IEEE Electrification Magazine - September 2017 - 69

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to the environment, and unwanted downtime during
operation. The associated loss of revenue and increased
cost for the clients can be severe. It is important to
improve methods for testing and verification of hardware and software using enhanced simulation technology and laboratory testing.
The trend in the maritime industry is toward increased
levels of autonomy. This will put even more requirements
on relevant and effective testing methodology in a lifecycle perspective. It is likely that new sky-based remote
test services, monitoring and diagnosis of onboard systems, and logistics handling using digital representations
combined with physical data from operations of the ship
owner's assets, so-called digital twins, will enable far more
efficient software upgrading, including hardware/softwarein-the-loop testing, without taking the ship out of service
more than necessary. Remote monitoring and control from
land-based operational centers with the ability to remotely
access the fleet of ships will also increase safety and operational efficiency.

Hybrid Marine Power Plant

The electric energy production may be powered by a
hybrid marine power plant consisting of diesel or gas
engines and integrated energy storage devices (ESDs) such
as banks of batteries. Proper design and control systems
can deliver significant fuel savings to make the ships
greener and safer.
The power and energy management system controlling the electrical power distribution, start and stop of
generators, and the loads for propulsion, crane, drilling,
ventilation, and so on, is crucial to ensure safe and efficient operations. Successful operations of electrically
powered vessels depend on advanced integrated software to control functionality. Consequently, improper
power plant designs and software-related problems,
often in conjunction with hardware and human error,
may lead to unacceptable risk, increased gas emissions

A recent development in the regulations, i.e., class societies such as DNV GL, enables the use of ESDs as an
alternative to back-up generators in a marine power
plant. Traditionally, a marine power plant consists of
several diesel-generator sets connected to an ac or dc
distribution system (power bus) separated by bus-tie
breakers. In a hybrid marine power plant, the generators
are assisted by the presence of ESDs such as batteries,
supercapacitors, and fly wheels (Figure 2). We have been
investigating the potential to use batteries. An ESD is a
device that can charge up and store energy and deliver it
on demand.
As in the automotive industry, hybrid power plants on
ships will improve safety and energy efficiency because
they can reduce fuel consumption, emissions, and power
fluctuations. The propulsion motors are usually the largest power consumers on ships, depending on the environmental loads and modes of operation (transit, DP, etc.).
In addition, there are usually several motors, frequency
IEEE Elec trific ation Magazine / S EP T EM BE R 2 0 1 7

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Table of Contents for the Digital Edition of IEEE Electrification Magazine - September 2017

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