Hello,

Grid solar power systems are power grids that are enhanced with solar-based renewable technologies (Photo-voltaic Panels come to my mind) installed in some facilities and used to collect energy to pour it into the power grid. There are several implications involved in this generic approach:

1. Who is collecting the energy from the Sun? If they are former consumers, then they will be turned into "prosumers", able to provide energy for both their own consumption and to pour it to the power grid. This has a major impact, as it will require the modification of large parts of the power grid (Optimal Power flow, Demand response, integration of the renewable Energy Systems) to the point that it will be turned into a Smart Grid. If solar energy is collected by the Distribution System Operator (DSO) changes might not be that drastic, but the DSO will require a huge investment if it has not installed any previous solar energy facility.

2. Are the facilities collecting energy from the Sun going to be isolated from the power grid? If not, how is the Transmission System Operator going to deal with that power?

I hope this helps!

Example: Usually Solar PV  sysem produce direct current (DC) electricity which can be used for DC appliances. Now there are may of DC appliances pumps. refrigerator, lights ..., Or you may use an inverter (DC to AC (alternating current AC)

In case you produce much electricity you can connect your grid with the national or local grid. by this you can cell you surplus current to the grid (Upon certain agreement) 

I hope this is enough and simple. The connection method and procedure may follow later  

Good answered by Amity. Integration of power generated from PV system into the grid or the pool is what is termed the grid solar power system.