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TERNA CRNA GORA
HVDC MON.ITA Project
Rome , 27 th January 2014
MON.ITA Project
In Montenegro, connection point will be the new 400/110 kV substation in Lastva
The new planned 400 kV Lastva substation will be built as “in-out” substation, by cutting the
existing 400 kV line Trebinje-Podgorica 2 and realizing a new 400 kV connection
The new planned 400 kV Lastva-Plevlija 2 overhead line will be realized
HVDC link and associated grid infrastructures
2
Stazione 1
Scheme of the link
MON.ITA Project
Nominal voltage: VDC = 500 kV
Nominal power: PDC = 1000 MW
Configuration: bipolar with marine electrodes
Conversion technology: LCC (line-commuted converter)
Power flow: Bidirectional
Cable type: MI (mass impregnated)
3
Layout of project infrastructures in Italy and Montenegro
MON.ITA Project
Part in DC cableItalian side ~16 km
Existing
substation
Pljevlja 2
In-out 400 kV from SE
Lastva in existing
Podgorica II - Trebinje~35 km
Lastva Grbaljska
Mrcevo Polije
Terrestrial cables
Cepagatti
converter
station
New Overhead line
400kV
Lastva - Pljevlja II
~160 km
Marine
connection~393 km
Marine cables
4
AC Filters Storage
Controlbuilding
Valves hall DC Building
MON.ITA project
General layout of converter station
5
Terrestrial cable route
MON.ITA project
Proposal of TERNA – out of DSP corridor
1°solution – inside DSP corridor
2°solution* – inside DSP corridor
Final solution* – inside DSP corridor
FINAL ROUTE
6
UNDERGROUND CABLE (Cu 1x1900 mm2)cable diameter ̴12 cm
No. Constituents
1 Conductor , round centre wire and concentric layers of “key-stone”
2 Conductor screen, carbon black paper
3Insulation, water washed wood pulp HVDC cable paper impregnated
compund
4 Insulation screen, carbon black paper and metallized paper
5 Lead sheath, alloy
6 Inner sheath, polyethylene
7 Transversal reinforcement
8 Longitudinal reinforcement
9 Outer sheath, polyethylene
Power cable section
MON.ITA project
7
Marine cable route and profile
Bathymetric profile
MON.ITA project
Tracciato.wmv
8
OPTICAL CABLEcable diameter ̴4 cm
MV CABLE (Cu 630 mm2)cable diameter ̴8 cm
HVDC CABLE (Al 1900 mm2)CABLE DIAMETER ̴14 cm
No. Constituents
1 optical fibers
2 core
3 retain
4 protective tapes
5 Copper case
6 Polyethylene case
7 Galvanized steel wires
8 Filling
9 Galvanized steel wires
10 External bandage
Sections of marine cables
MON.ITA project
9
Sea trial
CIGRE Electra n. 171 recommends carrying out this test when
laying conditions and/or cable designs differ considerably from
previously established practice (in order to verify the
performance of cable in conditions of mechanical and
environmental stresses).
The test is carried out on a sample of cable sufficiently long to
reproduce the laying conditions and includes both a factory
joint and a repair joint.
The cable sample is laid at the maximum sea depth the cable
will reach in real laying conditions and then recovered and
subject to electrical tests and visual examination
MON.ITA project
10
SA.CO.I - main tasks and short historyIn December 1967, the Sardinia – Corsica – Italian Mainland direct current interconnection (200kV – 200 MW), called
SACOI, entered into operation, connecting the Codrongianos (Sardinia) converter stations with S.Dalmazio (middle
Tuscany), in order to initially perform large energy transfers from the new Sardinia (Sulcis) coal power plants
towards the Italian Mainland.
This use almost immediately underwent some changes, actually allowing to compensate for production shortages
in the island, both referring to load/production imbalance periods and to particular emergency conditions and to
regulate frequency in AC sardinian grid.
The two converter stations were connected to the 220 kVac grids and
the converter was equipped with two esaphase bridges with mercury arc valves
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