Method and system for managing power

1. A method for managing power in an energy management system to manage an electricity demand of a production process in an industrial facility supplied with power from a utility, comprising:

calculating in-facility distributed energy resources (DERs) based on price data provided by the utility in each time interval; and

modeling a task of the production process in the industrial facility so as to minimize an energy cost by reflecting the calculated in-facility DERs,

wherein the task is a processing operation which is performed in the production process,

wherein the modeling a task of the production process is performed based on a constraint for storage balance in each state of a state-task network (STN), such that the storage of each state is not less than a minimum value or is not greater than a maximum value, and the electricity demand in each time interval is increased or reduced regardless of price data when the storage of each state comes close to or reaches the minimum value or the maximum value.

2. The method of claim 1 , wherein the task comprises a non-schedulable task in which the electricity demand is not scheduled, and a schedulable task in which the electricity demand is scheduled.

3. The method of claim 2 , wherein the schedulable task comprises a plurality of operating points, and

wherein the plurality of operating points are detailed processing operations which are set by taking into consideration a consumption material which is consumed in the schedulable task, and a production material which is outputted from the schedulable task, and electricity demands on the plurality of operating points are different from one another.

4. The method of claim 3 , wherein the modeling the task comprises modeling to select an operating point of the schedulable task such that the electricity demand of the schedulable task increases when the price data is low and the electricity demand of the schedulable task is reduced when the price data is high.

5. The method of claim 1 , wherein the calculating the in-facility DERs comprises:

calculating first in-facility DERs which are charged or discharged in an energy storage system; and

calculating second in-facility DERs which are produced by an energy generation system.

6. The method of claim 5 , wherein the calculating the in-facility DERs comprises, when a unit price is low based on the price data, storing electricity in the energy storage system, and, when the unit price is high, discharging the electricity stored in the energy storage system.

7. The method of claim 5 , wherein the energy generation system comprises a non-schedulable energy generation system which is not able to schedule electricity production, and a schedulable energy generation system which is able to schedule electricity production.

8. The method of claim 7 , wherein the calculating the in-facility DERs comprises predicting electricity which is generated by the schedulable energy generation system based on previous records, and calculating electricity which is generated by the schedulable energy generation system based on the price data.

9. The method of claim 8 , wherein the electricity generated by the schedulable energy generation system is calculated by further considering an electricity production cost of the schedulable energy generation system.

10. The method of claim 1 , wherein the energy cost is derived by deducting a cost of selling the in-facility DERs from a cost of purchasing the in-facility DERs, and adding a cost of producing resources when the in-facility DERs comprise production resources.

11. A recording medium product which records a program code for performing the method according to claim 1 .