Generator Grid Synchronization - Distributed Line, Dedicated Line

If you are synchronizing a generator with a substation (grid). Do you need a dedicated line from the generator to the grid - meaning all generated power is supplied directly to the grid? Or is it possible to distribute power along the way and connect to the grid?

If both the methods work. How would we synchronize generator and grid on the non-dedicated line? What are the advantages and disadvantages for both the techniques, assuming both work? What would we need other than a synchro scope?

Thanks, LS

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There is actually no difference You have, at the point of synchronism, i.e. at the switch between the incoming generator and the grid, a case where the whole of the grid- all generators, loads and lines - appears as a Thevenin source on one side of the switch. This presents a voltage and frequency. On the other side of the switch there is the generator-or even another grid-also a Thevenin source-which presents a voltage and frequency (I am ignoring phase rotation in polyphase machines as this is, presumably hard wired to be correct). Synchronisation simply involves matching the generator voltage -both phase angle and magnitude- so that they are the same as the system voltage magnitude and phase (matching phase implies matching frequency as one can't match phase if frequency differs). Then close the switch. If done perfectly, there will be no current flowing from the incoming machine to the grid. Then one can try to raise speed a bit to pick up real power and try to raise voltage to pick up reactive power.

If the incoming machine is supplying load and the switch is beyond this load - at the grid connection- then the matching should still be at the location of the switch- where the incoming and existing grid meet- this can mean controlling a remote generator or even an incoming grid. This is a bit more cumbersome than handling a single unloaded incoming generator (which is the usual condition) but the basic information and control is the same- match voltage and phase -A sychroscope simply shows the phase difference when frequency differences are low. A method of detecting voltage magnitude differences is also needed. A voltmeter will do. - --

Don Kelly remove the X to answer


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Don Kelly

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