science

Power management system

Power management system is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Power management system rather than just read about it. In short: On marine vessels the Power Management System PMS is in charge of controlling the electrical system. Its task is to make sure that the electrical system is safe and efficient.

Key takeaways

Power management system belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Power management system to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Power management system from memory before moving on to harder problems.

Reference excerpt

On marine vessels the Power Management System PMS is in charge of controlling the electrical system. Its task is to make sure that the electrical system is safe and efficient. If the power consumption is larger than the power production capacity, load shedding is used to avoid blackout. Other features could be to automatic start and stop consumers (e.g., diesel generators) as the load varies.

A complete switchboard and generator control system The marine Power Management System PMS is a complete switchboard and generator control system to synchronize the auxiliary engines of the ships by implementing automatic load sharing and optimizing the efficiency of the power plant. It handles various configurations of generators driven by diesel engines, steam turbines, and main engines in combination with switchboards of various complexity.

Power Management System PMS Operation Electrical energy in any combination of the Generators is implemented according to calculations of the electric power tables of each vessel. PMS System decides which Generators combination will be the best according to the Load Consumptions. The capacity of the Generators is such that in the event of any one generating set will be stopped then it will still be possible to supply all services necessary to provide normal operational conditions of propulsion and safety. Furthermore, it will be sufficient to start the largest motor of the ship without causing any other motor to stop or having any adverse effect on other equipment in operation. In general a PMS Power Management System performs the following functions on a Ship:

Automatic Synchronizing Automatic Load Sharing Automatic Start/Stop/Stby Generators according to Load Demand Large Motors Automatic Blocking Load Analysis and Monitoring Three (3) Phase Management and Voltage Matching Redundant Power Distribution Frequency Control Blackout Start Selection of Generators Priority (first leading main, second and third standby generator in sequence) Equal Load Division between generators Tripping of non-essential load groups (load shedding in two steps) Blocking of heavy consumers Operation of second generator in case first generator will be loaded 80% of its capacity Operation of standby generator, in case of malfunction in any one of the two generators Manual, secured, semi-automatic and automatic mode operation selection of generators Control selection for generators in engine control room

Power Management System PMS Benefits Diesel generator monitoring and control Diesel engine safety and start/stop Circuit breaker synchronize & connect Bus line voltage and frequency control Generator voltage and frequency control Generator load in KW and % Symmetric or asymmetric load sharing Load control with load shedding Separation of alarm, control and safety Single or multiple switchboard control Heavy consumers logic Automatic start and connect after blackout Automatic line frequency adjustment Control of diesel electric propulsion "Take me home mode", control of PTI with clutches etc. "One touch auto sequence", automatic mode control

Power Management System PMS Applications on Vessel Types Tanker (ship) Bulk Carrier General Cargo Ship Container Ship LNG carrier / LPG carrier / Gas carrier Cruise Ship Yachts

References

3. http://www.km.kongsberg.com/ks/web/nokbg0240.nsf/AllWeb/A297BDC3A79BBB36C125726B00387597?OpenDocument 4. ABB Marine, Integrated Automation System

Worked examples

Example 1 — a first encounter with Power management system

Start with the simplest possible case. Write down what Power management system claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Power management system before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Power management system ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Power management system

In research: Power management system appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Power management system in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Power management system is common in secondary-school and first-year university syllabi. It links to neighbouring topics Electric power, Electrical power control, so understanding it makes those chapters shorter.
In everyday life: Look for Power management system outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Power management system in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Power management system means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Power management system out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Power management system in simple terms?

On marine vessels the Power Management System PMS is in charge of controlling the electrical system. Its task is to make sure that the electrical system is safe and efficient.

Why does Power management system matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Power management system?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Power management system.