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2015-12-14 – Stockholm
Joint NordREG / Nordic TSO workshop on Flow-Based capacity calculation
Convener CWE FB Experts:
Christophe Mestdag – christophe.mestdag@elia.be
CWE Flow Based Market Coupling
TSO point of view
1
2
Overview
o Context
o Creation of the CWE FB domain
o IT implementation
o Transparency and interaction with market players
oObservations / Future improvements / Q&A
3
Overview
o Context
o Creation of the CWE FB domain
o IT implementation
o Transparency and interaction with market players
oObservations / Future improvements / Q&A
4
CWE Market Coupling
06/06/2007: CWE Memorandum of Understanding (PLEF):
Increase SoS
Implement FB MC
5
CWE FB MC - milestones
19/03/2012: « Internal Parallel Run »: daily process progressively done by TSO operators
21/02/2013: “External Parallel Run”: weekly publication of simulated market results
20/02/2014: “Daily External Parallel Run”: daily publication of simulated results
23/04/2015: Last approval decisions from CWE NRAs
20/05/2015 (trading day): successful launch of the CWE Flow-Based capacity calculation and allocation
Under the FB methodology both welfare and price convergence increase
Based on 2,5 years of // run, a yearly welfare increase of market welfare of more than 100 M€/year can be expected ≈ 300 k€ / day
6
ATC and Flow Based approaches
Capacity by Border
Economical flow
Physical
flows
Margin by Electrical branch
TTC
LTnom
TRM
Available transfer capacity
Ʃ Fmax
N-1 + baseflow
Fref (including Ltnom and N-1)
FRM
Margin available to the market
Fmax
Involved parties
7
8
Overview
o Context
o Creation of the CWE FB domain
o IT implementation
o Transparancy and interaction with market players
oObservations / Future improvements / Q&A
9
Input for the model
Basecase
GSK
D2CF CWE
DACF entso-e
CB
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D2CF
How will the grid be ?
Production
Renewable energy
Grid Topology
Load
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Generation Shift Key
Need to translate an incremental cross-border exchange into incremental nodal injections
+100 MW -100 MW
~
~
~ ~
~
~
~
~
~
5 MW
30 MW
20 MW
10 MW
15 MW
20 MW
~
~
~
TSO C
TSO A TSO B
Based on common principles, each TSO
determines the key which maps an import /
export position to an generation pattern
12
Impact of N-1
Country A
Country C
Country B
+100 MW
-100 MW
Monitored
lines
Outage
scenario
Margin left
(MW)
Influence of exchange
on lines (PTDF)
AB AC BC
Line 1 No
outage
…
…
Line 2 …
…
Line 3 …
…
150 10%
line 1
Outage1
120 Outage 1 20%
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Creation of the FB domain SoS safe
Monitored Lines Outage scenario Margin left (MW)
Influence of exchange on lines (PTDF)
AB AC BC
Line 1 No outage 150 1% 10% 3%
Outage 1 120 5% 20% 1%
Outage 2 100 6% 25% 1%
Line 2 No outage 150 -2% 0 5%
Outage 3 100 -12% 0 10%
Line 3 No outage
Outage 4
- 400
- 300
- 200
- 100
0
100
200
300
400
- 400 - 300 - 200 100 200 300 400 - 100 0
Security of supply domain
Constraints
Exchange(A>C)
Exchange(A>B)
Active Constraints
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Congestion Management Principles
• Security domain is obtained by taking into account all the relevant physical constraints of the grid
• Given the security domain, NTC/ATC constraints and the corresponding NTC/ATC domain are a choice made by the TSO
• The FB domain is the security domain
itself
• FB offers more trading opportunities with the same level of security of supply
• In FB capacity split is not a choice
of the TSO, but is market driven
(at the time of allocation)
Daily process
15
Data Preparation: D2CF, CB + initial Remedial Actions, GSK,…
20:00 09:30 16:00
Qualification: mandatory checks: LTA, NTC,… + additional RA
FB domain calculation
20:30
Verification: local facultative checks: Voltage or Stability problems
Long Term Adjustement
Congestion Income Allocation: by Jao
Allocation in Euphemia (PCR) = “hybrid coupling” :
ATC and FB contraints together
12:00 13:00 04:00 08:00
Day -1 Day -2
Qualification: focus on PST coordination
16
PST’s
in CWE Region
Impact of PSTs
17
Pedagogical example: asymmetrical usage in CWE
Region
Impact of PSTs
18
Pedagogical example: symmetrical usage in CWE
Region
PST coordination proces
19
o Common determination of most likely market direction
o Gathering of constraints in the grid from TSO to RSCI
o Assessing most optimal setpoint of all CWE PSTs in multiple iterations
20
Overview
o Context
o Creation of the CWE FB domain
o IT implementation
o Transparency and interaction with market players
oObservations / Future improvements / Q&A
IT solutions – message flows
21
IT solutions – software design
22
FBPCM
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Overview
o Context
o Creation of the CWE FB domain
o IT implementation
o Transparency and interaction with market players
oObservations / Future improvements / Q&A
24
Transparancy and interaction with market players
Multiple channels have been set up:
o Q&A Forum
o Utility Tool (excel & web services)
o Anonymised information with fixed ID about critical branches (RAM + PTDF)
o Aggregated D2CF data
o Indicators of Flow Based domain
o Market data
o User groups CCG
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Overview
o Context
o Creation of the CWE FB domain
o IT implementation
o Transparency and interaction with market players
oObservations / Future improvements / Q&A
Observations since go-live
As foreseen, the price convergence in CWE has significantly increased since the go-
live.
As foreseen, physical flows induced by market exchanges are better forecasted with
Flow-Based Market Coupling, which increases grid security.
But on the other hands, net positions are different that what was observed with ATC
MC:
NL imports more;
DE exports more;
FR can export more;
BE can import more.
With Flow-Based, physical flows are more variable/volatile and are regularly loading the
grid elements closer to their limits. (This may also limit the capacity available for ID
exchanges).
26
Points for the future
Different elements remain for continuous improvements:
o Advanced Hybrid Coupling
o Collaboration CWE – CEE
o Further improvements on coordination
o Basecase improvements and GSK modelling
o Transparancy and interaction with market players
o …
27
Questions ?
Q&A 28
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