Callia - a design for a digitized flexibility trading ...€¦ · Bert Claessens, Rainer Enzenh...

Callia - a design for a digitized flexibility tradingplatform and its operative and economic benefits for

DSOs and TSOs

Bert Claessens, Rainer Enzenhofer, Josef Haunschmied

[email protected]

IEWT 2019, February 14, 2019

Bert Claessens, Rainer Enzenhofer, Josef Haunschmied (TU Wien - SWM ORCOS)Callia - a design for a digitized flexibility trading platform and its operative and economic benefits for DSOs and TSOsIEWT 2019, February 14, 2019 1 / 16

Expansion of RES

Impact on all voltage levels

Higher volatility in generation

Markets to acquire flexibility are needed

Grid topologies have to be integrated

Digitization for smart grids

Integration of small and medium scale flexibility units

Handling complexity

Local/regional offers - but system wide competition


Flexiblity Trading - Use Cases

Use Case I: Energy Neutral Flexibility Trading

Use Case II: Congestion Management

Use Case III: Voltage Control

Use Case IV: Loss Mitigation

System Approach


System

Transmission Grid

k(1)

k(2)

k(3)

k(4)Slack Node 1

power plants

Region 1

Slack Node 2power plants

Region 2

Slack Node 3

power plants

Region 3

Slack Node 4

Feeder 4a Feeder 4b

power plants

Region 4

1


Flexibility Offer Types

Tank Offers

Batteries, Market Aggregator, office building/air-condition


Receding Horizon - Model Predictive Control


TSO

DSO1

. . .

flex offers

. . .

flex offers

DSO2

. . .flex offers

. . .

. . .

. . .flex offers

... flex offers...flex offers

. . . . . .

flex offers

DSO3

DSO32DSO31

1


region at time 1

region at time 2

...

region at time 32

decompose

flex unitregion

region at time 1

region at time 2

region at time 32

p1q1

p1q1

p32q32


Duplicated variables for decomposition

α+i (t) . . . decomposition variables of α+

i (t) charging

α−i (t) . . . decomposition variables of α−i (t) discharging

Si (t) . . . decomposition variables of Si (t) SoC

Obviously, in the final feasible solution, decomposed variables have to beequal:

Si (t) = Si (t), i ∈ B decomposition

α+i (t) = α+

i (t), i ∈ B decomposition

α−i (t) = α−i (t), i ∈ B decomposition

Note: Variables Pi (t) at slack node i need not be duplicated as thevariables Pk(i) takes over the role of duplicated variables.However, we have to consider a small adaption, as the flowdirection changes (i.e. we have to change signs):

Pi (t) = −Pk(i)(t), slack node i decomposition

Bert Claessens, Rainer Enzenhofer, Josef Haunschmied (TU Wien - SWM ORCOS)Callia - a design for a digitized flexibility trading platform and its operative and economic benefits for DSOs and TSOsIEWT 2019, February 14, 2019 10 /

16

Lagrangian Function

Variables q are the duplications of the variables p.

minx ,p,q∑t

C t(x t , qt)

s.t. (x t , pt) ∈ S t

q ∈ D

pt = qt

For each component of p − q, we define a shadow price and define a setµ = (µ1, ..., µt) of dual variables (vectors)

L(x , p, q, µ) =∑t

C t(x t , qt) +∑t

µt · (pt − qt)

Dual function θ : θ(µ) := min(x ,p)∈S,q∈D L(x , p, q, µ),Dual problem maxµ θ(µ).


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Market algorithm - our findings

Bundle Method

Linear approximation of dual functionSynchronization - Use Case 1Had to limit shadow prices

Bundle Method with step-size control

Quadratic penalty on step-size, Armijo like parameters etcUse Case 2 extreme case: unfeasible - unboundedExit scenario - capped shadow prices

Adding 1 step Newton-Rhapson for linearization

Use Case 3 and Use Case 4Still no satisfactory performance

ADMM (Alternating Direction Method of Multipliers)


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local markets integrated

respect privacy parallelize-able


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ERA-Net SmartGrid+ Project Callia

Finally, my thanks to the Callia project partners

DSO: Stadtwerke Heidelberg, Bedas Istanbul

TSO: Transnet BW, Bedas Istanbul

Grid communication: Salzburg Research, REstore Antwerp, VITO Genk

RES: ISC Konstanz (PV)

Flex: REstore Antwerp (aggregator), Blue.sky (batteries), Bedas

Scientific: Salzburg Research, Univ. Stuttgart, TU Wien, VITO Genk

Power Electronics: Devolo, Pavotek


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”Freedom, equality, democracy: blessings or chaos for energy markets? ”

The Energiewende might cause chaos, freedom, equality and democracy isthe chance to get the chaos under control. A system-wide grid-basedwelfare optimizing flexibility market might help to take this opportunity.

Thank you for your attention


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Task 1.1 – Challenges, opportunities and requirements for open inter-DSO Electricity Markets

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18 19 20

21

22

23

23 Nodes Generic Grid Model

3

Biogas/Others

PV

Feeder 2 12 Nodes (20 kV)

Feeder 1 10 Nodes (20 kV)

1

0,26Km

0,66Km

2,40Km

1,90Km

1,00Km 1,20Km

0,70Km

1,20Km

0,80Km

2,00Km

1,40Km

0,35Km

0,17Km

0,15Km

4,4Km

0,14Km

1,00Km 0,25Km

0,70Km 2,15Km

0,70Km

0,50Km

Slack Node

R’ = 0,168 Ω/Km (For All Lines) r’ = 0,042 p.u/Km (20kV/100MVA Base) Max Load per Line: 8 MW

All Nodes have a load connected (Except Slack Node)

Node Load [KW] Gen [kW]

1 0 0

2 28 782

3 28 740

4 462 103

5 145 0

6 338 0

7 261 0

8 80 113

9 4084 19

10 124 0

11 49 524

12 110 0

13 122 0

14 26 0

15 173 0

16 26 44

17 212 42

18 264 223

19 527 0

20 258 0

21 423 0

22 595 0

23 347 0

Sum 8683 2591



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Callia - a design for a digitized flexibility trading ...€¦ · Bert Claessens, Rainer Enzenh...

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