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Tags: Microprocessor, Based, Alternator, Synchronisation,
 
 
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Microprocessor Based Alternator Synchronisation
Post: #1

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..

..
Post: #2
hi .. can u provide more info abt this topic
Post: #3
Video 
Please read this links
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.



Read this Papers carefully,Which Help you to Make A report

http://ieeexplore.ieeexpls/abs_all.jsp?arnumber=4116082
http://www.langford-assocproducts/basler/BE1-25A.pdf


http://en.wikipediawiki/Alternator_synchronization
Post: #4
i want more information on SYNCRONIZING OF ALTERNATOR USING MICROPROCESSOR
Post: #5
read this bit
Modern microprocessor relays have the ability to look at closing rate and inhibit the
breaker closing if the rate is too fast. IOW, if the generators are at different
speeds and the phases are rotating past each other. They also have time delays,
anticipation capabilities and even the ability to generate a rate signal to go to the
governor. allows completely automatic syncing, no operator involved.

For small machines only the simplest relay would be
necessary. The relay would simply close the paralleling contactor
when the phase difference was within the window.
Post: #6
i want to block diagram of this project
Post: #7
Microprocessor based synchronizer
a microprocessor based semi-automatic synchronizer for power systems is described in this paper. It does not require the conventional meters normally required for synchronizing.information regarding the status of the incoming generator is displayed by the system so that the operator can change machine speed and/or excitation.The required software has been implemented for a 8085A CPU based microprocessor. Here the error in the measurement of frequency can be made as low as 0.392%. Conventional systems like automatic turbine run-up system (ATRS) are much complex and as a result this synchroniser may find significant application in the relevant field. This apparatus is reliable and low cost and to be most suitable for captive power plants.Also it has been tested successfully in the laboratory with a three phase 220 V, 2.7 kVA alternator and the AC supply bus.

for more details, visit this link:
http://cat.inist.fr/?aModele=afficheN&cpsidt=2724450
Post: #8
can i get more information about this topic.like link,block diagram...
Post: #9
i need abstract of this topic
Post: #10
sir iam doing my btech 3rd year i wanted appt on microprocessor based alternator synchronisation
Post: #11
i want detail explanation about mp based alternator synchronisation
Post: #12
Microprocessor Based Alternator Synchronisation

ABSTRACT

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..
Post: #13


.doc  Automatic alternator synchronisation.doc (Size: 189 KB / Downloads: 153)

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.

INTRODUCTION
It is well known that electrical load on a power system or an industrial establishment, is never constant but it varies. To meet the requirement of variable load , economically and also for assuring continuity of supply the number of generating units connected to a system busbar are varied suitably . The connection of an incoming alternator to system bus, ie; synchronization requires fulfillment of the condition like the same phase sequence equality of voltages and frequency between the incoming machine and frequency between the in coming machine and busbar. In order to order to overcome the 9 technical drawbacks of the conventional synchronization methods we can introduce a microprocessor based system.

EXISTING METHODS OF SYNCHRONIZATION AND PRINCIPLE


a. Synchronizing Lamp

The operation of connecting an alternator parallel with another alternator or with a common busbar is known as synchronizing for proper synchronization of alternators the following three conditions must be satisfied

1. The terminal voltage of incoming machine must be the same as the busbar voltage.
2. The speed of the incoming machine must be same such that the frequency is equal to the busbar frequency.
3. The phase of the alternator voltage must be identical to the busbar voltage.

It means that the switch must be closed at the instant the two voltages are in correct phase.
Condition 1 can be checked with the help of voltmeter, frequency is adjusted by varying the prime mover speed. In the dark lamp method the lamps are connected across the alternator and busbar terminal. If the phase sequence is different, the lamps will brighten in a cyclic manner correct phase sequence is indicated by simultaneous darkening brightening of lamps. The switch is closed in the middle of the dark period. Once synchronized properly, the two alternators continues to run in synchronism.


b. sychroscope

The armature of the sychroscope will align itself so that the axis of windings are R and F are inclined at an angle equal to phase displacement between V and V’. If there any difference between the frequencies of V and V’ a pointer attached to the armature shaft will rotate at slip speed, and the direction of its rotation will indicate whether the incoming machine is running above or below synchronism. At synchronism, the pointer will remain stationary, but it must be brought to the particular position which indicates zero phase displacement between V and V’ before the main switch of the incoming generator is closed.

AUTOMATIC SYCHRONISATION

Synchronisation by means of manually operated switching served well enough when the individual generators were relatively small, but with the growth of system capacity, it becomes necessary to use automatic devices to ensure the closing of the main switch of the incoming machine at the proper instant.

The scheme introduced here is for the complete automation of synchronization i.e.; the adjustment of magnitude of voltage and frequency of incoming alternator is done automatically. When all the requirements of synchronisation are satisfied, closing of the main switch of the incoming machine is done by the automatic synchronizer


CRITERIA OF DESIGN

The auto synchronizer has been developed to carry out the following tasks related to the synchronization such as

I To check if the phase sequence of incoming machine is correct or otherwise, in case of wrong phase sequence, to terminate the further steps in the process and also to indicate corrective action.
II To check if frequency of incoming machine is equal to that of busbar and to adjust it to a value nearly equal to the busbar frequency.
III to check machine voltage is equal to that of busbar and to adjust it to a value nearly equal to the busbar voltage and
IV After ascertaining the fulfillment of the above condition, to give closing signal to the circuit breaker so that the breaker will close the exact inphase instant.

In addition, the auto synchronizer has been designed so that the alternator is started with in minimum voltage and minimum frequency conditions
Post: #14
can u send me more information on the above topic
Post: #15
this thread has much more information on Microprocessor Based Alternator Synchronization. you please download the attached files for more information
 

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