1. Paris distribution system
Principles
Performance
Future

2. Radial (225 kV) –Concentric (20 kV) structure
kV substation
225 kV cable (1 or 2)
20 kV 6* (cable x 4)
kV substation
1x70 MVA or 2*70 MVA
Or 1x100 MVA

3. Forces and weaknesses High energy density
225 kV feeders
Load dispatch between feeders
Quick service restoration in case of failure
SAIDI 8 min, SAIFI 0.97 outages/year
Scheduled load redispatch for planned works
Important length of MV feeders
Some with aging technologies/sensitive accessories
Complex exploitation
Protection scheme and automation

4. Expectation Slow but steady growth High Quality of service expected
From 2.75 GW (2008) up to 3.25 GW (2030)
3.75 GW if strong development of EV
High Quality of service expected
Target : SAIDI <5 min SAIFI < 0.5 outage/year
Preserve/enhance « operationnal flexibility »
Prevent reliability drift due to aging MV cables
Reduce total length
Remove/replace sensitive assets
Reduce necessity of large transformers
100 MW needs self for default current elimination
Minimize costs

5. An evolutionnary structure
Optimized existing feeders
New feeders
Optimized transfo size

6. Results expected Optimize length Possibility to avoid large transfo
Build MV connection between circular feeders km
Reduce length of circular feeders
MV length down from km to km
Possibility to avoid large transfo
Only on low load scenario
Quality target
Reduced costs compare to same structure