the university of seville smart grid lab: a multi-platform ...the university of seville smart grid...
TRANSCRIPT
The University of Seville Smart Grid Lab: A Multi-Platform Test Bed to Teach
Active Distribution Networks
José M. Maza-Ortega, A. Gómez-Expósito, M. Barragán-Villarejo, F.P. García-López,
J.I. Jiménez-Anguiano, J.M. Mauricio-FerramolaL. Alvarado-Barrios
Power Engineering GroupUniversity of Sevilla
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Contents
• Sevilla School of Engineering• CIGRE Task Force C06.04.02 Distribution Network• Scaled-down laboratory network• Omnimode Load Emulator (OLE) concept• Hardware implementation of the OLE• Control of the scaled-down distribution system• Test results• Including the scaled-down laboratory network in curricula• Conclusions and acknowledgements
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Sevilla School of Engineering
• University of Sevilla created in 1505 (Julio II Pope’s edict)• School of Engineering created in 1964• Currently all branches of engineering:
• Nearly 6000 students• Over 450 teaching staff
Aerospace Engineering
Civil Engineering
Chemistry Engineering
Business Engineering
Telecomunnication Engineering
Industrial Engineering
Energy Engineering
Electronics Engineering
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Sevilla School of Engineering
• Power Engineering courses in the graduate curricula:
• Why to teach active distribution networks?• Social demand• Industry demand
Electrical InstallationsElectrical Lines & CablesElectrical MachinesElectrical InstrumentationElectrical DrivesElectrical DistributionPower System Analysis
Power System SimulationPower QualityConventional Power PlantsIntegration of Renewable Power PlantsEnergy EfficiencyWind EnergyPhotovoltaic Power PlantsAircraft Power Systems
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CIGRE Task Force C06.04.02 Distribution Network
• Distribution network description:• MV actual German network • Radial feeders with high R/X ratios• Objective: analysis of DG integration• Two feeders with 14 nodes• Loads:
• Residential, commercial & industrial• Generation:
• PV, wind energy & CHP• Energy storage• DC link between the feeders
K. Rudion, A. Orths, Z.A. Styczynski, K. Strunz, “Design of benchmark of medium voltage distribution network for investigation of DG integration“, IEEE PES General Meeting, 2006.
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CIGRE Task Force C06.04.02 Distribution Network
• Load/generation daily profiles:
Residential
Industrial
Wind Power
PV Power
CHP
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Scaled-down laboratory network
• Objective:• Hardware test bed reproducing the behaviour of the MV network
• Scaled-down system:• Base magnitudes:
• Voltage: 20 kV → 400 V • Apparent Power: 20 MVA → 100 kVA
• Feeder branches: • Concentrated parameters (equivalent R,X)• Configurable R/X ratios & feeder lengths by series/paralell
association • Load/Generation: Omnimode Load Emulator (OLE)
• Voltage Source Converter: 20 kVA, 400 V, three-phase & three-wire• Centralized control of the system
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Scaled-down laboratory network
• Scaled-down system:Network branches Inductors
ResistorsOmnimode Load Emulators
Network nodes
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Omnimode Load Emulator (OLE) concept
• Voltage Source Converter (VSC) in each node:• Possibility of setting P & Q in each node• Common DC for all VSCs• Additional VSC for balancing the active power in the DC bus
Distributionnetwork
OLE1
OLE N
OLE j
BalanceVSC
LV Labnetwork
DC Bus+-
P1 Q1
Pj Qj
PN QN
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Hardware implementation of the OLE
• Electrical cabinet:
VSCs (20 kVA)
LCL coupling filter
Local controller
Measurement unit
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Control of the scaled-down distribution system
• Control scheme:• Centralized controller: Real Time Machine (SpeedGoat)• Local Controller: DSP (Texas Instrument Concerto)• Communications between centralized & local controllers: UDP
VSCDSP
PWM control(10 kHz)
PQ references(1 second)Control
Center
VSC Current & Voltage(50 microseconds)
VSC Current & Voltage(2 milliseconds)
UDP Communication Analog and Digital Signals
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Control of the scaled-down distribution system
• Task of the centralized controller:• Control of each individual OLE:
• Objective: set active and reactive power daily profiles• Tools:
• Load Profile Tool• Node Configuration Tool
Load Profile Tool Node Configuration Tool
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Control of the scaled-down distribution system
• Task of the centralized controller:• Supervision of the network state including OLE state machines
• Objectives:• Measure the actual active & reactive power of the OLEs• State of the OLEs (start/stop)• Fault condition
• Tool: SCADA system Monitoring tool
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Test results
• Waveform of the OLE current:Half load
Voltage: 400 V Current: 15 AVdc: 730 V THD= 2.2%
Full load
Voltage: 400 V Current: 30 AVdc: 730 V THD= 1.9 %
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Test results
• Active and reactive power tracking:
0 200 400 600 800-2000
0
2000
4000
6000
8000
10000VSC5
time (sec.)
PP*QQ*
Load daily profile PV + load daily profile
0 200 400 600 800-4000
-3000
-2000
-1000
0
1000VSC4
time (sec.)
PP*QQ*
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Test results
• Influence of the distributed generation:
0 100 200 300 400 500 600 700 800200
205
210
215
220
225
230
235
240
Time (sec.)
Volta
ge (V
)
Load+PV scenarioLoad scenario
0 200 400 600 800-2000
0
2000
4000
6000
8000
10000VSC5
time (sec.)
PP*QQ*
0 200 400 600 800-4000
-3000
-2000
-1000
0
1000VSC4
time (sec.)
PP*QQ*
OLE: 2, 3, 6 & 7 OLE: 1 & 5
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Scaled-down network in undergraduate curricula
• Laboratory practices:• Experimental validation of simulation results• Comparing passive vs. active distribution networks• Contribution of DG to the optimal operation of distribution networks• Real time application of algorithms:
• Control centers (DMS):• State estimation• Centralized voltage control• Network reconfiguration
• Power electronic-based devices:• DG units: PV, PMSM, DFIM• Voltage controllers: STATCOM, DVR• Flexible links: back-to-back, UPFC, SSSC
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Conclusions and acknowledgements
• Conclusions:• Scaled-down of an actual MV distribution system• Fully automated operation• Useful for Power Engineering Courses dealing with active distribution• Focus on the AC grid with several functionalities
• Acknowledgements:• Flexible operation of distribution power networks by using electronic
converters (FLEXILINK). Spanish Ministry of Science and Innovation (DGI). (ENE2011-24137)
• Joint Project of Intelligent Grids in the Henares Corridor: Renewable Energy Integration (PRICE-GDI). Ministry of Economy and Competitiveness. INNPACTO Program. (IPT-2011-1501-920000)
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