PJM Generator Interconnection Request
Queue #B15
Morgantown / Oak Grove 230kV
Impact Study Report
March 2001
DMS#134867
General
Project B15 Interconnection Customer, Orion, requested interconnection of a 550 MW (summer)
gas-fired combined cycle generating facility to be located approximately 5 miles north of the
Hawkins Gate substation which is located in Charles County, Maryland. The generating facility
is scheduled to be commercial by June 2003. Pepco's four Morgantown-Talbert/Oak Grove 230
kV circuits are located next to the proposed generating site; two circuits were tapped for the
interconnection of project B15.
Direct Connection Requirements
Shown below is a one-line diagram for the proposed interconnection of Project #B15 generation
to the two Morgantown-Talbert/Oak Grove 230 kV circuits.
23087
23085
23085
23086
23086
B15
23084
230
157
23084
to Talbert - Oak
Grove
to Hawkins Gate Morgantown
23087
157
to Utility
Distribution
Circuit
Project B15 Interconnection Customer will assume responsibility for design and construction of
the new 230kV substation and connection to the two Morgantown - Oak Grove 230 kV circuits.
PEPCO will review the design, and perform the necessary construction management and
commissioning testing. In addition, PEPCO will also need to reroute the existing
telecommunication optical fiber circuits, install EMS and relay equipment interfaces, and make
all associated upgrades to existing equipment. The estimated cost of the work to be done by
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PEPCO is $3.7 million. The PEPCO work can be done concurrent with the Interconnection
Customer’s constructon of the 230kV substation.
Network Impacts
The system, as planned, was evaluated for compliance with reliability criteria. The Morgantown
B15 project was studied as 550MW capacity. The results are summarized below.
Normal System
No identified problems.
Single Contingency (MAAC Criteria IIA)
No identified problems.
Second Contingency (MAAC Criteria IIB)
No identified problems.
Multiple Facility Contingency (MAAC Criteria IIC)
No identified problems.
Generator Deliverability
No identified problems.
Stability (MAAC Criteria IV)
No identified problems. See attachment #1 for the fault cases evaluated.
The range of contingencies evaluated was limited to that necessary to demonstrate compliance
with MAAC Reliability Criteria IV.
Note: While the stability analysis has been performed at extreme system conditions, there is a
potential that evaluation at higher levels of generator output over a range of load levels would
disclose unforeseen stability problems. The MAAC yearly reliability analysis to be performed to
test all system changes will include this evaluation. Any problems uncovered will need to be
resolved.
CETO/CETL (MAAC Criteria III / VIIB)
No identified problems.
Short Circuit Analysis
No identified problems.
System Reinforcements and Cost Allocation
None.
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ATTACHMENT #1
(Morgantown/Oak Grove Project B15)
2005 Light Load Stability Faults
ALL FAULTS ARE STABLE
b15-1a 3ph @ B15 230 kV on B15 - Morgantown 23084
b15-1b 3ph @ B15 230 kV on B15 - Morgantown 23086
b15-1c 3ph @ B15 230 kV on B15 – Oak Grove 23084
b15-1d 3ph @ B15 230 kV on B15 – Oak Grove 23086
b15-1e slg @ B15 230 kV on B15 - Morgantown 23084, stuck at B15 (L/O 23086)
b15-1f slg @ B15 230 kV on B15 - Morgantown 23086, stuck at B15 (L/O 23084)
b15-1g slg @ B15 230 kV on B15 – Oak Grove 23084, stuck at B15 (L/O 23086)
b15-1h slg @ B15 230 kV on B15 – Oak Grove 23086, stuck at B15 (L/O 23084)
b15-2a 3ph @ Morgantown 230 kV on Morgantown – B15 23076
b15-2b 3ph @ Morgantown 230 kV on Morgantown – Oak Grove 23077
b15-2c 3ph @ Morgantown 230 kV on Morgantown – Oak Grove 23085
b15-2d 3ph @ Morgantown 230 kV on Morgantown – B15 23086
b15-2e 3ph @ Morgantown 230 kV on Morgantown – Chalk Point 23071
b15-2f slg @ Morgantown 230 kV on Morgantown – Oak Grove 23085, stuck at Morgntwn
(L/O Morg north bus)
b15-2g slg @ Morgantown 230 kV on Morgantown – Chalk Point 23071, stuck at Morgntwn
(L/O Morg north bus)
b15-3a 3ph @ Chalk Point 230 kV on Chalk Point – Morgantown 23072
b15-3b 3ph @ Chalk Point 230 kV on Chalk Point – Oak Grove 23062
b15-3c 3ph @ Chalk Point 230 kV on Chalk Point – Bowie 23063
b15-3d 3ph @ Chalk Point 230 kV on Chalk Point 500/230 #6
b15-3e slg @ Chalk Point 230 kV on Chalk Point – Morgantown 23074, stuck at Chalk Point
(L/O 23065)
b15-3f slg @ Chalk Point 230 kV on Chalk Point – Bowie 23065, stuck at Chalk Point (L/O
23074)
b15-4a 3ph @ Oak Grove 230 kV on Oak Grove – B15 23066
b15-4b 3ph @ Oak Grove 230 kV on Oak Grove – B15 23068
b15-4c slg @ Oak Grove 230 kV on Oak Grove – Burtonsville 23042, stuck at Oak Grove (L/O
23064)
b15-4d slg @ Oak Grove 230 kV on Oak Grove – Burtonsville 23045, stuck at Oak Grove (L/O
23068)
b15-5a slg @ Burches Hill 230 kV on Burches Hill – Alabama 23093, stuck at Burches Hill (L/O
23081)
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b15-5b slg @ Burches Hill 230 kV on Burches Hill – Palmers Corner 23091, stuck at Burches
Hill (L/O 23082)
b15-5c slg @ Burches Hill 230 kV on Burches Hill 500/230 kV, stuck at Burches Hill (L/O
23092)
b15-6a slg @ Chalk Point 500 kV on Chalk Point – Burches Hill, stuck at Chalk Point (L/O
500/230 #6)
Fault #
b15-1a
b15-1b
b15-1c
b15-1d
b15-1e
b15-1f
b15-1g
b15-1h
b15-2a
b15-2b
b15-2c
b15-2d
b15-2e
b15-2f
b15-2g
b15-3a
b15-3b
b15-3c
b15-3d
b15-3e
b15-3f
b15-4a
b15-4b
b15-4c
b15-4d
b15-5a
b15-5b
b15-5c
Fault Description
3ph @ B15 230 kV on B15 - Morgantown 23084
3ph @ B15 230 kV on B15 - Morgantown 23086
3ph @ B15 230 kV on B15 - Oak Grove 23084
3ph @ B15 230 kV on B15 - Oak Grove 23086
slg @ B15 230 kV on B15 - Morgantown 23084, stuck at B15 (L/O 23086)
slg @ B15 230 kV on B15 - Morgantown 23086, stuck at B15 (L/O 23084)
slg @ B15 230 kV on B15 - Oak Grove 23084, stuck at B15 (L/O 23086)
slg @ B15 230 kV on B15 - Oak Grove 23086, stuck at B15 (L/O 23084)
3ph @ Morgantown 230 kV on Morgantown - B15 23076
3ph @ Morgantown 230 kV on Morgantown - Oak Grove 23077
3ph @ Morgantown 230 kV on Morgantown - Oak Grove 23085
3ph @ Morgantown 230 kV on Morgantown - B15 23086
3ph @ Morgantown 230 kV on Morgantown - Chalk Point 23071
slg @ Morgantown 230 kV on Morgantown - Oak Grove 23085, stuck at Morgntwn (L/O Morg north bus)
slg @ Morgantown 230 kV on Morgantown - Chalk Point 23071, stuck at Morgntwn (L/O Morg north bus)
3ph @ Chalk Point 230 kV on Chalk Point - Morgantown 23072
3ph @ Chalk Point 230 kV on Chalk Point - Oak Grove 23062
3ph @ Chalk Point 230 kV on Chalk Point - Bowie 23063
3ph @ Chalk Point 230 kV on Chalk Point 500/230 #6
slg @ Chalk Point 230 kV on Chalk Point - Morgantown 23074, stuck at Chalk Point (L/O 23065)
slg @ Chalk Point 230 kV on Chalk Point - Bowie 23065, stuck at Chalk Point (L/O 23074)
3ph @ Oak Grove 230 kV on Oak Grove - B15 23066
3ph @ Oak Grove 230 kV on Oak Grove - B15 23068
slg @ Oak Grove 230 kV on Oak Grove - Burtonsville 23042, stuck at Oak Grove (L/O 23064)
slg @ Oak Grove 230 kV on Oak Grove - Burtonsville 23045, stuck at Oak Grove (L/O 23068)
slg @ Burches Hill 230 kV on Burches Hill - Alabama 23093, stuck at Burches Hill (L/O 23081)
slg @ Burches Hill 230 kV on Burches Hill - Palmers Corner 23091, stuck at Burches Hill (L/O 23082)
slg @ Burches Hill 230 kV on Burches Hill 500/230 kV, stuck at Burches Hill (L/O 23092)
b15-6a
slg @ Chalk Point 500 kV on Chalk Point - Burches Hill, stuck at Chalk Point (L/O 500/230 #6)
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LOCAL
Primary
Stuck Breaker
4.2
4.2
4.2
4.2
4.2
4.2
4.2
4.2
4.2
4.2
4.2
4.2
4.2
4.2
4.2
4.2
4.2
4.2
4.4
4.2
4.2
4.2
4.2
4.2
4.2
4.7
4.2
4.4
3.2
11.6
11.6
11.6
11.6
11.6
11.6
12.3
12.3
12.3
12.3
15.9
15.4
15.6
12.6
REMOTE
Primary
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
3.4
4.7
4.7
4.7
4.7
4.7
4.7
5.2
4.7
6.6
3.2 @ Possum
4.2 @ Burch
ATTACHMENT #2
Unit Capability Data
Gross MW Output
GSU MW Losses
Unit Auxiliary Load MW
Station Service Load MW
Net MW Capacity
Net MW Capacity = (Gross MW Output - GSU MW Losses* – Unit Auxiliary Load MW - Station Service Load MW)
Queue and Position/Project Name/Unit ID(s): ________ B15/Morgantown-Oak Grove/CT1, CT2
Estimated In-Service Date (mm/dd/yy)______________________________________ June 2003
Primary Fuel Type: ____________________________________________________ Natural Gas
Maximum Summer (92º F ambient air temp.) Net MW Output**: ______________ 157 (Note 1)
Maximum Summer (92º F ambient air temp.) Gross MW Output: ______________________161
Minimum Summer (92º F ambient air temp.) Gross MW Output: _______________________96
Maximum Winter (30º F ambient air temp.) Gross MW Output: _______________________211
Minimum Winter (30º F ambient air temp.) Gross MW Output: ________________________126
Reactive Power Capability at Maximum Summer Net MW Output: _________________+98, -52
Individual Unit Auxiliary Load at Maximum Summer MW Output (MW/MVAR): ________ 1.8
Individual Unit Auxiliary Load at Minimum Summer MW Output (MW/MVAR): _________ 1.8
Individual Unit Auxiliary Load at Maximum Winter MW Output (MW/MVAR): _________ 1.8
Individual Unit Auxiliary Load at Minimum Winter MW Output (MW/MVAR): _________ 1.8
Station Service Load (MW/MVAR): ______________________________________ 0.4 (Note 2)
Please provide any comments on the expected capability of the unit:
Note 1: Transformer Losses = 1.21 MW.
Note 2: Represents ~ 1/3 of CC Unit.
Gross Power of CC unit at 92 F =161 x 2 + 243 = 565 MW Gross.
Net Power of CC Unit at 92 f = 157 x 2 + 230 = 544 MW Net.
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Unit Generator Dynamics Data
Queue and Position/Project Name/Unit ID(s): ________ B15/Morgantown-Oak Grove/CT1, CT2
MVA Base (upon which all reactances, resistance and inertia are calculated): _____________222
Nominal Power Factor:
0.85
Terminal Voltage (kV): ______________________________________________________ 16.5
Unsaturated Reactances (on MVA Base)
Direct Axis Synchronous Reactance, Xd(i) :___________________________________________ 183.39
Direct Axis Transient Reactance, X’ d(i):________________________________________________ 23.43
irect Axis Sub-transient Reactance, X”d(i): _____________________________________________ 18.14
Quadrature Axis Synchronous Reactance, Xq(i) : _____________________________________ 178.63
Quadrature Axis Transient Reactance, X’ q(i): ___________________________________________ 41.3
Quadrature Axis Sub-transient Reactance, X”q(i) :______________________________________ 17.89
Stator Leakage Reactance, Xl :__________________________________________________________ 14.24
Negative Sequence Reactance, X2(i): ___________________________________________________ 18.01
Zero Sequence Reactance, X0 : _________________________________________________________ 19.08
Saturated Sub-transient Reactance, X”d(v) (on MVA Base): ___________________________________ 16.68
Armature Resistance, Ra (on MVA Base): ______________________________________________________ 0.07
Time Constants (seconds)
Direct Axis Transient Open Circuit, T’do :______________________________________________ 9.921
Direct Axis Sub-transient Open Circuit, T”do : _________________________________________ 0.043
Quadrature Axis Transient Open Circuit, T’qo : __________________________________________ 1.1
Quadrature Axis Sub-transient Open Circuit, T”qo : ____________________________________ 0.077
Shaft Inertia (combined Generator/Prime Mover), H (kW-sec/kVA, on KVA Base):______ 6.543
Speed Damping, D (typically 0 to 2): ______________________________________ 0 (assumed)
Saturation Values at Per-Unit Field Voltages [S(1.0), S(1.2)]:_________________0.0815, 0.3761
Units utilize an ESAC2A (1992 IEEE type AC2A) exciter model.
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Unit GSU Data
Queue and Position/Project Name/Unit ID(s): ________ B15/Morgantown-Oak Grove/CT1, CT2
Generator Step-up Transformer MVA Base: _______________________________________225
Generator Step-up Transformer Impedance (R+jX, or %, on transformer MVA Base): _____ 14%
Generator Step-up Transformer Reactance-to-Resistance Ratio (X/R):____________________35
Generator Step-up Transformer Rating (MVA):______________ 135.54/180.27/225, OA/FA/FA
Generator Step-up Transformer Low-side Voltage (kV):_____________________________ 16.5
Generator Step-up Transformer High-side Voltage (kV): _____________________________230
Generator Step-up Transformer Off-nominal Turns Ratio (per-unit, typically 1.0): _________ 1.0
Generator Step-up Transformer Number of Taps and Step Size (%): ____________ 5 of +/-2.5%
GSUs are not shared.
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Unit Capability Data
Gross MW Output
GSU MW Losses
Unit Auxiliary Load MW
Station Service Load MW
Net MW Capacity
Net MW Capacity = (Gross MW Output - GSU MW Losses* – Unit Auxiliary Load MW - Station Service Load MW)
Queue and Position/Project Name/Unit ID(s): _____________ B15/Morgantown-Oak Grove/ST1
Estimated In-Service Date (mm/dd/yy): __________________________________B15 June 2003
Primary Fuel Type: ______________________________________________ Natural Gas/HRSG
Maximum Summer (92º F ambient air temp.) Net MW Output**: ______________ 230 (Note 1)
Maximum Summer (92º F ambient air temp.) Gross MW Output: ______________________243
Minimum Summer (92º F ambient air temp.) Gross MW Output: ______________________126
Maximum Winter (30º F ambient air temp.) Gross MW Output: _______________________293
Minimum Winter (30º F ambient air temp.) Gross MW Output: ________________________147
Reactive Power Capability at Maximum Summer Net MW Output: ________________+142, -75
Individual Unit Auxiliary Load at Maximum Summer MW Output (MW/MVAR): _______ 11.9
Individual Unit Auxiliary Load at Minimum Summer MW Output (MW/MVAR): ________ 10.0
Individual Unit Auxiliary Load at Maximum Winter MW Output (MW/MVAR): ________ 13.0
Individual Unit Auxiliary Load at Minimum Winter MW Output (MW/MVAR): _________ 6.5
Station Service Load (MW/MVAR): __________________________________ 0.4 MW (Note 2)
Please provide any comments on the expected capability of the unit:
Note 1: Transformer Loss =1.16 MW
Note 2: brepresents 1/3 total CC Unit
* GSU losses are expected to be minimal.
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** Your project’s declared MW, as first submitted in Attachment N, and later confirmed or
modified by the Impact Study Agreement, should be based on either the 92 o F Ambient Air
Temperature rating of the unit(s) or, if less, the declared Capacity rating of your project.
Unit Generator Dynamics Data
Queue and Position/Project Name/Unit ID(s): _____________ B15/Morgantown-Oak Grove/ST1
MVA Base (upon which all reactances, resistance and inertia are calculated): _____________276
Nominal Power Factor:
0.85
Terminal Voltage (kV): ________________________________________________________18
Unsaturated Reactances (on MVA Base)
Direct Axis Synchronous Reactance, Xd(i) :___________________________________________ 210.69
Direct Axis Transient Reactance, X’ d(i):________________________________________________ 26.44
Direct Axis Sub-transient Reactance, X”d(i) : ____________________________________________ 20.4
Quadrature Axis Synchronous Reactance, Xq(i) : _____________________________________ 205.22
Quadrature Axis Transient Reactance, X’ q(i): __________________________________________ 45.22
Quadrature Axis Sub-transient Reactance, X”q(i) :______________________________________ 20.12
Stator Leakage Reactance, Xl :__________________________________________________________ 15.96
Negative Sequence Reactance, X2(i): ___________________________________________________ 20.26
Zero Sequence Reactance, X0 : _________________________________________________________ 10.37
Saturated Sub-transient Reactance, X”d(v) (on MVA Base): ___________________________________ 18.77
Armature Resistance, Ra (on MVA Base): ______________________________________________________ 0.08
Time Constants (seconds)
Direct Axis Transient Open Circuit, T’do :____________________________________________ 10.127
Direct Axis Sub-transient Open Circuit, T”do : _________________________________________ 0.043
Quadrature Axis Transient Open Circuit, T’qo : _________________________________________ 1.13
Quadrature Axis Sub-transient Open Circuit, T”qo : ____________________________________ 0.075
Shaft Inertia (combined Generator/Prime Mover), H (kW-sec/kVA, on KVA Base):______ 7.514
Speed Damping, D (typically 0 to 2): ______________________________________ 0 (assumed)
Saturation Values at Per-Unit Field Voltages [S(1.0), S(1.2)]:_______________0.07395, 0.35201
Unit utilizes an ESAC2A (1992 IEEE type AC2A) exciter model.
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Unit GSU Data
Queue and Position/Project Name/Unit ID(s): _____________ B15/Morgantown-Oak Grove/ST1
Generator Step-up Transformer MVA Base: _______________________________________280
Generator Step-up Transformer Impedance (R+jX, or %, on transformer MVA Base): _____ 14%
Generator Step-up Transformer Reactance-to-Resistance Ratio (X/R):____________________35
Generator Step-up Transformer Rating (MVA):_______________ 168.67/224.34/280 OA/FA/FA
Generator Step-up Transformer Low-side Voltage (kV):_______________________________18
Generator Step-up Transformer High-side Voltage (kV): _____________________________230
Generator Step-up Transformer Off-nominal Turns Ratio (per-unit, typically 1.0): _________ 1.0
Generator Step-up Transformer Number of Taps and Step Size (%): ____________ 5 of +/- 2.5%
GSU is not shared.
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