diesel-electric drives by man diesel
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8/8/2019 Diesel-Electric Drives by MAN Diesel
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Diesel-Electric DrivesLower emissions, greater reliability
8/8/2019 Diesel-Electric Drives by MAN Diesel
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MAN B&W Diesel3Diesel-Electric Drives – Lower emissions, greater reliability
MAN Diesel & Turbo
The responsible way in leading technology
MAN Diesel & Turbo is the world’s leading designer and manufacturer of low and
medium speed engines – engines from MAN Diesel & Turbo cover an estimated
50% of the power needed for all world trade. We develop two-stroke and four-
stroke engines, auxiliary engines, turbochargers and propulsion packages that are
manufactured both within the MAN Diesel & Turbo Group and at our licencees.
More than ever before, MAN Diesel & Turbo’s development focus is the environ-
mental performance of our engines. Using our unrivalled grasp of large engine
technology, we aim to make our engines progressively cleaner, more powerful and
more efficient.
We are firmly committed to reducing emissions while increasing fuel efficiency and
power density. This includes an active partnership with environmental institutions
and development banks. For our customers, it means engines and system pack-
ages that result in powerful yet clean prime movers.
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4 Diesel-Electric Drives – Lower emissions, greater reliability
MAN B&W Diesel5Diesel-Electric Drives – Lower emissions, greater reliability
MAN Diesel & Turbo: Electric PropulsionReliability and reduced emissions
Looking to the future
The global maritime industry faces major challenges:
meeting new environmental and safety standards,
especially in terms emissions, without sacrificing
profitability or efficiency. MAN Diesel & Turbo under-
stands these pressures. We are working to give the
industry long-term solutions.
Ready for IMO Tiers II and III
The International Maritime Organisation’s IMO MAR-
POL 73/78 Annex VI is phasing in increasingly
stringent limits on nitrogen oxide (NOx) emissions.
The shipping industry needs to be prepared for the
second and third stages of regulations, IMO Tier II
and IMO Tier III, which will enter into force in 2011
and 2016.
At MAN Diesel & Turbo, we are helping our customers
to plan ahead. We announced a full range of IMO
Tier II-compliant low and medium speed diesel
engines in 2008 – a full shipbuilding cycle ahead of
IMO Tier II’s introduction.
Now, MAN Diesel & Turbo is offering solutions that
are already compliant with IMO Tier III – ensuring the
shipping industry is even better placed for the future.
Why propulsion systems matter
Besides emissions, increased environmental aware-
ness is leading to a range of restrictions on shipping.
For example, to minimise the damage to coral reefs,
vessels need to maintain their position without
anchoring. This requires smooth running and accurate
control.
But environmental considerations are not the only
factor. At sea, reliability is crucial. Moreover, propul-
sion plants must meet safety requirements while
maintaining profitability, through fuel efficiency.
The advantages of diesel-electric
Diesel-electric drives meet all these needs and more.
They offer a host of benefits, including reduced fuel
consumption, lower emissions, safe and reliable
propulsion, improved manoeuvrability, and high re-
dundancy.
In particular, diesel-electric drives are effective in
meeting fluctuating power demands: multiple smaller
engines can be either switched off or run at full load,
providing greater flexibility and efficiency.
For a real-world example of these benefits, take ferries
that provide regular services across fjords and other
waterways. Electric propulsion's superior manoeuvra-
bility has significantly reduced fuel consumption and
improved on-time running. So it's not surprising that
the latest models are fitted with diesel-electric drives.
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6 Diesel-Electric Drives – Lower emissions, greater reliability
MAN B&W Diesel7Diesel-Electric Drives – Lower emissions, greater reliability
MAN Diesel-Electric Applications An increasingly attractive source of propulsion
The time has come
Electric propulsion is not a recent innovation. But
only lately has it become a viable alternative, as the
technology has improved and components have
come down in cost. Over the last twenty years elec-
tric propulsion, combined with medium-speed diesel
engines, has been employed in increasing numbers
of consumers. Today, hundreds of different types of
ships are powered by diesel-electric drives, in a large
variety of configurations.
How it works
How does a diesel-electric plant work? Diesel-driven
generators provide electric power for both propulsion
and onboard purposes. For maximum efficiency,
MAN Diesel & Turbo ensures that the number of gen-
sets matches the total power demand. Electric power
is distributed via the main switchboards.
Variable speed propulsion drives, which include elec-
tric propulsion motors and frequency converters,
are another key component. Frequency converters
control the speed of the propulsion motor by varying
frequency and voltage.
Electric-powered azimuth thrusters or pods improve
propulsion efficiency and positioning capability.
Available in various configurations for transit, ma-
noeuvring and station keeping, these are increasingly
common in many types of vessels.
Sample Diesel-Electric Drive of
a Platform Supply Vessel
Propulsors (azimuth thrusters)
Diesel engines
Generators
Main switchboards
Supply transformers
Frequency converters
Electric propulsion motors
Advances in technology have made electric propulsion a field with high potential.
And there is no better way to exploit this potential for your application than with a
MAN Diesel & Turbo diesel-electric drive.
MAN Diesel & Turbo provides
complete packages, ensuring
perfectly matched components
and streamlined systems
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8 Diesel-Electric Drives – Lower emissions, greater reliability
MAN B&W Diesel9Diesel-Electric Drives – Lower emissions, greater reliability
The Advantages of Diesel-ElectricEfficient, high-performance propulsion
More flexibility in location of propulsors – because
the propulsors are supplied with electric power
through cables, they do not need to be adjacent to
the prime mover.
Lower propulsion noise and reduced vibrations, as
reduction transmissions are often not required.
Effective performance in icy conditions, as the sys-
tem can provide maximum torque at low speed.
Lower fuel consumption and emissions due to the
possibility to optimize loading of engines. Connect-
ed constant-speed engines operate at full load,
with maximum efficiency.
Reduced life cycle costs, resulting from lower fuel
consumption and maintenance costs. In particular,
this applies to vessels that have a large variation in
load demand: for example, dynamic positioning
(DP) vessels, which divide their time equally
between transit and station-keeping operations.
High reliability, due to multiple engine redundancy.
Even if an engine malfunctions, there will still be
sufficient power to operate the vessel safely.
Reduced vulnerability to a single point of failure,
providing the basis for compliance with redundancy
requirements.
Improved manoeuvrability and station-keeping
ability, by deploying special propulsors such as
azimuth thrusters or pods.
Increased payload, as diesel-electric systems take
up less space.
Diesel-electric applications by MAN Diesel & Turbo are designed to meet our
customers’ highest expectations. We offer full diesel-electric packages, includ-
ing everything from gensets to propulsors, including switchboards, converters,transformers and motors. Our packages offer a host of benefits, including:
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10 Diesel-Electric Drives – Lower emissions, greater reliability
MAN B&W Diesel11Diesel-Electric Drives – Lower emissions, greater reliability
Typical Diesel-Electric Applications
Offshore support vessels
Electric propulsion is the norm in ships that frequently
require dynamic positioning (DP), such as platform
supply vessels, diving support vessels or pipe layers.
Initially these vessels mainly used variable speed
motor drives and fixed pitch (FP) propellers; now, they
mostly deploy variable speed thrusters.
In light of the lifetime benefits shown by economic
analyses, advanced anchor handling tug supply
(AHTS) vessels are increasingly being equipped with
hybrid diesel-mechanical and diesel-electric propul-
sion.
For vessels with a diverse range of activities, diesel-
electric propulsion delivers significantly lower fuel
consumption and emissions compared to convention-
al mechanical propulsion. Ship owners have reported
fuel savings of between 15 – 25 per cent, depending
on the operational profile, and even 30 – 40 per cent
in low-load DP operations.
Passenger vessels
Passenger vessels - cruise ships and ferries - are an
important segment of shipping with a particularly
demanding freight: passengers. Onboard comfort is a
high priority, requiring low noise levels and vibrations
from the ship’s machinery. Electrical propulsion can
provide just that.
But comfort is not the only imperative: safety is para-
mount. Existing regulations, such as the International
Convention for the Safety of Life at Sea (SOLAS), as
well as forthcoming “Safe Return to Port” require-
ments, stipulate both reliability and availability. In this
respect, the advantages of diesel-electric propulsion
are well known.
Not only are diesel-electric systems highly reliable,
they are also cost-efficient. For example, podded
propulsion increases propulsion efficiency by eight to
ten per cent. In addition to significantly reducing fuel
costs, these pods also improve manoeuvrability. As a
result, more and more cruise ships are being built with
diesel-electric systems.
Oil and gas exploration and production
Until quite recently, oil and gas wells were located in
shallow waters, where they could be drilled by jackup
rigs or drilling barges. When these shallow-water fields
became depleted, oil and gas companies moved into
deeper waters. However, these reservoirs can only be
tapped by large semi-submersible rigs or drillships,
which require a large quantity of electric power.
Not surprisingly, electric propulsion has become the
leading design for vessels in many offshore oil and
gas fields, including the North Sea and Brazil. And it
is becoming increasingly popular in new fields, as
oil companies seek to reduce operating costs and
emissions.
Dredgers and construction vessels
Craft that operate in shallow waters, such as dred-
gers, construction vessels and windmill installation
vessels, also benefit from diesel-electric propulsion
and station-keeping.
In these applications, electric propulsion meets a
number of criteria, such as accurate manoeuvrability,
fuel economy, and the ability to move working
place frequently. In vessels with a large ship service
electrical system, the ship service and propulsion
power generators can be combined, achieving higher
redundancy and making better use of installed power
capacity.
In addition to DP systems, drillships and semi-sub-
mersibles are equipped with azimuth thrusters, which
are capable of propelling the vessel in any direction.
These thrusters are integrated into the vessel’s
control system, which uses satellite-positioning
technology. In conjunction with sensors located on
the drilling template, this ensures that the ship is
directly above the drill site at all times.
A typical installation consists of either two or three
separate engine rooms, depending on its DP classifi-
cation. Flexibility, availability and operational maintain-
ability are essential in these vessels – making diesel-
electric systems an ideal source of propulsion.
Shuttle tankers
Shuttle tankers are used to transport oil from offshore
facilities (platforms or floating, production, storage
and offloading, or FPSO vessels) to a processing or
storage terminal onshore. Many different offloading
methods are used. Most of them require the tankers
to maintain a fixed position (station keeping) with high
accuracy, even in changing conditions. To achieve
this, most shuttle tankers are equipped with a DP
system and electric tunnel or azimuth thrusters.
Many applications involve a high degree of redundan-
cy in propulsion for transit and station keeping. These
solutions normally comprise a redundant power
generation and distribution system, with redundant
propulsion converters and a tandem or redundant
propulsion motor.
Diesel-electric drives have a variety of applications. In fact, electric propulsion’s
numerous advantages make it an asset in a diverse range of highly-specialised
vessels.
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12 Diesel-Electric Drives – Lower emissions, greater reliability
MAN B&W Diesel13Diesel-Electric Drives – Lower emissions, greater reliability
A Made-to-Measure Diesel-Electric ApplicationMAN’s methodology means the right diesel-electric
system for you
Start
End
Ship data
Speed − power
estimation
Electrical load
analysis
Engine
selection
Switchboard
layout
Drive and propulsion
motor design
Check
DE plant
Type of vessel
Propulsion type: shaft line, thrusters, pods, etc
Operational profile
Class notation: propulsion redundancy, ice class, etc
Ship design points
Propulsion power: at sea, manoeuvring, at port, etc
Sea margin
Electrical power: at sea, manoeuvring, at port, etc
Efficiency of DE plant: typically 91%
Efficiency of alternators: typically 96% - 97.5%
Number und type of engines/gensets: power installed, etc
Max. allowed loading of engines: % of MCR
Maintenance of engines: at sea operation, at port, etc
Frequency choice: 50/60 Hz
Voltage choice: low voltage, medium voltage
Number of switchboard sections
Alternator parameters: cosφ, xd"
Selection of converter type: PWM, LCI, etc
Selection of pulse number: 6p, 12p, 24p
Selection of supply transformer: possibility of transformer less
configuration (active front end)
Selection of E-propulsion motor and no. of windings
THD mitigation method
Check Isc" : increase voltage, optimize xd", etc
Check availability of reactive power: change number/type of
alternators, cosφ, etc
Check THD limits: increase pulse number, add filters, etc
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440V
1200 kW
3000kW
690V,60Hz
M
M
M
440 V
1335kW 3000 kW 1335 kW
1000kVA 1000 kVA
M
2 x 9L27/38
2970 kW mech
720 rpm
2851 kW el
2x 9L27/38
2970kW mech
720rpm
2851kW el
Multi-Purpose Offshore Support Vessel
Main Dimensions:
Length over all: 131.70 m
Deadweight at design draught: 6,850 t
Speed:
Trial speed at design draught: 13.0 kn
DP System:
Class: DP3
Four main generator sets:
MAN 9L27/38
Maximum output: 2,970 kW
Engine speed: 720 rqm
Alternators
Maximum output: 2,980 kVA
Voltage: 690 Volt
Frequency: 60 Hz
Thrusters:
Two azimuth thrusters (aft) with variable speed drive and CPP:
3,000 kW each
Two tunnel thrusters (fwd, CPP): 1,335 kW each
One retractable azimuth thruster (fwd, CPP): 1,200 kW
Example of a Diesel-Electric System Package
Single Line Diagram
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14 Diesel-Electric Drives – Lower emissions, greater reliability
PrimeServ – peace of mind for life
With more than 150 PrimeServ service stations and
service partners worldwide, plus our growing network
of PrimeServ Academies, the MAN Diesel & Turbo
after-sales organisation is committed to maintaining
the most efficient and accessible after-sales organisa-
tion in the business.
PrimeServ’s aim is to provide:
Prompt delivery of high demand OEM spare parts
within 24 hours
Fast, reliable and competent customer support
Individually tailored O&M contracts
Ongoing training and qualification of service personnel
Global service, open 24 hours-a-day, 365 days-a-year
Diagnosis and troubleshooting with our high perfor-
mance Online Service
Retrofitting of the latest MAN Diesel & Turbo
engine and turbocharger technologies for improved
operating economy and minimised emissions
The PrimeServ offering
Based on almost 110 years of service experience
with marine diesel engines, our sophisticated
logistics system ensures that all frequently requested
spare parts are available worldwide within 24 hours.
In addition, MAN Diesel & Turbo Online Service
helps to optimise maintenance cycles by the use
of remote engine monitoring, diagnostics and cali-
bration. The resulting condition-based maintenance
(CBM) promotes high availability, increases opera-
tional safety, shortens downtimes and enhances the
performance of MAN Diesel & Turbo marine engines.
The bottom line: leaner operating costs and better
planning for you.
When service is required, the MAN PrimeServ network
responds to organise assistance as fast as possible.
This guarantees rapid completion of maintenance
work and high availability of MAN Diesel & Turbo
engines, GenSets, turbochargers, gears, propellers
and marine propulsion packages.
In short: MAN PrimeServ gives you the benefit of our
specialist expertise in marine power so that you can
concentrate on your own core business.
World Class After Sales Support
For marine propulsion and GenSets
Service Facilities
(Service Centres,
Authorized Repair Shops,
Spare Parts Stocks)
Agencies
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MAN Diesel & Turbo
86224 Augsburg, Germany
Phone +49 821 322-0
Fax +49 821 322-3382
info-de@mandieselturbo.com
www.mandieselturbo.com
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