Reverse current protection & Management

S

Thread Starter

Saleem_khan

Power control
Case:1
The Solar ON-GRID system works with grid synchronization provide power to the load if excess send back to the grid.

Case:2
If grid fails it will be disconnected from the grid & S.P.V ON-GRID system works with the Generator in synchronization.

Here the problem is:

Suppose if there is no load, the Generator works on optimum speed and the S.P.V ON GRID System supply the rated power into the circuit as there is no load then there is a high possibility of Solar generated power entering into the Generator & could spoil the Generator,Its very important here to stop the reverse current from Solar System entering into the Generator.

As we know that the Solar generation from the Solar inverter can't be stopped,when working on D.G the power output from D.G to be reduce depending upon the requirements till its minimum power generation so as to reduce the Diesel & to keep the Solar & D.G working together.

Is there any solution? suggestion most welcome.

Thanks

Khan
 
Saleem_khan,

Hmmm... It seems you need some kind of PMS (Power Management System) to monitor the load on the system and, for example, stop the DG before the load gets too low, or shut down the solar PV inverter when the load gets too low. It would depend on the operating philosophy for the site.

It's certain this has been encountered before somewhere in the world and some kind of solution has been implemented. Have you checked with the suppliers of the equipment to see if they have any suggestions?

Have you considered using the DG to charger a battery storage system, as well as using the solar PV system to do the same, using an inverter on the battery to convert the DC to AC for use to power the load(s)? Though, at some point, you are still going to have to consider shutting down the DG if for no other reason than to conserve fuel.

Energy storage is probably a good solution to this dilemma, as well as enhancing electrical reliability and availability.

Please write back to let us know what you decide--and how it works out!
 
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