experiences of coordinated volt/var control algorithm for medium...
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OPERATION AND CONTROL OF ACTIVE DISTRIBUTION NETWORKS
Experiences of coordinated Volt/Var control algorithm for medium voltage networks with high
share of distributed Generation
Roman Schwalbe
Austria
PAPER #433 LISBON 2013
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DG DEMONET PROJECT LISBON 2013
Objective:
Development, planning, implementation and validation of voltage control concepts allowing a cost-effective integration of very high shares of distributed generation in medium voltage networks,
• maintaining a high level of quality of supply
• achieving economic benefits in comparison to network reinforcement
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• LevelController: Utilizes the tap-change-capability of the central MV-transformer to raise or lower the voltage in the whole MV-grid to keep all nodes in the grid within the allowed voltage-limits.
• RangeController: Utilizes the capability of generators to produce reactive power to keep the range between the highest and the lowest voltage in the grid within the allowed range.
110 kV
30 kV
DG
DG
Range
Control
Level
ControlAVC
UHVnTap
Pact,UDG
Pact,
UDG
UCN
Q,P
Q,P
Communication (PLC, Radio Link, WiMax)
OLTC
CVCU
Central Voltage
Control Unit
MV
Distribution
NetworkUset
Q,P
VOLTAGE CONTROL CONCEPT LISBON 2013
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• Critical Nodes
– Nodes which have the highest or lowest voltage within a year
– Determined by offline power flow calculation
• Contribution Matrix
– Linearised model of the network
– Has to be determined via offline power flow sensivity analysis
VOLTAGE CONTROL CONCEPT LISBON 2013
0 5 10 15 20 25 30 0.98
0.99
1
1.01
1.02
83902
Distance (km)
Voltage(
p.u
.)
Voltage drop diagram of node 83902 at max_time 8.5.2005 | 03:15
Node Coritcal node Critical node hydropower
reduce
DG
P
DGCNDG
Q
DGCNCN
result
CN PAQAUU ,,
DG
CNP
DGCN
DG
CNQ
DGCN
P
UA
Q
UA
,
,
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VOLTAGE CONTROL VALIDATION LISBON 2013
• Validation of control concept in two Austrian distribution grids ‘Lungau’ and ‘Nenzing’
substation ‘Lungau’
active / apparent
power Transformer 1 32 MVA Transformer 2 32 MVA DG 1 0,95 MW DG 2 2,50 MW DG 3 0,80 MW Peak Demand 24 MW Peak Generation 8 MW
Critical Nodes 9
substation ‘Nenzing’
active / apparent
power Transformer 1 40 MVA Transformer 2 40 MVA DG 1 0,82 MW DG 2 0,96 MW DG 3 0,60 MW Peak Demand 32 MW Peak Generation 33 MW
Critical Nodes 16
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• Motivation
– Provide actual information which critical nodes are actually supplied by the controlled substation
– Contribution matrix values depend on the actual grid’s switching state
• Topology recognition systems:
– ‘Lungau’: .xml-file which contains topology information is provided and automatically updated by external topology extraction tool (part of process control system)
– ‘Nenzing’: Process variables contain information to which substation the critical nodes are connected
TOPOLOGY RECOGNITION LISBON 2013
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SCADA INTEGRATION NENZING LISBON 2013
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• Smooth decrease of HV grid voltage during 2min
VOLTAGE VARIATIONS LUNGAU LISBON 2013
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• All process-variables invalid for ~20min
COMMUNICATION BLACKOUT LISBON 2013
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• Refitting reactive power control for existing DGs is extremely time-consuming, costly, and does not lead to satisfying results
• Topology recognition system has to be improved / dependency of topology information has to be reduced
• Coordinated Voltage Control Concept works sucessfully
• Validation in progress until June 2013: Answer the question how much voltage band can be freed for the integration of renewables with Coordinated Voltage Control?
CONCLUSION LISBON 2013
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Thank you for your attention!
Project partners:
Project supported by:
BSc Roman Schwalbe
Energy Department
Electric Energy Systems
AIT Austrian Institute of Technology
Giefinggasse 2 | 1210 Vienna | Austria
T +43(0) 664 73146308
roman.schwalbe@ait.ac.at | http://www.ait.ac.at
QUESTIONS? LISBON 2013
mailto:roman.schwalbe.fl@ait.ac.athttp://www.ait.ac.at/
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BACKUP SLIDES LISBON 2013
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Range Controller Aim:
BACKUP SLIDES LISBON 2013
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Range Controller improvements for better solvability:
BACKUP SLIDES LISBON 2013
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Real Process, Simulation and testing
BACKUP SLIDES LISBON 2013
COMSICAM
230
IEC 104MV
Network
OPCPower
FactoryCVCUOffline Sim ulation
Real Tim e Sim ulation Process Interface via SCADA
Telecontrol interface
SIMULATION
REAL PROCESS
VOLTAGE CONTROLLER
COM
OPC
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