Ancillary services from renewable power plants (RePlan)
Müfit Altin, Anca D. Hansen
DTU Wind Energy
DTU Wind Energy, Technical University of Denmark 02 October 2017
RePlan Project
• Funded by ForskEL
• Period: 1.03.2015 - 28.02.2018
Overall objective
• to enable a resilient power system by developing technical solutions for the provision of ancillary services (AS) by ReGen plants like WP and PV
Goals:
• to provide deep insight regarding the technical feasibilities of current ReGen technologies for providing AS.
• to provide solutions on different coordinated AS support scenarios
• verification and extensive studies for the quantification of the impact of AS from ReGenplants on the power system stability.
• to define guidelines & recommendations for implementation of control solutions for AS provision from ReGen plants
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DTU Wind Energy, Technical University of Denmark 02 October 2017
RePlan Focus
• to develop controllers for the delivery of AS from WP and PV plants:
– incorporating communication properties
– using existing simulation methods for renewable generation patterns
• AS in focus:
– voltage control support
– frequency control support
– rotor angular stability support
• suitability to coordinate the provision of the services from WP and PV plants, identifying and analyzing their strengths and limitations
• verify provision of AS from WP and PV plants both through simulation models and laboratory facilities (large or real small scale power systems)
• impact of communication and power availability forecast error in providing AS and coordination of ReGen plants
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DTU Wind Energy, Technical University of Denmark 02 October 2017
RePlan Participants
• DTU Wind Energy (project manager)
– wind power integration and control i.e. wind power plants models and control, variability, prediction and predictability of wind power
• DTU Elektro
– electric components & power systems, electricity markets and end-users, intelligent energy systems + small scale power system facility SYSLAB
• AAU Energy Technology
– modelling, operation and control of distribution networks with high penetration level of dispersed generation + Real time laboratory facilities
• AAU Wireless Communication Networks
– information & communication technology (ICT), network architectures, protocol solutions, evaluation methodologies for wireless /wired communication networks.
• Vestas Technology R&D
– industrial expertise and experience in wind turbine/power plant models, wind power plant real-time control and in testing wind power plants
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DTU Wind Energy, Technical University of Denmark 02 October 2017
RePlan Overview
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WP1
Technical feasibilities of ReGen technologies
WP2
Voltage stability
support
WP3
Frequency stability
support
WP4
Rotor angular stability
support
WP5
Verification of ancillary services from
ReGen power plants
WP
0
Manag
em
ent
WP
6
Dis
sem
ination
DTU Wind Energy, Technical University of Denmark 02 October 2017
WP1 – Technical Feasibilities of ReGen
Objectives
– to investigate the technical feasibilities of ReGen technologies like WP and PV.
– to define an hierarchical control framework including information and communication technology (ICT) for coordinated participation of ReGen in the provision of AS.
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DTU Wind Energy, Technical University of Denmark 02 October 2017
WP1 – Technical Feasibilities of ReGen
Results of WP1
– a detailed specification list of the technical requirements for the development of generic model and control platform for ReGen plant
– a hierarchical control framework including ICT for coordination of the ancillary services from WP and PV plants
– optimal dispatch strategy using information exchange between the participating power plants at the different levels in the hierarchy
Report is available: http://www.replanproject.dk/Publications/
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DTU Wind Energy, Technical University of Denmark 02 October 2017
WP2 – Voltage Control Support
Objectives
– to identify voltage control challenges related to the accommodation of large penetration of ReGen plants
– to develop controllers with the specific aim of supporting voltage stability
– to analyze the suitability for a coordinated voltage control support from WPs and PVs
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DTU Wind Energy, Technical University of Denmark 02 October 2017
WP2 – Voltage Control Support
Results of WP2
– voltage sensitivity analysis to quantify voltage variations due to injections of active and reactive power
– development and evaluation of the voltage control concepts using the voltage sensitivity analysis
– impact analysis of communication properties on voltage control coordination
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DTU Wind Energy, Technical University of Denmark 02 October 2017
WP3 – Frequency Control Support
Objectives
– to identify frequency control challenges related to the accommodation of large penetration of ReGen plants
– to develop controllers with the specific aim of supporting frequency stability
– to analyze the suitability for a coordinated frequency control support from WPs and PVs
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Σ
Steam Power Plants
Hydropower Plants
Disturbance ΣSingle-Bus
(Aggregated Inertia)
∆Pdisturbance
∆Pgeneration
+-
∆f
Nuclear Power Plants
Wind Power Plants 1
Wind Power Plants 2
Wind Power Plants 3
Σ PWPPtotal
DTU Wind Energy, Technical University of Denmark 02 October 2017
WP3 – Frequency Control Support
Results of WP3
– investigation of wind turbines’ overproduction capability and development of optimization approaches for different wind speeds
– coordination of WPPs’ inertial response using an optimization method
– development of a statistical online decision making method for secondary frequency control
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Aggregator real-time control
center
Regulation signals r
Psch,1+r*Pres,1
10 mins 10 mins 10 mins
WPPController
Psch,2+r*Pres,2
SPPController
Regulation signals r
Pmeas,1
Pmeas,2
10 mins
PW
PP [
pu]
Inertial Response
Secondary Frequency Control
DTU Wind Energy, Technical University of Denmark 02 October 2017
WP4 – Rotor Angle Stability Support (ongoing)
Objectives
– to identify frequency control challenges related to the accommodation of large penetration of ReGen plants
– to develop controllers with the specific aim of supporting frequency stability
– to analyze the suitability for a coordinated frequency control support from WPs and PVs
Expected Results
– rotor angular stability support controllers for WP and PV plants
– coordinated control from WP and PV plants to support strategy from WP and PV plants rotor angular stability
– assessment of the coordinated control from ReGen plants to support rotor angular stability
– guidelines and recommendations for communication technologies that can provide coordinated control rotor angular stability support from WP and PV plants
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DTU Wind Energy, Technical University of Denmark 02 October 2017
WP5 – Verification of Voltage and Frequency Control Support
Objectives
– to verify the capability of ReGen plants (WP and PV) to provide ancillary services to system operators both on a large scale and a small scale power system
– Two different laboratory facilities used for the validation of the control algorithms:
• Real-Time Hardware-in-the-Loop (HIL) environment based on multi-domain physical systems
• SYSLAB facility existing in the DTU Risø Campus
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SYSLAB facility
Smart Energy Systems Laboratory
HV Transmission System
MV Distribution System
LV Distribution System
CommunicationNetworks
(Topology, Traffic, Security, GIS)
Real-Time Digital Simulator
DSO ControlCentre
Aggregator/Retailer
PrimarySubstation
Control
RenewablePlant
Control 10.000 buses
TSO ControlCentre
DTU Wind Energy, Technical University of Denmark 02 October 2017
Questions
Thank you for your attention
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