Flexibility options – a distribution system operator perspective Berlin, 24 September 2015 Dr. Sascha Schröder

EWE NETZ: Caring for reliable and modern distribution grids

Strom / Gas

Telekommunikation

2

Brandenburg • 175,000 km network

length (power + gas + telecommunications)

• >800,000 power customers, >700,000 gas customers

• Power: interruptions last only 3 min/year

2014: 75% of distributed power generated by renewable generation within the region

3

TWh

EWE NETZ | Dr. Sascha Schröder | Flexibility options – a DSO perspective | Berlin, 24 September 2015

2009 2010 2011 2012 2013 2014

RE share: approx. 75%

Elec

tric

ity d

istr

ibut

ed b

y EW

E N

ETZ

RE

gene

ratio

n

9.6

12.9

Flexibility options

Demand-side management Battery storage systems (different demonstration projects) Controllable substations (installing 260 until 2016) Curtailment of renewable generation …

4 EWE NETZ | Dr. Sascha Schröder | Flexibility options – a DSO perspective | Berlin, 24 September 2015

How would you dimension network capacity?

Offshore connection, Germany: Interconnector capacity = 100% of installed wind capacity TSO ordering the interconnector Offshore connection, United Kingdom (former regime): Interconnector capacity = 90% of installed wind capacity Wind farm ordering the interconnector

5 EWE NETZ | Dr. Sascha Schröder | Flexibility options – a DSO perspective | Berlin, 24 September 2015

Generation curtailment and network feed-in capacity

6

0 2 4 6 8 10 12 14 16 100

150

200

250

300

350

Curtailed energy [%]

Net

wor

k fe

ed-in

cap

acity

[%]

Curtailing 5% of annual generation allows doubling the feed-in capacity of the distribution grid!

EWE NETZ | Dr. Sascha Schröder | Flexibility options – a DSO perspective | Berlin, 24 September 2015

Examples: Curtailment of single generation units

7

!

Wind farm connected to a 20kV transformer

PV connected to the low voltage grid

Efficiency driver: Moderate curtailment according to prevailing network status

EWE NETZ | Dr. Sascha Schröder | Flexibility options – a DSO perspective | Berlin, 24 September 2015

Dynamic vs. static curtailment

8

Removed strain

Removed strain

Dynamic curtailment has a far more beneficial effect for the network

EWE NETZ | Dr. Sascha Schröder | Flexibility options – a DSO perspective | Berlin, 24 September 2015

9

11 decentral generation units, combination of wind / PV / biogas

5% demonstration site

EWE NETZ | Dr. Sascha Schröder | Flexibility options – a DSO perspective | Berlin, 24 September 2015

enera demonstration project (application)

Covering 4 counties: 2.665 km2

390.000 inhabitants 200.000 households

1,75 GW installed RE capacity 1,50 GW installed wind capacity 170% RE generation/consumption 200 Mill. Euro Inter alia: 40.000 smart meters

EWE NETZ | Dr. Sascha Schröder | Flexibility options – a DSO perspective | Berlin, 24 September 2015 10

Conclusions

Short-term: 5% dynamic curtailment allows massive RE investment without raising network charges!

Dynamic curtailment in general superior to static curtailment Technical feasibility of 5% dynamic curtailment has been proven in

small demonstration project Next step: large-scale wind integration demonstration project enera

Complements to curtailment: controllable substations, battery

storage systems, …

11 EWE NETZ | Dr. Sascha Schröder | Flexibility options – a DSO perspective | Berlin, 24 September 2015

Thank you for your attention! Dr. Sascha Schröder EWE NETZ GmbH Cloppenburger Str. 302 26133 Oldenburg sascha.schroeder[at]ewe-netz.de www.ewe-netz.de