For hybrid solar project I am looking for a diesel generator protection system..
The solar system runs normally connected to the grid and excess power is normally exported to the grid.
My question arises when the grid is not available diesel generator is manually switched on and switched off when there is again grid power available. There are hours when the solar power exceeds the load of the system. Then excess solar power needs to be dumped.
- One option is to dump the power in an electric heater of the maximum solar capacity. I have considered an electric heater of the maximum solar capacity . This option wastes a lot of diesel fuel. Outages especially in the summer can be quite lengthly.
- I am presently looking into a power relay near the inverter that switches the solar array of when the grid power is unavailable. this requires a signal cable from the grid tied transformer to the inverter. we can not switch the power cable to the building where the solar army is an essential facility.
In this case the signal cable has to be longer than 100 m.
I would like to get suggestions for a better solution
Willem Jan Oosterkamp
Could be achieve by time based monitoring of current with the direction of flowing, using microprocessor, could be changed to micro controller after achieving reliability. Could refer my paper on “ Microprocessor based load shedding controller”.
Thank you for your answer this study unfortunately not applicable as our problem is that the load is lower than the instantenous power of the panels and the diesel has to be in standby to cover sudden higher power l3evels
If I understood well, the PV system is not gridforming, right? In that case a P(f) droop in the PV inverter could be a solution.
Than you for your contributions. We are now looking to see wether increasing the set point for frequency of the generator is possible and to have the PV inverter shut of at this frequency
Willem Jan
A total shut off is the solution used by many grid opeartors when diesel gen-sets replace the mains (e.g. during trafo maintenance). If the PV inverter supports limited frequency sensitive mode — overfrequency (LFSM-O) acc. to RfG https://www.entsoe.eu/network_codes/rfg/ the frequency control of the diesel can be used to control indirectly the feed-in of the PV. Thus savinf diesel and avoiding total PV shut off.
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