Modle de prsentation EDF Gris

1
An Innovative Methodology to Increase PWR Power
Output by the Temporary Use of Energy Reserve
from the Feedwater Tank in the Secondary
System P.A.R.I. Yves DENAYROLLES Renaud
CRINON Alexandre GIRARD (EDF RD Division)
2
French Power-Frequency Control

• Reminder of Grid energy balance
• electric energy gt hard to store ? permanent
  balance demand-load
• Demand consumption of industries and households
• Load or Production plant fleet supply
• Balance Frequency Grid Control
• f0 50 Hz (or 60 Hz in the US and some areas in
  Japan)
• f lt f0 Power control open HP steam intake
  valves and increase We
• f gt f0 Power control close HP steam intake
  valves and decrease We
• Proportional Control kDf - Priority to
  turbine, Reactor follower
• Plants under power-frequency control operation
• Fossil fuel plants (high fuel costs)
• Hydro plants (limited capacities but fast)
•  Spinning  PWR (about 1/3 n France) ? power set
  point tuned below NP
• Reserve NP Set Point P0

3
Power-Frequency Control UCTE f behavior
Frequency on 2001 42nd week - full week and first
day (hours)
4
Ancillary Services due by producers to the Grid
Manager
Three types of power-frequency reserve

• Depending on the allocated time to re-balance
  demand-load on the grid
• Primary reserveefficient within less than 30s,
  fast automatic controlkDf Proportional part of
  the control 1 NP / -20 mHz typical French
  NPP maximum primary reserve 2 NP
• Secondary reservewithin a few minutes, fix back
  frequency to f0 (50 Hz)N signal -1 1 from
  Electric Independent System Operator (ISO)Pr
  Participation to the secondary reserve (tuned by
  operator) N.Pr Integrator part of the automatic
  controlsystem
• typical French NPP maximum secondary reserve is
  5 NP
• Tertiary reservemargin (capacity - base load
  demand, including maximum primary and secondary
  reserves)Manually controlled by plant operator
  following a load schedule given Dday-1by ISO gt
  Operator tunes power set point P0 as requested
• Load Demand P0 N.Pr kDf

5
Feedwater Tank Energy Reserve Origin
450 m3, 180C 20 bar ? HFWT
250 m3, 20C 1 bar ? HC
Energy Reserve DV(HFWT HC) ? 30 000 MJ
59 EDF NPP fleet 34 PWR with big enough
Feedwater Tank gt 10 x 900 MWe 20 x 1300 MWe
4 x 1500 MWe
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Feedwater Tank Energy Reserve Delivering
Overpower
5 We ?
4 Qturbined LP ?
3 QLP Bleedings ?
6 NCEX ?
2 PLP Heaters ?
6 NADG ?
1 QCEX ?

• Temporary Electric OverPower
• (Time-limited by Condenser High Level)
• 20 mn if 1 NP delivered continuously
• Or any other combination of time x Overpower

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Feedwater Tank Energy Reserve Rebuilding the
reserve
5 We ?
4 Qturbined LP ?
3 QLP Bleedings ?
6 NCEX ?
2 PLP Heaters ?
6 NADG ?
1 QCEX ?
Feedwater Tank Level Remaining Energy
8
Overpower for PWR under base load operation (NP)
Principle Scheme
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Principle of the new  PARI  Control System

• New Electric Load Power Controller
• Actuator Condensate EXtraction system valves
• Activation Load Demand gt NP
• Closed-loop PI and Open Loop Control under
  evaluation
• 3 functionalities fulfilled
• Temporary overpower for PWR under base load
  operation (NP)20mn with 1 NP (or 40mn with
  0.5 NP, or rule)
• Power Output Set Point increased  permanently 
  for PWR under frequency control operation (0.5
  1 NP) gt Most valuable solution
• Increased Primary Reserve or Grid Emergency
  Reserve by 1 NP

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Power Output Set Point increased  permanently 
for PWR
under frequency control operation Principle
Scheme
11
Power Output Set Point increased  permanently 
for PWR
under frequency control operation Simulation
Results
First 12h 2001 w42 OnlyPrimary Reserve
Delivery kDf
12
Power Output Set Point increased  permanently 
for PWR
under frequency control operation Simulation
Results
First 12h 2001 w42 Primary Reserve Secondary
Reserve Delivery kDf N.Pr
13
Tuning Overpower a with Statistical f grid
analysis
kDf N.Pr
kDf
Worst week / 31 (2005-2006)
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Conclusion

• P.A.R.I. Methodology allows
• Temporary overpower for PWR under base load
  operation (NP)20mn with 1 NP (or 40mn with
  0.5 NP, or rule)
• Power Output Set Point increased  permanently 
  for PWR under frequency control operation (0.5
  1 NP) gt Most valuable solution
• Increased Primary Reserve or Grid Emergency
  Reserve of 1 NP
• Decision of experimentation on a french 1300 Mwe
  NPP is discussed
• Foreign interested partners are welcome to
  contact EDF RD Division
• Information about Power-Frequency control outside
  Europe ?(s, Primary Reserve, 0.4 margin to
  avoid Pth exceeding, )