microgrid islanding via goose messaging · 2017-10-26 · microgrid islanding via goose messaging....
TRANSCRIPT
Joseph Petti, Kevin Phelps, Chris Mertz, and Kyle Thomas
Dominion Energy®
10/26/20171
Microgrid Islanding via GOOSE Messaging
Microgrid Introduction
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A microgrid is a group of interconnected loads and distributedenergy resources within clearly defined electrical boundariesthat acts as a single controllable entity with respect to thegrid. A microgrid can connect and disconnect from the grid toenable it to operate in grid‐connected or island mode.‐ Department of Energy
Potential benefits include….. Enhanced local reliability Reduced emissions Improved system resiliency Lowered energy cost
• Microgrid market is growing• Estimated revenues of $20 Billion in 2020
• Many predict utilities are destined to play a role• ComEd – “Community of the Future” – Chicago, IL• Duke Energy – “Microgrid Training Center” – Mount Holly, NC• National Grid – “Clarkson U. Microgrid” – St. Lawrence County, NY• S&C Electric – “Santa Rita Jail Microgrid” – Alameda County
• Develop Dominion Energy owned microgrid• Validate innovative solutions in physical setting
Project Value
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• Incorporate a microgrid into Dominion Energy’s grid safely• Tasks
• Develop an islanding scheme• Alter existing DG trip scheme
• Create and simulate model to validate microgrid functionality• RSCAD• SEL relays• RTDS
Project Summary
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Simulation Goals
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• Stabilize MG after transition from grid connected to islanded mode• Need to ensure voltage, frequency, and power quality are established
extremely quickly (ideally < 1 second)• Observable events
• Relay actions• Fault recognition• Islanding • MG generation start up
• Voltage Stability• Return to 1 p.u.
• Frequency Stability• Return to 60 Hz
Communication Protocol: GOOSE Messaging
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• SEL relays communicate GOOSE messages• Generic Object Oriented Substation Events (GOOSE)
• Defined by IEC 61850• Allows multiple devices to simultaneously receive same message• Brand Independent
• Promotion of high inter‐operability between systems from different vendors• Ethernet• VLAN
• Priority Levels – allow separate networks within a physical network
0
0.2
0.4
0.6
0.8
1
1.2
0.197 0.207 0.217 0.227 0.237 0.247
Volta
ge (p
.u.)
Time(s)
MG Load Voltage Vs. Time
MG Load Voltage
Results – Relay Actions
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T1 T2 T3
• T1: Fault occurs: 0.2s
• T2: MG islands: 0.226s
• T3: MG generation comes online: 0.237s
• 37 ms from fault to MG control process completion
Results – Voltage Stabilization
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0
0.2
0.4
0.6
0.8
1
1.2
0.197 0.207 0.217 0.227 0.237 0.247 0.257
Volta
ge (p
.u.)
Time(s)
MG Load Voltage Vs. Time
MG Load Voltage
T1 T2
• T1: Fault occurs: 0.2s
• T2: Voltage stabilizes: 0.262s
• 62 ms from fault to MG load voltage stabilization
Results – Frequency Stabilization
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T1 T2
• T1: Fault occurs: 0.2s
• T2: Frequency stabilizes: 0.274s
• 74 ms from fault to MG frequency stabilization
0
20
40
60
80
100
120
0.195 0.215 0.235 0.255 0.275
Freq
uenc
y (H
z)
Time(s)
MG Frequency Vs. Time
MG Frequency
• SEL relay communication via GOOSE messaging is suitable for microgrid islanding
• Relay to relay via GOOSE: 6 ms• Voltage stabilization: ~4 cycles• Frequency stabilization: ~4 cycles
• SEL relays and microgrid controls can be combined for islanding scheme
Conclusions
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• Further utilize SEL‐3530 for more advanced schemes• Load Shedding within microgrid
• Incorporate more distribution system detail into RSCAD model• Include additional forms of energy generation
• Storage ‐ Batteries• Wind
• Implement microgrid in Dominion Energy territory
Future Work
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