studies Power
• BESS’ can be utilized in a power system black start scheme.
• Utilizing both time domain and positive sequence analysis tools the abilityof the BESS to start a cranking path and conventional generation can be
confirmed.
G
69 kV
230 kV
230 kV
58 mi
230 kV
0.5 mi
69/13.8 kV
36 MVA
New generator or energy
storage device used to
energize the system.
Location of generator to
be started
M
230/13.8 kV
Location of voltage and
frequency measurements
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0 5 10 15 20 25 300.84
0.86
0.88
0.9
0.92
0.94
0.96
0.98
1
1.02
1.04
Time (s)
Vo
ltag
e M
ag
nit
ud
e (
p.u
.)
300 hp
750 hp
1500 hp
3000 hp
0 5 10 15 20 25 300.84
0.86
0.88
0.9
0.92
0.94
0.96
0.98
1
1.02
1.04
Time (s)
Vo
ltag
e M
ag
nit
ud
e (
p.u
.)
300 hp
750 hp
1500 hp
3000 hp
• It was observed that the BESS provided better regulation of the voltage at the 69 kVbus than a traditional peaker unit and it’s associated excitation system.
– The BESS resulted in reduced voltage dips and overshoot at the regulating bus regardlessof the size of the started generator.
Voltage Response During Black Start
Peaker Unit BESSNote improvement
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Frequency Response During Black Start
Peaker Unit BESS
0 5 10 15 20 25 3057
57.5
58
58.5
59
59.5
60
60.5
Time (s)
Gen
era
tor
Fre
qu
en
cy (
Hz)
300 hp
750 hp
1500 hp
3000 hp
• It was observed that the BESS provided better regulation of the frequency at the 69kV bus than a traditional peaker unit and it’s associated excitation system.
– The BESS resulted in reduced frequency dips at the regulating bus regardless of the size of
the started generator.
0 5 10 15 20 25 3057
57.5
58
58.5
59
59.5
60
60.5
Time (s)
Gen
era
tor
Fre
qu
en
cy (
Hz)
300 hp
750 hp
1500 hp
3000 hp
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Ideas on Future Informative Studies
1. DER Penetration Impact Study ConceptsDevelop ‘aggregate’ DER models for implementation in bulk power system studiesDevelop Bulk System Cases: IEEE1547-2003 compliant DER that Anti-island (drop off), 20%, 30, 40%, 50%Develop Bulk System Cases: 1547 Revision/UL-1741-SA Compliant DER that Ride Thru, 20%, 30%, 40%, 50%
2. Evaluate System Performance Benefits From BESS Advanced FunctionalityImpact of implementing FRR capability for inverter or FACTS connected resourcesImpact of H-equivalent active damping from inverter or FACTS connected resourcesImpact from (need for?) short term overload capability for inverter and FACTS connected resources Develop study methodology to determine fault duty contribution needed to preserve legacy ToC based protection coordination, through distribution level Other?
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SELECTED NERC SLIDES, fromBLUE CUT FIRE PV INTERUPPTION
DISTURBANCE REPORT
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Source, NERC
http://www.nerc.com/pa/rrm/ea/Pages/1200-MW-Fault-Induced-Solar-Photovoltaic-
Resource-Interruption-Disturbance-Report.aspx
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Source, NERC
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Source, NERC
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Source, NERC
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Source, NERC
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Source, NERC
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Source, NERC
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Source, NERC
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Source, NERC
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Source, NERC
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Source, NERC
http://www.nerc.com/pa/rrm/ea/Pages/1200-MW-Fault-Induced-Solar-Photovoltaic-
Resource-Interruption-Disturbance-Report.aspx
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Thank you, and for more information:
Charlie Vartanian P.E., Western [email protected]
Rob Hellested, Section Manager, [email protected]
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BACKGROUND SLIDES
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COPYRIGHT © MITSUBISHI ELECTRIC CORPORATION. ALL RIGHTS RESERVED.
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COPYRIGHT © MITSUBISHI ELECTRIC CORPORATION. ALL RIGHTS RESERVED.
NO PART SHALL BE COPIED OR TRANSFERRED WITHOUT PRIOR PERMISSION.
MEPPI is a MELCO-owned American Company combining the best of
Japanese and American business practices to bring high quality products
to our local customers.
• Incorporated in December 1985
– 50/50 Joint Venture of Westinghouse Electric and Mitsubishi Electric
– Named WM Power Products, Inc.
• Became 100% subsidiary of Mitsubishi Electric in 1989
– Named Mitsubishi Electric Power Products, Inc.
– Supporting the Energy and Electrical Systems Group of MELCO
• Local capabilities
– Headquartered in Warrendale PA
– Manufacturing, product integration,
project management, service, NPD,
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NO PART SHALL BE COPIED OR TRANSFERRED WITHOUT PRIOR PERMISSION
COPYRIGHT © MITSUBISHI ELECTRIC CORPORATION. ALL RIGHTS RESERVED.
NO PART SHALL BE COPIED OR TRANSFERRED WITHOUT PRIOR PERMISSION.
COPYRIGHT © MITSUBISHI ELECTRIC CORPORATION. ALL RIGHTS RESERVED.
NO PART SHALL BE COPIED OR TRANSFERRED WITHOUT PRIOR PERMISSION.
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547 BldgSubstations, GIS, FACTS, BESS
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MEPPI USA locations
Warrendale, PA
Lake Mary, FLGeneration
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