Diesel generator

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It has been suggested that this article or section be merged into Engine-generator . (Discuss)

A diesel generator of 500kVA in a tourist resort in Egypt.
A diesel generator is the combination of a diesel engine with an electrical generator (often called an alternator) to generate electric energy. Diesel generating sets are used in places without connection to the power grid or as emergency power-supply if the grid fails. Small portable diesel generators range from about 1kVA to 10kVA may be used as power supplies on construction sites, or as auxiliary power for vehicles such as mobile homes.
Contents
1 Diesel generator set
2 Power plants - electrical "Island" mode
3 Supporting main utility grids
3.1 Peak Shaving
3.2 Grid support
3.3 Typical operating costs
3.4 Typical costs of conversion to paralleling for grid operation
4 Generator Sizing and Ratings
4.1 Rating
4.2 Sizing
5 Correct Generator Installation
6 Diesel engine damage due to mis-application or mis use of generating set
7 See also
8 References
9 External links
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Diesel generator set
The packaged combination of a diesel engine, a generator and various ancillary devices such as base, canopy, sound attenuation, control systems, circuit breakers, jacket water heaters, starting systems etc, is referred to as a generating set or a gen set for short.
While the larger industrial generators can range from 8kVA - 30kVA for homes, small shops & offices up to 2000kVA used for large office complexes, factories. A 2000 kVA set can be housed in a 40ft ISO container and be fully packaged and portable. Sizes up to about 5 MW are used for small power stations and these may use from one to 20 units. In these larger sizes the engine and generator are brought to site separately and assembled along with ancillary equipment
Diesel generators, sometimes as small as 250 kVa are widely used not only for emergency power, but also many have a secondary function of feeding power to utility grids either during peak periods, or periods when there is a shortage of large power generators.

Diesel generator on an oil tanker
Ships often also employ diesel generators, sometimes not only to provide auxiliary power for lights, fans, and winches, etc. but also for main propulsion. With electric propulsion the generators can be placed in a convenient position, to allow more cargo to be carried. Electric drives for ships were developed prior to WW I. Electric drives were specified in many warships built during WW II because manufacturing capacity for large reduction gears was in short supply, compared to capacity for manufacture of electrical equipment. [1] Such a diesel-electric arrangement is also used in some very large land vehicles.
Generating sets are selected based on the load they are intended to supply power for, taking into account the type of load, ie emergency or for continuous power, and the size of the load, and size of any motors to be started which is normally the critical parameter.
Power plants - electrical "Island" mode
One or more diesel generators operating without a connection to an electrical grid are operating in "island" mode. Several parallel generators provides the advantages of redundancy and better efficiency at part loads. An island power plant intended for primary power source of an isolated community will often have at least three diesel generators, any two of which are rated to carry the required load. Groups of up to 20 are not uncommon.
Generators can be electrically connected together through the process of synchronization. Synchronization involves matching voltage, frequency and phase before connecting the generator to a live bus-bar. Failure to synchronize before connection could cause a high current short-circuit or wear and tear on the generator and/or its switchgear. The synchronization process can be done automatically by an auto-synchronizer module. The auto-synchronizer will read the voltage, frequency and phase parameters from the generator and bus-bar voltages, while regulating the speed through the engine governor or ECU (Engine Control Module). Typical manufacturers are ComAp, GAC, Woodward and Heinzman who dominate this market
Load can be shared among parallel running generators through load sharing. Like auto-synchronization, load sharing can be automated by using a load sharing module. The load sharing module will measure the load and frequency at the generator, while it constantly adjusts the engine fuel control to shift load to and from the remaining power sources. As the prime mover of a diesel generator runs at constant speed, it will take more load when the fuel supply to its combustion system is increased, while load is released if fuel supply is decreased.
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