Method for managing power of energy storage system connected with renewable energy

1. A method for managing power of an energy storage system (ESS) connected to renewable energy, the ESS including an energy storage device connected to a power grid, a battery management system (BMS), a power conditioning system (PCS), and one or more renewable energy generation facilities producing electric energy from renewable energy, the method comprising the steps of:

determining a predicted power consumption amount of a power load and a predicted power production amount of the renewable energy generation facility (S 100 );

storing type and characteristics information of the renewable energy generation facility (S 200 );

predicting power production of the renewable energy generation facility based on the stored type and characteristics information (S 300 );

determining a required discharge amount for the energy storage device (S 400 );

determining whether a power shortage amount is equal to or greater than a predetermined value depending on the required charge amount of the energy storage device (S 500 );

determining whether the energy storage device is fully charged with the power production from the renewable energy generation facility if the power shortage amount is smaller than the predetermined value (S 600 ); and

controlling charging/discharging operation of the energy storage device according to a charge/discharge schedule.

2. The method of claim 1 , further comprising:

establishing an initial charge/discharge schedule of the energy storage device after step S 100 (S 150 ).

3. The method of claim 2 , further comprising:

holding the initial charge/discharge schedule of step S 150 if the power shortage amount is equal to or greater than the predetermined value in step S 500 (S 510 ).

4. The method of claim 3 , wherein the step of controlling charging/discharging operation includes charging the energy storage device according to the initial charge/discharge schedule from step S 510 (S 700 ).

5. The method of claim 2 , further comprising:

changing the initial charge/discharge schedule of step S 150 if the energy storage device is not fully charged with the power production of the renewable energy generation facility in step S 600 (S 800 ).

6. The method of claim 5 , wherein the step of controlling charging/discharging operation includes charging the energy storage device according to the changed charge/discharge schedule in step S 800 (S 900 ).

7. The method of claim 4 , wherein the charging of the energy storage device in step S 700 is performed by power supplied from the renewable energy generation facility and the power grid.

8. The method of claim 7 , wherein the charging by the power supplied from the power grid is performed at time when the lowest load rate is applied.

9. The method of claim 1 , wherein the predicted power production amount of the renewable energy generation facility in step S 100 is calculated as an average value of power production for a preset period.

10. The method of claim 1 , further comprising:

discharging the energy storage device according to the charge/discharge schedule (S 1000 ).

11. The method of claim 1 , wherein the renewable energy generation facility is a power generation facility using any one of sunlight, wind, tide, and biomass.

12. The method of claim 1 , wherein the PCS is in communication with an external server to manage the energy storage system.

13. The method of claim 1 , wherein the BMS is in communication with an external server to manage the energy storage system.

14. The method of claim 1 , wherein the energy storage device is a battery.