Power Synchronization: Pros and Cons

What do you mean by "synchronized power system "?

Suppose I have I number of Diesel generator for high rise building , so we do synchronization in high tension (step up the DG voltage and synchronize and then distribute the power in high tension in 20 KV, in some area we put step down transformator the reduce the voltage to become usage voltage 220 /400 V.

Another example case, we have gas engine synchronizing with prime power in high tension side. Why does M&E Consultant design like that? what is the consideration?It's also can synchronized in low tension side, I think

thx

Considering the fault level & transmission it can be design,You can also take synchronization facility at lower voltage level but at that level due to multiple generting source will be in that busbar and your fault level will be always higher at LT side(In terms of Current in kA) compare to HT side.

And also in some case it can not be physible also to synchronization at lower side due to higher size of busbar & Switchgear & constraint of space there are lots of other factors also to be considered.

In the view of above discussion i suggest to check fault level & size of all Switchgear component considering the synchronization at LT as well as HT side,You definitely will get your answer.

thanks

SJ

Adrian,

As I know, the synchronization process involves equalizing voltage and frequency. So wherever you put something in parallel, all generating units have to generate power at the same voltage and frequency. This is valid at the point of connection.

So in case of any parts of the system involving a primary (the first part in the direction of the energy flow, source part) part and a secondary ( load part), the primary part has to be synchronized.

If you want to connect the secondary (lower transformer voltage, load part) parts in parallel (while the primaries are in parallel), the secondary frequency is the same, the voltage is usually adjusted via voltage taps.

So what synchronizing besides the one mentioned above were you refering to ?

In residential areas (high rise buildings) is it permitted to use 20KV lines ? Aren't the generators located away, brought to the building substation and stepped down ? In this case the answer is simple, instead of bringing lines separately, you create a grid or hook up to the grid, and distribute the loads as if from a single generator, exactly what is done in case of main grids. In case your generators are additional to the main grid then it is obvious that you synchronise to the grid too.