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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