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Diesel Electric Propulsion System for P&O Cruise Liner Aurora Diesel Electric Propulsion System
for P&O Cruise Liner Aurora 2
SAM Electronics´ system responsibility for:
Diesel-electric propulsion system, electrical power generation and power distribution system; Integrated navigation system
Electric Propulsion System for P&O "Aurora" -
a Propulsion System with a high Level of Redundancy
Main data:
Length overall approx.
270 m
Breadth
32.20 m
Design draught approx.
7.9 m
Gross measurement est.
76000 t
Passenger cabins
934
Service Speed
24 knots
Power plant
56.0 MW
Propulsion drives
2 x 20 MW
Thruster drives
4 x 1.5 MW
Chiller drives
3 x 1.35 MW
Propulsion and power components supplied by SAM Electronics 2 Diesel-electric main propulsion drives with:
- 2 Double-winding synchronous motors 20 MW, 140 rpm
- 2 Synchro-Converters 12/12-pulse, each with two pure water coolers and two
redundant excitation and control systems in master/slave-configuration
- 8 Cast resin propulsion transformers 8.4 MVA 6 Diesel generators
4 x 17.5 MVA, 6.6 kV, 60 Hz, 514 rpm
2 x 1.25 MVA, 690 V, 60 Hz, 1800 rpm Switchboards 6.6 kV with 11 and 12 panels for medium voltage distribution 4 Harmonic filter banks reducing the total harmonic distortion of the mains voltage to max. 5 % 8 Ring main substation units 4 x 1.5 MVA and 4 x 1.1 MVA incl. medium and low voltage switchboards
and cast resin transformers for low voltage supply 5 Cast resin transformers for engine room and emergency switchboard supply 7 AC motors 4 x 1.5 MW, 6.6 kV, 1200 rpm for thrusters and 3 x 1.35 MW, 6.6 kV, 3600 rpm
for air-condition compressors 3
General
For the new flagship of P&O, built at
Meyer Shipyard, SAM Electronics was
selected as main contractor for the
complete electric power generation,
main power distribution and the electric
propulsion system. Based on the
existing experience acquired from the
delivery of more than 140 electrical
propulsion drives, SAM Electronics has
taken over also the system responsibility
for the power generation in combina-
tion with the propulsion system.
Mathematical models as well as own
software simulation programs allow
precise predictions concerning the
behaviour and the quality of the power
network. The "Aurora" is designed as a
passenger vessel with a very high
standard for all accommodation areas.
This high standard is consequently
achieved also for the machinery,
especially for the propulsion system.
Intensive safety requirements of P&O
lead to a design with a high level of
redundancy. This guarantees a high
availability under all sailing conditions.
System Description
The "Aurora" is equipped with four
diesel generators providing all electric
energy for the propulsion, all machinery
and hotel consumers. The medium
voltage switchboard is split into two
sections, which feed all essential
consumers. A ring bus system supplies
all substations via two short circuit
current limitation reactors. Two fixed
pitch propellers, each driven by a
synchroconverter system, provide the
required propulsion power. Chiller and
thruster motors with direct on line start
are connected to the medium voltage
switchboard. Four filter circuits ensure
a low harmonic distortion factor.
Synchro-Converter Drive Design
Each propulsion motor is designed as
six phase salient pole synchronous
machine with air cooling. Both of the
winding systems are fed by separate
converters. This results for the motor in
a 12-pulse torque ripple and a smooth
operation. Each of this two converters,
which are feeding one motor, is supplied
by 2 parallel transformers with a 30°
shift for a 12-pulse line reaction. This
design provides an unchanged harmonic
signature with a 12 pulse line reaction
also in case of operation with only one
of the converters. The two converters
are consequently realised with their
own control, excitation and cooling-
circuits. The converter power section is
designed as direct water cooled
system to reduce the dimensions.
Switchboard Design
The 6,6 kV voltage switchboard is
designed in two separated parts
con-nected by SF 6 tie breakers. For
the main consumers like generators
SF 6 breakers are used, for the smaller
outgoing panels with a higher swit-
ching sequence contactors are used.
A very compact arrangement was
achieved with double stock compart-
ments. The substations operate with
separate SF 6 insulated switchboards
feeding three winding transformers.
Propulsion Redundancy Concept
The "Aurora" is equipped with an excep-
tional high level of redundancy. Beside
the two propulsion motors there are in
total four independent converters. One
converter is connected to one winding
system of the motor. It is controlled
and monitored by it´s own control
system. The same applies for the water
cooling circuit, where the power part of
each converter is separately cooled.
Each converter is even equipped with
an excitation system, which will be
automa-tically switched over in case of
a failure. Each converter uses separate
sensors, so the monitoring is indepen-
dent from each other. As special design
aspect each converter is designed
for 140% of it´s nominal power. This
built-in spare power will be activated
automatically, if only one converter is in
operation. A total converter power of
28 MW is therefore installed per shaftline.
Beside the lower temperature level in
normal operation mode this power
provides in case of operation with one
converter a very low reduction of
speed. Tests show a reduction of only
one knot. This allows the vessel to
maintain it´s time schedule.
Consequently all power and auxiliary
feedings for one shaftline are supplied
from different distribution switchboards.
Also the filter circuits follow the princi-
ple of redundancy. In case of a problem
with one of the filters, an unlimited
operation is possible without any
restrictions. The benefit of this concept
is an availability of a partial higher
propulsion power in case of a
converter failure.
Telediagnostic System
The propulsion system is equipped
with intensive diagnostic and failure
identifi-cation systems. A transient
recorder for storing data in a memory
is provided as standard since many
years for all SAM Electronics synchro-
converters. Now a telediagnostic
system is realised, which allows a
service engineer to perform an instant-
aneous evaluation of an event from his
home office via satcom. The service
engineer can perform the same analysis
as being locally at the converter board.
In many cases the failure can be
corrected by the ships staff engineers
by data transmission and phone/ fax
support via Satcom.
Filter circuits/ Quality of
the mains
Four filter circuits in total are provided,
each with an incorporated filter for the
5./7.th. and the 11./13.th harmonic
frequency. This configuration allows
SAM Electronics to guarantee a THD SAM Electronics GmbH
Energy and Drives
Behringstrasse 120
22763 Hamburg . Germany
Phone: +49 - (0)40 - 88 25 - 27 01
Fax:
+49 - (0)40 - 88 25 - 41 02
E-mail: info@sam-electronics.de
www.sam-electronics.de
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factor of <5% under all operating
conditions. This prediction was verified
by extensive measurements. The result
lies well under any classification
requirement and ships specification.
The filter circuits combine the reduc-
tion of the THD factor to specified
values with an improvement of the
power factor. This reduces the reactive
power and increases the efficiency. The
filters are switched depending on load
conditions in order to avoid a capacitive
power factor on the mains.
Monitoring concept
Distributed I/O´s for motor and transfor-
mers collect all data from analogue and
digital sensors. The collected data are
sent via a bus system to the converter.
This concept reduces the cabling effort
to only a bus system and the DC
supply cable between the main compo-
nents. Beside this are all data available
for monitoring purposes by the conver-
ter CPU. A bus transfer of all data to
the automation system is provided.
System Advantages
This advanced propulsion concept of
the P&O AURORA guarantees a very
high level of redundancy. This ensures,
that even with a fault in one of the con-
verters, the vessels time schedule will
be fulfilled. A high level of availability is
achieved by installing four independent
converters. In case of converter pro-
blems a telediagnostic system allows
world wide an immediate support by
specialists of the supplier.
The single line
shows the
arrangement of
the main supply
with the propul-
sion system.
The consequent
separation bet-
ween the
propulsion
ensures