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Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
1
Analysis and tools to support energy system transitionKnowledge-exchange between US and German power system operators
Philipp Härtel, Dr. Malte Siefert, Denis Mende Energy Economy and Grid Operation, Fraunhofer Institute for Wind Energy and Energy System Technology (IWES)
Delegation Trip to GermanyBerlin, September 28, 2017
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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Agenda
I What is Fraunhofer-Gesellschaft and Fraunhofer IWES?
II Developing Long-Term Scenarios with High Levels of Decarbonisation (Philipp Härtel)
III Current Challenges of the Integration of Large Amounts of Wind and Solar Power (Dr. Malte Siefert)
IV Technical Challenges and Prospects in Power Systems with High Penetration of Renewable Energies (Denis Mende)
V Training and Knowledge Transfer at Fraunhofer IWES
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
3
Agenda
I What is Fraunhofer-Gesellschaft and Fraunhofer IWES?
II Developing Long-Term Scenarios with High Levels of Decarbonisation
III Current Challenges of the Integration of Large Amounts of Wind and Solar Power
IV Technical Challenges and Prospects in Power Systems with High Penetration of Renewable Energies
V Training and Knowledge Transfer at Fraunhofer IWES
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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Europe‘s largest applied research organisation
Undertakes research for direct use by private and public enterprises, providing a wide range of benefits to society
80 research units, including 66 Fraunhofer Institutes
Staff of around 24,500
Annual research budget of around 2.1 bnEUR
Fraunhofer-Gesellschaft conducts applied research and comprises 66 institutes across Germany
München
Holzkirchen
Freiburg
Efringen-Kirchen
FreisingStuttgart
PfinztalKarlsruheSaarbrücken
St. Ingbert Kaiserslautern
DarmstadtWürzburg
Erlangen
Nürnberg
Ilmenau
Schkopau
Teltow
Oberhausen
Duisburg
EuskirchenAachen St. AugustinSchmallenberg
Dortmund
PotsdamBerlin
RostockLübeck
Itzehoe
Braunschweig
Hannover
Bremen
Bremerhaven
Jena
Leipzig
Chemnitz
Dresden
CottbusMagdeburg
Halle
Fürth
Wachtberg
Ettlingen
Holzen
Kassel
Fraunhofer-Gesellschaft
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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Fraunhofer has several locations and contact possibilities worldwide
Salvador
São Paulo
Santiago de Chile
Pretoria
Stellenbosch
CairoLavon
Bangalore
Jakarta
Singapore
OsakaTokyoSendai
GlasgowDublin
Brussels
Porto
Bolzano
ViennaBudapest
Graz
Enschede
BostonPlymouthEast Lansing
NewarkStorrs
LondonHamilton
Ulsan
Auckland
Kuala Lumpur
Nijmegen
SeoulBeijing
Campinas
San José
Jerusalem
GothenburgStockholm
Subsidiary Center Project Center ICON / Strategic cooperation Representative / Marketing Office Senior Advisor
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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The Energy System Technology branch of Fraunhofer IWES is located in Kassel
Our service portfolio deals with current and future challenges faced by the energy industry and energy system technology issues.
We explore and develop solutions for sustainably transforming renewable based energy systems.
Personal: approx. 310
Annual budget: approx. 22 Mio EUR
Director: Prof. Dr. Clemens Hoffmann
www.energiesystemtechnik.iwes.fraunhofer.de
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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We research and develop solutions in different fields of expertise
Device and System Technology
Electrical Grids
Energy Process Engineering
Energy Economics and System Design
Energy Meteorology and Renewable Resources
EnergyInformatics
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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Energy System Technology
Power electronics and devices
Grid planning and operation
Measurement and test services
Decentralised energy management
Hardware-in-the-loop systems
Systems engineering
Energy Economics
Energy meteorological information systems
Consulting and analyses in energy economics
Virtual power plants
LiDAR Wind measurements
Training and knowledge transfer
Energy Economics and Energy System Technology are our two business areas
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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Agenda
I What is Fraunhofer-Gesellschaft and Fraunhofer IWES?
II Developing Long-Term Scenarios with High Levels of Decarbonisation (Philipp Härtel)
III Current Challenges of the Integration of Large Amounts of Wind and Solar Power
IV Technical Challenges and Prospects in Power Systems with High Penetration of Renewable Energies
V Training and Knowledge Transfer at Fraunhofer IWES
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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Energy Economy and System Analysis Group at Fraunhofer IWES mainly answers its research questions with the SCOPE model family
Dynamic simulation of power markets in Germany and Europe
Scenario development for energy system transformation towards decarbonisation
Technology evaluations in future energy markets (particularly. at sector coupling interfaces power – heat und power - mobility)
Grid and storage expansion analyses
Research focus
Current projects
North Seas Offshore Network (NSON-DE), BMWi, 2014 – 2017
Treibhausgasneutrales Deutschland, UBA, 2016 – 2018
Klimawirksamkeit Elektromobilität, BMUB, 2016 – 2018http://publica.fraunhofer.de/documents/N-439079.html
Wärmewende 2030, AGORA, 2016http://bit.ly/2kDMHst
Interaktion EE-Strom-Wärme-Verkehr, BMWi, 2012-2015http://publica.fraunhofer.de/documents/N-356297.html
SCOPE model family
Sector-wide dispatch and expansion planning model for analyses of future energy supply systems
Modular and customisable techno-economic fundamental market model with various configurationse.g. block-specific unit commitment (day-ahead, balancing reserve),Expansion planning of grids and units (TEP/ GEP)
Implemented in MATLAB, solved by IBM ILOG CPLEX on IWES-owned High-Performance Computing Cluster
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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Long-term climate targets are very ambitious and decarbonisation challenges the energy sectors –promising solution via sector coupling technologies based on wind and solar power
1) Land use, land-use change and forestry (LULUCF)
-200
0
200
400
600
800
1000
1200International transport
LULUCF1)
Energy sector
Domestic transport
Industry heat
Building heat
Power sector
Non-energy emissions
Historical
2010 2011 2012 2013 2014 2050 2050
Target
-80%
vs.
199
0 le
vels
-95%
vs.
199
0 le
vels
Emis
sion
sin
Mio
. ton
nes
CO
2eq.
Germany
Complying with COP21 Paris agreement requires emissionreductions in the range of 80-95% vs. 1990 levels,
implying consequences for the energy sector:
Power Heat Transport
Coupling of energy sectors with key technologies to use renewable power generation (i.e. wind and solar)
as the main primary energy source in the future
Cha
lleng
eSo
lutio
n
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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Heat pumps and electric vehicles are key technologies for coupling of energy sectors – they increase the energy efficiency and substitute fossil fuels
Power Heat Transport
Toda
yTo
mor
row
Fuel
Power
Losses
Fossil fuel power plantEfficiency 40%
Renewable power
Power
Wind and solar energyEfficiency 100%
FuelHeat
Losses
Gas fired boilerEfficiency 85%
Renewable Power
Heat
Losses
Heat pumpEfficiency 340%
External environment
heat
Fuel
Driving power
Losses
Internal combustion engineEfficiency 25-40%
Driving power
Electric powertrainEfficiency 80%
Renewable Power
Losses
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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One SCOPE configuration serves the development of cost-optimised target scenarios of future energy systems with energy and emission targets
1) Static and deterministic Generation Expansion Planning (GEP) model.
Europe and/ or Germany
Objective is tominimise investment and
system operation cost
subject to compliance withclimate protection targets
full consecutive year, hourly resolution (8760h)
historical climate reference years
Linear Optimization Model (LP)1)
Optimised power generation mix
Optimised heat generation mix
Optimised transport mix
Energy framework and installed capacities
CO2 emission price(s)
…
Output data
Fuel cost
Technology cost
Potentials and restrictions
Energy demand time series (power, heat, industry, transport)
Technology-specific time series (wind, solar, natural inflow, COP, solar thermal, …)
Input data
Markets
Power marketHeat markets
(various building types and temperatures)
Gas markets(national/ international)
Mobility demandCO2 markets
(national/ international, sector-specific)
Technology options
Wind, Solar Energy storage Power-to-Gas BEV PHEV/ REEV
Hydro power Cogeneration Cooling process Boiler Electric truck (OHL)
Condensing Plant Power-to-Heat Heat pump Solar thermal Geothermal
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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Consumption Generation0
100
200
300
400
500
600
700
800
900
Power sector sees higher volumes as it is expected to supply the heat and transport sector in order to fulfil climate targets in the overall energy sector (-87.5% carbon emissions vs. 1990 level)
Conventional
Power-to-HeatCentralised/ industry heat pumps
Heat pumps (decentralised)
BEV/ PHEV/ REEV
Electric trucks
Air conditioning
Other
Hydro (ROTR, CHS, PHS)
Onshore wind(strong + low wind turbines)
Solar PV(rooftop + utility-scale)
Offshore wind
Waste and sewage
CHP (Cogeneration CCGT)
Net importCurtailment
Add
ition
al p
ower
dem
and
Power demand increases due to
new consumption from heat and
transport sector
Renewable energy generation is the main source of energy
with only limited generation from conventional power plants
GermanyNSON 2050
Target scenario
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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Exemplary week shows integration of renewable energy production through sector coupling –heat and transport sector introduce flexibility and directly use electricity
EXEMPLARY
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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A similar pattern becomes visible for the other market areas in Europe – conventional generation is reduced to natural gas (mainly CHP) and existing nuclear plants by 2050
AUT BEL CHE CZE DEU DNK ESP FIN FRA GBR HUN IRL ITA LUX NLD NOR POL PRT SVK SVN SWE-1000
-800
-600
-400
-200
0
200
400
600
800
1000
Generation/ Import/ Curtailment
Consumption/ Export/ Losses
CurtailmentNet importCHPCCGTOCGTWaste/ GeothermalHydroOnshore windOffshore windSolar PVConventionalPower-to-GasPower-to-Heat/ Industry-HPHeat pumpsAir conditioningBEV, PHEV, REEVElectric trucksStorage lossesNet exportGrid losses
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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Long-term scenarios with high levels of decarbonisation bring along challenges for planning tools which are designed to investigate more specific subjects
Multi Market Area Dispatch and Offshore Grid Expansion Model
Onshore market area
Load coverage of residual load
Technical restrictions of the hydro-thermal plants
Technical restrictions of other flexibility options (e.g. as battery storage, flexible CHP, electric mobility)
Offshore grid region (area)
Load coverage/ node balance of offshore hubs with wind generation/ curtailment/ storage
Investment decision variables in offshore grid infrastructure
Power exchange between areas
Im-/ export between onshore market areas
Im-/ export between onshore market areas and offshore grid region
Omitting sector coupling and its interaction in planning tools focussing on e.g. offshore grid investments is not an option
Modelling (and solution) challenges are amplified even more
18.06 [26]
11.8
6 [1
7]
9.10 [13]
38.50
[55]
2.62 [4]
1.52 [3]
18.70 [27]
2.99 [5] 3.53 [6]
8.40 [12]
4.11 [6]
6.15 [9]
3.50
[5]
3.50 [5]
1.40 [-]
1.40 [-]
1.40 [
-]
1.00 [-]
1.00
[-]
1.40 [-]
1.40 [-]
1.40 [-]
1.40 [
-]
1.40 [-]
1.40 [-]
0
60 N Schematic
EXEMPLARY
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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Key messages regarding long-term energy scenario development in Germany and Europe
Focus used to be on reaching renewable shares in the traditional power sector and making use of surplus energy
Coupling the traditional power sector with heat / industry / transport sectors is crucial to decarbonise the energy supply system and
comply with climate targets
Generation from wind and solar will be the main source of energy as simulations show its feasibility and LCOE are continuing to go down
Current alternatives expected to play a complementary roleBiomass, solar thermal, geothermal
Challenges for power system planning and operation models to adequately address future system flexibility
from a methodological perspective
Technology efficiency is still an important issuealthough there are good wind and solar potentials across Europe,
but social acceptance imposes limits
High efficiency sector coupling technologies already relevant todaysuch as heat pumps & electric vehicles
Low efficiency sector coupling technologies become relevant in the long-termsuch as Power-to-Heat & Power-to-Gas
Flexibility of the new consumers is assumed as a givenimplying that they see some kind of flexibility signal
European balancing via the electricity market is a vital assumptionas it facilitates significant balancing between regions
Installed capacities are optimised to the absolute minimumby the deterministic generation expansion planning model
(particularly conventional generation capacities)
Presented scenario is to be seen as a lower boundsince e.g. balancing reserve markets are not included
Limitations and assumptions:
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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Agenda
I What is Fraunhofer-Gesellschaft and Fraunhofer IWES?
II Developing Long-Term Scenarios with High Levels of Decarbonisation
III Current Challenges of the Integration of Large Amounts of Wind and Solar Power (Dr. Malte Siefert)
IV Technical Challenges and Prospects in Power Systems with High Penetration of Renewable Energies
V Training and Knowledge Transfer at Fraunhofer IWES
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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CURRENT CHALLENGES OF THE INTEGRATION OF LARGE AMOUNTS OF WIND AND SOLAR POWER
Malte Siefert
Virtual Power Plant RES Forecast
time
po
wer
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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Introduction - German power system
2025~40%
2035~55%
2050>80%
Top-down Optimization Bottom-up
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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Renewables replaces conventional power production
Intermittent character of wind and PV Grid operation more sophisticated Resource planning more sophisticated
Security of supply Balancing of supply and demand Grid security
Ancillary services from RES reactive power (voltage stability) control reserve (frequency stabilization)
Holistic view on energy system Activation of flexibility sector coupling
Introduction - The Challenges
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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VIRTUAL POWER PLANT– RENEWABLE ENERGY PRODUCTION OF THE FUTURE
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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Introduction – New role portfolio manager (Energy trade)
TSO
DSO A
DSO B
Feed‐in tariff
380/220 kV
110 kV
110 kV
Feed‐in tariff
Portfolio
Roles: TSO, DSO, customer, plant operator, RE plant operator, energy trader
VPP operator
manages portfolio
Use cases
energy trading (CVPP)
grid support (TVPP)
Benefits
Data ownership
Portfolio optimization
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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Virtual Power Plant (VPP) - Definition
“A virtual power plant is a cluster of dispersed generator units, controllable loads and storages systems, aggregated in order to operate as a unique power plant. The generators can use both fossil and renewable energy source. The heart of a VPP is an energy management system (EMS) which coordinates the power flows coming from the generators, controllable loads and storages. The communication is bidirectional, so that the VPP can not only receive information about the current status of each unit, but it can also send the signals to control the objects.”
Source: Virtual Power Plant (VPP), Definition, Concept, Components and Types, Saboori, 2011, IEEE
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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Virtual Power Plant (VPP) - Architecture
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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Virtual Power Plant (VPP) – Aggregation level
Communication interface Standardization useful and needed
Communication protocols TCP/IP based
Communication technologies DSL, LTE, GSM, satellite communication
Communication security VPN Web security closed user groups point to point connections
Typical requested data
P, Q, storage, weather information, possible power feed-in
Bidirectional connection, push/pull
photovoltaic plantsOPC DA Server
CHPVHP Ready
Biogas plantsIEC 60870-5-104
wind farms OPC DA Server
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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Virtual Power Plant (VPP) – Business logic level
Metering interface to portfolio
Database
Business logic-kernel Optimization of business cases
Unit commitment Calculation of schedules Calculating of operating points
Interfaces to external IT-infrastructure, Interface to portfolio
Database
Exte
rnal
sys
tem
s
Unit commitment
Business logic-kernel
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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Virtual Power Plant (VPP) – Integration level
Graphical user interfaces
Monitoring systems
External IT systems Customer dependent (In case of utility SAP for
accounting, etc.)
Forecast systems Power feed-in from fluctuating sources, load forecasts price forecasts for different markets External trading systems
Grid operation State information requests for control reserve power
Graphical user interface
Redundant
vpp
Gri
d o
per
atio
n
External IT
Forecast systems
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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Virtual Power Plant (VPP) – Relevant research and cooperation projects (examples)
VPP as a substitution of conventional power plants
(European research – FENIX,)
Control reserve power with wind and PV,
Optimization of revenues
(National funded research – ReWP)
Aggregation of 700 MW renewable energies
Portfolio in Germany
(Cooperation – ARGE-Netz GmbH)
Conceptualization of a Virtual Power Plant (VPP) in India
(International research/cooperation with ICF)
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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FORECAST SYSTEMS FOR THE INTEGRATION OF LARGE AMOUNTS OF WIND AND SOLAR POWER
Projects:
EWeLiNE (2013-2017)
Gridcast (2017-2021)
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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Cooperation between weather service and network operators
Seite 32
weather forecast power forecast application of power forecast
Francis McLloyd
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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Improvements along the whole forecast chain
assimilation Weatherforecast
Post processing
Powerforecast
Postprocessing application
Seite 33
DWD DWD Francis McLloyd
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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Problem description
RES forecast for congestion forecast becomes one of the most important forecast for TSO in Germany
Operational planning: forecasting the future system state + actions
System state parameters: node voltage and branch current
Risks can be captured with uncertainty information (risk for (n-1)-violation)
Further Need: operational planning process which is capable of integrating uncertainties
→
→
→
PV
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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Most of the RES plants are connected to DSO-level
DSO DSO
~
TSO TSO
PV PV
~ ~
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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The challenge
1. Estimating the actual RES feed-in into transformer stations
2. Forecasting the RES feed-in into transformer stations
3. Estimating the reduced production of RES plants
4. Improved allocation of RES plants to transformer stations and integration of the grid sate
5. Quantification of the forecast uncertainties
6. Testing the results by functional models
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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Uncertainty Forecast for Congestion Management
1345 1350 1355 1360 1365 1370 1375 1380 1385 1390 13950
5
10
15
20
25
30
35
40
45
50calibrated ensemble
Zeit
Leis
tung
Thermal overload?
Deterministic forecast: „No“.
Reality: „Yes“. Ensemble recognize possible overload.
Overloaded with 30% probability
Overload not recognized
Zeit
Pow
er
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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→
→
N=3
One congestion forecast for each scenario estimation of critical system states
→
→
→
PV
N=1
→
→
→
PV
→
→
→
PV
N=2 N=3
Cri
tica
l sta
te
Cri
tial
stat
e
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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Our research results are proven in practice
Forecast Systems
Fraunhofer is Europe’s largest application-oriented research organization.
Virtual Power Plant
© Fraunhofer IWES
www.energiesystemtechnik.iwes.fraunhofer.de
Agenda
I What is Fraunhofer-Gesellschaft and Fraunhofer IWES?
II Developing Long-Term Scenarios with High Levels of Decarbonisation
III Current Challenges of the Integration of Large Amounts of Wind and Solar Power
IV Technical Challenges and Prospects in Power Systems with High Penetration of Renewable Energies (Denis Mende)
V Training and Knowledge Transfer at Fraunhofer IWES
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
41
Installed capacity Power supply (August 2017)
Installed capacity of renewables sharply increased in recent years
Installed capacity constant respectively slightly decreasing (changing to cold reserve)
Varying share of renewables in power supply due to intermittend primary resources
Renewables in the German power system
Source: https://www.energy-charts.de. Accessed September 25, 2017.
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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System services classically provided by conventional power plants, but oftentimes not yet required by RES
RES need to participate in system services to keep system qualities up
System ancillary services – classical provision and new challenges
Source: dena Ancillary Services Study 2030. https://www.dena.de/en/topics-projects/projects/energy-systems/dena-ancillary-services-study-2030. Accessed September 25, 2017.
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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Frequency control in power systems with high penetration of renewables (I/III)
Source: According to https://commons.wikimedia.org/wiki/File:Schema_Einsatz_von_Regelleistung.png. Accessed September 25, 2017. Own drawings.
Frequency control ensured by conventional generators
Rotating masses lead to instantaneous frequency support
Primary control ensures new stable operating point due to increased power output
Further control leads to constant frequency at nominal value
RES decoupled from grid frequency due to inverter-based grid connection
No direct coupling to frequency
Only over-frequency support (reduction of power)
Under-frequency support would mean active power reserves
Investigations on frequency control and frequency supporting functionalities become more and more essential
Examples
Demonstration of control reserve with renewables: Project Combined Power Plants: http://www.kombikraftwerk.de
Challenges in grid modeling (next slide)
Frequency supporting functionalities (inertia & primary control) in wind turbines (2 slides ahead)
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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Above
Middle - 12 „balancing“ models with tie lines and enhanced
Below - 12 „balancing“ models with tie lines and enhancedmodeling
- 10 % inertial generation
Frequency control in power systems with high penetration of renewables (II/III)
Pictures from: Schittek: Augmented block diagram model for investigating primary-control performance at low inertia, Master's thesis, Fraunhofer IWES, 2017. In Progress.
Challenges in power system modeling
Example
Reduced inertia leads to increased requirements to power system models
Balancing model vs. enhanced modelling of large power systems
Reduced system inertia calls for enhanced models and newmodeling concepts
Balancing model (one rotating mass, no tie lines)
12 „balancing“ models with tie lines and enhancedmodeling (rotor angle, …)
50 % inertial generation
12 „balancing“ models with tie lines and enhancedmodeling (rotor angle, …)
10 % inertial generation
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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measp
refp
RSCrefp
1s11
T
ref
TTk
s1sdf
dfdfp
gridf
minp
maxp
min
max
min
max
maxpmaxp
minpminp
0,94
0,96
0,98
1,00
0 20 40 60 80 100 120
f (p
u)
GenStatGenDFIGres
600
650
700
750
0 20 40 60 80 100 120
P (M
W)
GenStatGenDFIGres
Frequency control in power systems with high penetration of renewables (III/III)
See also: Mende, Hennig, Akbulut, Becker, Hofmann: Dynamic Frequency Support with DFIG Wind Turbines – A System Study‘, IEEE EPEC, Ottawa, 2016. DOI: 10.1109/EPEC.2016.7771694.
Frequency supporting functionalities of RES
Modelling of wind turbines with frequency supporting functionalities (FSF)
Study cases in power system models
Example: IEEE 39 bus system, Generator outage, RES w/o FSF (StatGen, DFIGres)
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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Optimized grid operation in power systems with high penetration of renewables (I/III)
New challenges in grid operation due to increased flexibility ofgeneration and demand
Volatile RES generation profiles
Changing power flow patterns
Increased ramping requirements (e.g. as known in the US as„Duck curve“)
Increased demands on coordination between TSO & DSO due tochanged generation location
wind on HV-level
solar pv on MV- and especially LV-level
Optimization approaches allow facing different challenges
Example:Implementation of optimization algorithms in flexible modules to withpossibility of result validation
Network modeling (PowerFactory)
Scenario / Sensitivity generator (MatLab / Matpower)
Optimization environment (GAMS)
enhancedMatpower /
MPC-format
IWES.WCMS /
IWES.Redispatch
(GAMS)
IWES.GridMod
(PowerFactory)
IWES.Scenario /
IWES.Sens
(MatLab)
Network Modeling• Modeling of network• Power flow calculation &
further analysis methods• Visualization
Topology data
Scenario & sensitivitygenerator
• Feed-in and load situation• Neigbouring grid parameter• Power flow sensitivities• Optimization goals
Optimizationdata
Optimization• Solving of the optimization
problem• Reactive power control.,
voltage profile, losses, …• Active power distribution
Validation
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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Optimized grid operation in power systems with high penetration of renewables (II/III)
Pictures from: Sala: Optimal Reactive Power Management of Wind Farms for Coordinated TSO-DSO Voltage Control, Master’s thesis, Fraunhofer IWES, 2017. In Progress.
Example:Increased demands on optimization and coordination between TSO & DSO due to changed generation location
Implementation of optimization tool to coordinate andenhance TSO-DSO-interface
Optimization on DSO-level to provide flexibility potential at interface to TSO
Optimization on TSO-level using own and TSO-flexibilitiesand giving setpoints to DSO
DSO uses RES flexibilities to provide setpoints and newflexibility potentials
Study case
Larger DSO area in northern Germany with high share ofRES
(Part of) Northern Germany Transmission Grid
Reactive power provision in given limits using different approaches
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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Conventional
Incl. assumedwind generators
Comparison
Optimized grid operation in power systems with high penetration of renewables (III/III)
See also: Akbulut, Mende: Congestion Management Strategy in Combined Future AC/DC System, Fraunhofer IWES, 2017. In: IRP-Wind: Deliverable 81.5 – Congestion Management in combined future AC/DC System.
European liberalized energy market
Energy trading doesn‘t take grid restrictions into account „Trading on a copper plate“
Possibility of large power transmission needs
RES often far away from load centers
RES installation in rural areas with low load
Example: Offshore wind energy
Modular optimization tool to find optimal solution for „re-dispatching“ power plants
Optimization of costs, powers or multiobbjective goalsincluding several optimization criteria
Possibility to freely include flexibilities of generation andload units
Example:
Redispatch according to overloading of lines
Scenario w/o incorporating wind power plants
Redispatched powers (tech), costs (eco) and combinedoptimization using normalization approach (norm)
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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Restoration in power systems with high penetration of renewables
See also: https://www.energiesystemtechnik.iwes.fraunhofer.de/de/projekte/suche/laufende/Netzkraft.html. Accessed on September 25, 2017.
Integration of renewable generators in system restoration concepts: Project Netz:Kraft
Classical restoration
Opening and enhancing grid island
Start of large conventional power plants
Provision of loads
RES not considered in restoration concepts or are strictlylimited/shut down
Enhanced concepts including RES
Integration of renewable generators in system restorationconcepts
Improved planning using forecasts (renewables and load)
Increased flexibility and possibilities through frequencysupporting functionalities and reactive power capabilities ofmodern renewable generators
Increasing of robustness of restoration paths
Concepts for system restoration
(conventional) black startunits
Large (conventionalthermal) blocks
Loads
Concepts for system restoration with RES
(conventional) black startunits
Large (conventionalthermal) blocks
Loads
Renewablegenerators
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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Test- and simulation-environment for grid control and aggregation strategies
Applications ranging from developing prototype controllers to testing operative control software in the smart grid domain
Features
APIs to connect various simulation tools such as Opal-RT, pandapower, PYPOWER, MATPOWER or custom scripts in Matlab, Java and Python.
Standard interfaces: VHPready, CIM and IEC 61850.
Scalable environment - runs on desktop PCs and clusters.
Interfaces for hardware-in-the-loop (HIL) tests.
Example
Implementationof DSO / TSOoperation center
Further Information
www.OpSim.net
Demonstration of solutions - OpSim
See also: www.OpSim.net
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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Integration of renewable generators in system restoration concepts
Increasing of flexibility and robustness of restoration paths
Using frequency supporting functionalities and reactive power capabilities of RES
Summary
Transition in electrical energy systems lead to various challenges
Sharp increase in installations as well as in power provision
Varying penetration of renewables & conventional generation
Renewables need to participate in system services such as
frequency control voltage control
system operation system restoration
Frequency control as challenge due to reduced rotating masses
Challenges for modelling
Frequency supporting functionalities and power reserves by RES
Optimization and coordination at the interface of DSO / TSO
Flexible optimization implementations and algorithms
Improved solutions in grid operation and congestion management
Demonstration of system operation strategies and optimizationalgorithms
OpSim environment
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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Agenda
I What is Fraunhofer-Gesellschaft and Fraunhofer IWES?
II Developing Long-Term Scenarios with High Levels of Decarbonisation
III Current Challenges of the Integration of Large Amounts of Wind and Solar Power
IV Technical Challenges and Prospects in Power Systems with High Penetration of Renewable Energies
V Training and Knowledge Transfer at Fraunhofer IWES
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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Training and Knowledge Transfer at Fraunhofer IWES (I/II)
We offer our "know-how pool" in different arrangements.
Our target groups include decision-makers, specialists and executives from business and administration as well as students.
With our IWES experts and with our broad network of experts from industry, consulting and universities, we provide basic and detailed knowledge on the use of renewable energies.
Characteristics National as well as international trainings / workshops
Day or week seminars regarding various aspects of renewable energy sources
Online master program and certificate programs Wind Energy Systems
Customer-oriented specific trainings on demand
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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Training and Knowledge Transfer at Fraunhofer IWES (II/II)
Example: Online-training for engineers of TSOs Wind and Solar Energy Sources Integration in Power Systems
6 Modules
50 lessons
Introduction: Basic Concepts of Wind and
Solar PV Energy
Wind and Solar PV Forecasting
Planning considering Wind and Solar PVPower Integration
Long-Term Planning
Market Models and System Balancing
Operational Analysis
4 lessons 6 lessons 12 lessons 10 lessons
10 lessons 8 lessons
Homework
Certificate
Exam
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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Thank you very much for your attention!
I What is Fraunhofer-Gesellschaft and Fraunhofer IWES?
II Developing Long-Term Scenarios with High Levels of Decarbonisation (Philipp Härtel)
III Current Challenges of the Integration of Large Amounts of Wind and Solar Power (Dr. Malte Siefert)
IV Technical Challenges and Prospects in Power Systems with High Penetration of Renewable Energies (Denis Mende)
V Training and Knowledge Transfer at Fraunhofer IWES
Härtel, P., Siefert, M., Mende, D., Berlin, September 28, 2017© Fraunhofer IWES
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Thank you very much for your attention!
M.Sc. Philipp HärtelEnergy Economy and Grid OperationFraunhofer Institute for Wind Energy and EnergySystem Technology IWES
Königstor 59 | 34119 KasselPhone +49 561 7294-471 | Fax +49 561 [email protected]
Dr. Malte SiefertEnergy Economy and Grid OperationFraunhofer Institute for Wind Energy and EnergySystem Technology IWES
Königstor 59 | 34119 KasselTelefon +49 561 7294-457 | Fax +49 561 [email protected]
Dipl.-Ing. Denis MendeEnergy Economy and Grid OperationFraunhofer Institute for Wind Energy and EnergySystem Technology IWES
Königstor 59 | 34119 KasselTelefon +49 561 7294-425 | Fax +49 561 [email protected]