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© Fraunhofer IWES
Slide -1- Ron Brandl Project: DEAstabil
Multi-Terminal Power Hardware-in-the-Loop
Test-Bench for Power System Stability
Analyses Focused on Distributed Generation
RT15
Berkeley, CA | 13 - 14 June, 2015
Authors: Ron Brandl, Fraunhofer IWES
Dominik Geibel, Fraunhofer IWES
© Fraunhofer IWES
Slide -2- Ron Brandl, Project: DEAstabil
Multi-Terminal PHIL Test Bench for Power
System Stability Analyses
Content
1. Introduction
2. Power System Stability (PSS)
3. Simulation Environment
4. Hardware Environment
5. Power Hardware-in-the-Loop (PHIL) Simulation
6. Conclusion
© Fraunhofer IWES
Slide -3- Ron Brandl Project: DEAstabil
1. Introduction
Motivation
Large increase in inverter-coupled generating units
In Germany over 50% of power generation is from PV and wind at certain times
Change of future network
Loss of spinning reserves
Decentralization of power production
Future mix of power plant park will
be inverter-dominated
Power system stability (PSS)
has to be assured
Transformation to inverter-dominated networks
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Conventional Production > 100MW Wind Solar
18th April 2013 in Germany
© Fraunhofer IWES
Slide -4- Ron Brandl Project: DEAstabil
2. Power System Stability
Conventional PSS
Focused on rotating generators
Rotor angle stability
Frequency stability
Voltage stability
Reconsideration of conventional
stability assessment Source: Definition and Classification of Power System Stability, IEEE/CIGRE Joint
Task Force, P. Kundur et. al.
Definition of Stability
© Fraunhofer IWES
Slide -5- Ron Brandl Project: DEAstabil
2. Power System Stability
Factors for network imbalance
Failure/blackout of
central power plants
large loads
transmission line
HVDC terminals
Switching operations on transmission network
Weather influence
Change of active coupling points of the interconnection to boundary networks
Scenarios for different PSS disturbances
© Fraunhofer IWES
Slide -7- Ron Brandl Project: DEAstabil
3. Simulation Environment
Intention of new simulation
platform
Holistic simulation of transmission
and distribution network for stability
studies
Include dynamics of decentralized
generators in the distribution
network
Ability to conduct real-time
simulations, esp. PHIL simulations
Evaluation of the future needs of
the power system, with increasing
inverter-based generation, on a
scientific basis
Motivation
© Fraunhofer IWES
Slide -8- Ron Brandl Project: DEAstabil
3. Simulation Environment
German interconnection network
Holistic stability analyses required
>> 100.000 nodes and machines from
high voltage down to low voltage level
Handling
Aggregated models of distribution
networks with dynamic behaviors
Development of models ≤ 110 kV
which are scalable and containing the
influence of distribution generators
Verification of network models based
on available data of real network
disturbance
Dynamic Model of Distribution Networks
© Fraunhofer IWES
Slide -9- Ron Brandl Project: DEAstabil
3. Simulation Environment
Benefits/Summary
Advantage
Use of self-made simulation models
Access to calculation equations and simulation routine
Challenges
Development of a holistic interconnection network simulation
Real-time capability and compatibility with real-time products
Parallel simulation on different cores is necessary, due to high numbers of nodes
General Benefits
Flexibility total access for developer possible
Scalability Level of detail user defined
Expansion to new research fields
© Fraunhofer IWES
Slide -10- Ron Brandl Project: DEAstabil
4. Hardware Environment
Laboratory Test bench
Power Hardware-in-the-Loop test bench
Development, construction and operation
of PHIL test Bench
Demonstration of the contribution of
distributed generators (DER) to power
system stability in a laboratory environment
Verification of the influence of power-
stabilizing control method from inverter-
based generators by coupling real-time
simulations with larger transmission and
distribution networks
© Fraunhofer IWES
Slide -11- Ron Brandl Project: DEAstabil
4. Hardware Environment
Laboratory (under preparation)
Systec Laboratory, Fraunhofer IWES
Power Hardware-in-the-Loop test bench
Ametek, Power amplifier, 3x 3phase 90 kVA (single/parallel operation)
Scienlab, DC-source (battery emulator), 290 kW
TriPhase, DC-DC-AC inverter, 2x 15 kVA
© Fraunhofer IWES
Slide -12- Ron Brandl Project: DEAstabil
5. Power Hardware-in-the-Loop Simulation
Benefits/Summary
Intention of Power Hardware-in-the-Loop simulation
Integration of „black box“ devices for stability support (e.g. converters)
Level of detail increased due to use of the real hardware in comparison to software
models
All effects of the hardware can be monitored
© Fraunhofer IWES
Slide -13- Ron Brandl Project: DEAstabil
5. Power Hardware-in-the-Loop Simulation
Network Simulation Scheme
German interconnection
network
Transmission level
2.000 nodes
1.000 machine
Distribution level
Aggregated models
4.500 active nodes
4.000 machines
Connection point HUT
Current feedback circuit
© Fraunhofer IWES
Slide -14- Ron Brandl Project: DEAstabil
5. Power Hardware-in-the-Loop Simulation
Simulation platform
Controlled execution
Higher-ranked phasor simulation
Transmission network simulation
Adaption/Integration of self-made
models
Classified aggregated distribution
network
Distributed generator
Wind park
Photovoltaic system
CHPs
HVDC link
…
© Fraunhofer IWES
Slide -15- Ron Brandl Project: DEAstabil
6. Conclusion
Summary
Summary
Reconsideration of power system stability
Focusing of inverter-dominated generators in future
Creating of holistic network simulation for stability analyses
Scenarios of conventional PSS
Research of new/upcoming PSS
Power Hardware-in-the-Loop
Laboratory Test – “Black Box” or self-programmed inverter testing
Outlook
Network simulation for stability studies
Development of new control strategies for DER
Advanced test platform for DER
© Fraunhofer IWES
Slide -16- Ron Brandl Project: DEAstabil
Thanks for your attention
Ron Brandl
Fraunhofer Intitute of Wind Energy and Energy System Technologies
Koenigstor 59
34119 Kassel/Germany
Acknowledgement
We acknowledge the support of our work by the
German Ministry for the Environment, Nature and
Nuclear Safety and the Projekträger Jülich within
the project “DEA-Stabil: Beitrag der Windenergie
und Photovoltaik im Verteilungsnetz zur Stabilität
des deutschen Verbundnetzes” (FKZ 0325585).