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microprocessor based alternator synchronisation ppt

Abstract:

The manual method of synchronization demands a skilled operator and the method is suitable for no load operation or normal frequency condition. Under emergency condition such as lowering of frequency or synchronizing of large machines a very fast action is needed, which may not be possible for a human operator. Thus there is a need of autosynchroniser in a power station or in an industrial establishment where generators are employed. This paper describes a microprocessor based set up for synchronizing a three phase alternator to a busbar. Also existing methods of synchronization are mentioned.

Microprocessor Based Alternator Synchronisation
Electrical load on power system varies and it never be constant. To economically meet the requirement of variable load and to assure continuous supply the number of generator unit connected to the system bus bar are varied suitably.

The synchronization requires fulfillment of various conditions like
(1) Same phase sequence
(2) Equality of frequency and voltage between incoming machine and bus.

At present the synchronization is done manually by using conventional analog instruments. The microprocessor based system of automatic synchronizer can be used more effectively compared to conventional methods of synchronization such as dark lamp method, bright lamp method and synchronization using synchronoscope this because of the fact that the conventional, method calls for of the operator and accuracy is less and it depends on the sense of correct judgment of the operator.

Moreover the microprocessor based alternator synchronizer is user friendly and requires less maintenance. It also exploits the advantage of superior performance of the microprocessor like accuracy speed and reliability.

Advantages Of Microprocessor Based Alternator Synchronisation

? Anticipatory close signal provides smooth synchronizing with minimum
system impact.
? Patented real-time adaptive proportional speed control algorithm provides
fast, reliable frequency matching while eliminating overshoots and
hunting. Includes smart target pulse to prevent hung scope condition.
(Patent #5,761,073)
? Highly flexible design can be configured for optimum performance over
a wide range of system characteristics from sensitive, asymmetrical low
inertia to high inertia hydro systems.
? One unit can control multiple systems with up to six different sets of
breaker closing parameters.
? Test module facilitates testing via front panel terminals.
? Standard 19 inch rack-mounted case with front cover.