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Voltage distribution (400 kV) – scenario 1
Scenario 1.a (2011): Voltages within limits
Scenario 1.b (2015): Severe voltage drop in
western region Additional measures
necessary, Redispatch actions
Scenario 1.c (2020): Severe voltage drop in
Western and Southern region Additional measures
necessary, 3 Gvar operational equipment
Stationary simulations
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• Voltages within the transmission grid depend on line utilization
• Severe voltage drops within scenario 2020
• Grid calculation with optimized operation of HVDC lines
• Voltage increase by decraesing the load within the AC-grid
Realer Lastfall 2011 Szenario 2020Szenario 2020 mit HGÜScenario 2020 with HVDC
Vol
tage
in k
V
Line
Util
izat
ion
in %
Scenario 2040
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4
Overview
European power system
VGB research project
Stationary aspects
Dynamic aspects
Outlook
Conclusions
5
Dynamic simulations
Excitation of the system by a major power imbalance
Simulation of the transient grid dynamics
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Comparison of transient frequency behavior –scenario 1
Scenario 1.a Scenario 1.b
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Transient frequency behavior – scenario 1excitation within Germany
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Transient voltage behavior – Scenario 1excitation of 500 Mvar
Significant impact of increasing intermittent generation on transient voltage behavior
Scenario 1.a
Scenario 1.b
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Inertial response in future
Increasing frequency drop with decreasing inertia
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Conclusions
Stationary aspects Transmission limits violated on a few lines Severe voltage drops in different regions due to increasing power flows Additional measures necessary, especially for voltage control HVDC lines contribute to system stability
Transient system dynamics Transient frequency behavior shows no significant changes concerning the
whole system by 2020 (joint-action) Local frequency deviations are increasing Significant impact on transient voltage behavior can be seen Possible impact on synchronous generators of power plants
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Overview
European power system
VGB research project
Stationary aspects
Dynamic aspects
Outlook
Conclusions
Bottleneck of DPGS-integration
110 kV
20 kV400 V20 kV
Voltage
Allowed voltage range
Peak load, w/o DPGS
Legend
DPGS: Decentralised power generation systems
nom 10%U
transU
nom 10%U
loadU
reserveUload flow
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Distance to feed-in point
transU
nom 10%U
load genU Uload flow
Bottleneck of DPGS-integration
110 kV
20 kV400 V20 kV
Voltage
Allowed voltage range
Off-peak load, with DPGS
Distance to feed-in point
10%nomU
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Legend
Bottleneck of DPGS-integration
genloadU U
loadU
~ ~
110 kV
20 kV400 V20 kV
Spannung
nom 10%U
transU
10%nomU
Allowed voltage range
Peak load, w/o DPGS
Off-peak load, with DPGS
Legend
load flow
load flow
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Distance to feed-in point
Dipl.-Ing. Florian GutekunstPhone: +49 711 / 685 65580
University of StuttgartInstitute of Combustion and Power Plant TechnologyDepartment Power Generation and Automatic ControlPfaffenwaldring 23 70569 StuttgartGermany
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