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Feature 2 | ProPulsion & Power generation
Power and propulsion
Sub-Alliance formed for CVF
In October 2008, Thales UK signed an agreement with Rolls-Royce,
Converteam and L-3 Marine Systems UK for the integrated power
and propulsion system for the UK Royal Navy’s two new 65,000tonne
aircraft carriers.
his ‘Sub-Alliance’ to the Aircraft contracted directly for the supply of the vessel’s CVF is in fact the first Royal Navy vessel to
Carrier Alliance (ACA) – which main and emergency diesel generators. be designed from the outset as an IFEP ship,
is charged to deliver the Royal The two new carriers will be the largest and and its power and propulsion system has been
Navy’s Future Carrier (CVF) programme most powerful ships ever built for the Royal engineered so as to balance requirements for
– has been awarded contracts totalling Navy, representing a step change in capability robustness, efficiency, availability, reliability
£235 million (US$361.7 million) by over the Invincible class ships they will and responsiveness.
Thales, a member of the ACA, which has replace. The adoption of an Integrated Full However, while the IFEP architecture
responsibility for leading the power and Electric Propulsion (IFEP) architecture adopted will leverage technology
propulsion elements for the two CVF is one of the principal innovations and machinery already matured
vessels, HMS Queen Elizabeth and HMS incorporated in the CVF design; indeed, by the Type 45 Integrated Electric
Prince of Wales. the two vessels will enter service in 2014 Propulsion programme, the Electric
Rolls-Royce will supply the gas turbines, and 2016 respectively as the world’s largest Ship Technology Demonstrator and
shaftlines, propellers, steering gear, rudders, ever all-electric ships. commercial practice, it is not without
active stabilisers and the low-voltage (LV) A combination of two gas turbine some departures. It features a second
electrical system; Converteam will provide alternators (GTAs) and four diesel generators advanced induction motor on each
the high-voltage (HV) system and propulsion will generate in excess of 108MW at 11kV shaft, a new design GTA and an
converters/motors; and L-3 will supply the to meet the propulsive power demand for a 11,000V electrical power system (more
integrated platform management system speed in excess of 25kts, while at the same than twice that of Type 45 the highest
(IPMS). Wärtsilä had previously been time meeting shipwide LV power needs. ever used on a Royal Navy warship).
The principle advantage of IFEP
over more conventional mechanical
and hybrid mechanical and electrical
propulsion is that all the prime movers
contribute to the power delivered
directly to the propulsion system and so
can be operated at their most efficient
point. In simple terms, the flexibility of
the architecture enables the operator to
opt not to run selected prime movers
while still delivering balanced power
into the shaftlines. This is possible as
all the discrete generator sets feed a
common HV bus (11kV/60Hz), which
then subsequently feeds the propulsion
and ship service/hotel loads.
Power for the latter (comfortably
exceeding 10MW) will be distributed
shipwide at 440V into five independent
zones. Twelve switchboards will
distribute power, with the design
a combination of two gas turbine alternators and four diesel generators will generate in enabling re-routing of power supplies
excess of 108Mw (photo: aircraft Carrier alliance). in the event of failure.
20 Warship Technology January 2009
WT_Jan09_p20+21+24.indd 20 12/23/08 2:23:22 AM
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