Transcript INTEGRATION OF THE AEGEAN OFF

INTEGRATION OF OFFSHORE
WIND FARMS TO THE GREEK
TRANSMISSION SYSTEM VIA AN
ISLAND INTERCONNECTION GRID
A. Koronides
J. Kabouris
M. Efstathiou
M. Tsili
Hellenic TSO
M. Papadopoulos Em. Prof. of NTUA
President of the Hellenic TSO
INTRODUCTION (1)
• Existing submarine cable interconnections:
- AC 150kV: All Ionian islands (1964 – 76)
- AC 15 – 20kV: About 65 islands (since 1960)
- DC 500kV: Greece – Italy (2002)
• Under construction: Cycladic Interconnection
• Planned island interconnection of all the
Aegean islands, in order to:
(a) Eliminate the existing oil powered stations
(b) Exploit the excellent wind potential
DEVELOPMENT STAGES
• Three main stages:
(A) Preliminary planning of the “Aegean sea grid”, based on
existing projections (island loads and proposals for RES
installations)
(B) Detailed design of the interconnection of each group of
islands, to accommodate the RES plants with installation
licenses
(C) Construction of each interconnection, when the proper
conditions (economic feasibility, technical maturity etc) are
obtained.
ISLAND GROUPS
and expected wind power
• Four main interconnections – island groups
and expected wind capacity (on the islands):
(1) Cycladic islands (construction stage)
Production licenses: 650MW
(2) North Aegean islands
Production licenses: 700MW
(3) Crete
Production licenses: 2.200MW
(4) Dodecanese
Expected wind power on the islands: 700MW
• Stand-alone interconnection – Skyros
with expected wind power 333MW
Applications for offshore wind farms
GRID INTERCONNECTION
• EHV Substations (400/150 kV) have been chosen
as connection points to the mainland grid
– Robust system nodes (high short-circuit power)
– Enough transmission capacity to absorb large wind
power capacity
• Limitations to the absorbed wind power
– Transmission system reinforcements for the
accommodation of wind power
– Restrictions in the total installed wind capacity due to
the transfer capacity limits between North and South
Greece
WIND POWER PENETRATION LIMITS
• of EHV Substations (400/150kV) of the mainland grid
AEGEAN ISLANDS PROPOSED
INTERCONNECTION SCHEME
AEGEAN ISLANDS PROPOSED
INTERCONNECTION SCHEMES
• Accommodation of onshore wind farms (4583MW)
Island Group
Expected Wind Farms
Installed Capacity
(MW)
Connection Point
(EHV Substation)
Cyclades
650
Pallini/Lavrio
North Aegean
700
Larymna/Filippoi
Crete
2200
Megalopoli/Aharnes
Dodecanese
700
Aharnes
Skyros
333
Larymna
AEGEAN ISLANDS PROPOSED
INTERCONNECTION SCHEMES
• Accommodation of offshore wind farms
Island Group
Expected Wind
Farms
Installed
Capacity (MW)
Connection Point
(EHV Substation)
Fanari-Thasos
500
Filippoi
Alexandroupoli –
Samothraki – LimnosAgios Efstratios
1000
To be further investigated in
conjunction with possible onshore
wind farm developments in Thrace
Karpathos
70
Dodecanese
Kymi
75
Aliveri
Petalioi
180
possibility of connection to Aharnes or
Pallini must be investigated
Kerkyra-Lefkada
160
Ahelwos/Arahthos
Grid Interconnection Issues
•
Connection of the offshore parks in islands Alexandroupoli – Samothraki –
Limnos- Agios Efstratios must be further investigated – reduction of the
installed capacity of onshore parks in the North Aegean islands or Thrace
•
The possibility to accommodate the above offshore wind farms by
connection to EHV substations (400/150 kV) of the South system is
limited due to the overall onshore installed capacities in
Cyclades/Dodecanese
•
The offshore wind farms in Karpathos can be accommodated by the
interconnection of Dodecanese islands to the mainland grid
•
The connection of offshore wind farms in Petalioi must be investigated
due to the overall onshore installed capacities in Cyclades/Dodecanese that
are connected to 400/150 kV of the South system (Aharnes/Pallini)
•
No special considerations for the connection of offshore wind farms in the
rest of the considered islands
Conclusions
• There are possibilities of integration of offshore wind
farms to the greek transmission system via an island
interconnection grid in order to support Maritime Spatial
Planning
• The potential from offshore parks that can be
accommodated by the existing or planned submarine
cable interconnections is highly dependent on the
onshore wind farm developments (mainland/islands)
• Limitations to the absorbed wind power in the mainland
grid imposed by the transmission system infrastructure
should be considered