GREDOR Gestion des Réseaux Electriques de
Distribution Ouverts aux Renouvelables !
Task 3 - Operational Planning
General meeting Q. Gemine - ULg
January 27, 2014
!1
GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
Operational planning
!2
Goal ?
Anticipate and prevent, in the short term, insecure operation situations.
GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
Operational planning
!2
When ?
Before real time operation.
Goal ?
Anticipate and prevent, in the short term, insecure operation situations.
GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
Operational planning
!2
When ?
Before real time operation.
How ?
Using a set of actions provided to the Distribution System Operator.
Goal ?
Anticipate and prevent, in the short term, insecure operation situations.
GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
Insecure operation situations
An electrical state is insecure if the operational limits of a network component are violated.
!3
Voltage limits at buses:
Bus i Vi ≤ Vi ≤ V̅i
e.g. : 0.95 p.u. ≤ Vi ≤ 1.05 p.u.!with 1 p.u. = 15 kV
Current limit within links:
Bus i Bus j
|Iij| ≤ I ̅ij
GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
Decision framework
What does "before real time operation" means?
!4
Intraday
15 min 15 min 15 min … 15 min
Day-aheadDA
closure
……
Time
Potential decision stages
GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
Decision frameworkTo prevent insecure situations, the future state of the grid needs to be anticipated. Because some phenomena are uncertain, more than one future might be credible.
!5
Time
?
GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
Decision frameworkTo prevent insecure situations, the future state of the grid needs to be anticipated. Because some phenomena are uncertain, more than one future might be credible.
!5
Time
?100%
50%
0%
Each realization of the uncertain phenomena corresponds to a scenario.
Scenario 1
Scenario 2
Scenario 3
GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
Decision frameworkTo prevent insecure situations, the future state of the grid needs to be anticipated. Because some phenomena are uncertain, more than one future might be credible.
!5
Time
?100%
50%
0%
Each realization of the uncertain phenomena corresponds to a scenario.
Scenario 1
Scenario 2
Scenario 3
GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
Scenario trees
!6
At each decision stage, there is some uncertainty for the periods to come.
Time
Each path in the tree is a scenario.
GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
Actions
!7
The actions considered for operational planning can be classified into two categories:
A. network reconfiguration (transparent to users)
‣ transformer ratios
‣ compensators
‣ topological changes
B. modulation of power injections (affect users)
‣ production curtailment
‣ load modulation (demand side management)
GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
Illustrative Example
!8
Time
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GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
Illustrative Example
!8
Time
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P
P
P
GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
Illustrative Example
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GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
Illustrative Example
!8
Time
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€
GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
Illustrative Example
!8
Time
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GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
Illustrative Example
!8
Time
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P
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Solution A:€
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GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
Illustrative Example
!8
Time
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Solution A:€
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Alternative?
GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
Illustrative Example
!8
Time
100%
50%
0%
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Solution A:€
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?
GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
Illustrative Example
!8
Time
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50%
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P
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Solution A:€
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V €
GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
Illustrative Example
!8
Time
100%
50%
0%
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P
€
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Solution A:€
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GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
Illustrative Example
!8
Time
100%
50%
0%
€
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Solution A:€
+€€€
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{V €
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GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
Illustrative Example
!8
Time
100%
50%
0%
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Solution A:€
+€€€
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{V €
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GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
Illustrative Example
!8
Time
100%
50%
0%
Solution A:€
+€€€
€€€€
{V €
P
P
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GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
Illustrative Example
!8
Time
100%
50%
0%
Solution A:€
+€€€
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P
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+Solution B: €€
GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
Optimization problem
!9
min expected cost of operation
s.t. no insure operation situation
among scenarios
GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
Optimization problem
!9
min expected cost of operation
s.t. no insure operation situation
among scenarios
Objective
GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
Optimization problem
!9
min expected cost of operation
s.t. no insure operation situation
among scenarios
Objective
{ Constraints
GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
Optimization problem
!9
min expected cost of operation
s.t. no insure operation situation
among scenarios
Objective
{ Constraints
GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
Optimization problem
!9
min expected cost of operation
s.t. no insure operation situation
among scenarios
Objective
{ Constraints
GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
Optimization problem
!9
min expected cost of operation
s.t. no insure operation situation
among scenarios
Objective
{ Constraints
GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
Optimization problem
!10
Because of the power flow equations and of the time-coupling nature of the problem, it is very complex to solve and it cannot be addressed by out-of-the-box software solutions.
GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
Optimization problem
!10
Because of the power flow equations and of the time-coupling nature of the problem, it is very complex to solve and it cannot be addressed by out-of-the-box software solutions.
GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
Optimization problem
!10
Because of the power flow equations and of the time-coupling nature of the problem, it is very complex to solve and it cannot be addressed by out-of-the-box software solutions.
GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
Optimization problem
!10
Because of the power flow equations and of the time-coupling nature of the problem, it is very complex to solve and it cannot be addressed by out-of-the-box software solutions.
GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
Optimization problem
!10
Because of the power flow equations and of the time-coupling nature of the problem, it is very complex to solve and it cannot be addressed by out-of-the-box software solutions.
?
GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
Optimization problem
!11
Because of the complexity, we must use simplified versions of the original problem, called relaxations.
GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
Optimization problem
!11
Because of the complexity, we must use simplified versions of the original problem, called relaxations.
These last months, we focused on designing a relaxation that would feature both:
• a good approximation of the original problem
• an acceptable computationally complexity
GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
Current state of the art GREDOR prototype
Approximation quality
Computational complexity
Current progress
!12
GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
Current state of the art GREDOR prototype
Approximation quality
Computational complexity
Current progress
!12
GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
Current state of the art GREDOR prototype
Approximation quality
Computational complexity
Current progress
!12
GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
Computational complexity
!13
Tim
e (s
)
1
100
10000
6 buses 9 buses 14 buses
1.207
11182254,7
40,738,7
Standard benchmark
GREDORbenchmark
Results for standard test networks with 8 periods and 9 decision stages.
GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
Future work
!14
We are going focus on three main research axis:
•improve the design of the relaxation the solve the problem of operational planning both faster and more accurately
•simulate the operational planning tool on some test networks of RESA and ORES
•provide a quantification mean to evaluate the interaction mechanisms designed in task 1