Method, device, and system for controlling charging and discharging of energy storage apparatus

Patent metadata

Field	Value
Publication number	US-9825479-B2
Application number	US-201213716344-A
Country	US
Kind code	B2
Filing date	Dec 17, 2012
Priority date	Dec 26, 2011
Publication date	Nov 21, 2017
Grant date	Nov 21, 2017

Abstract

A charging/discharging control system of an energy storage apparatus includes a weather information collection module, a load information collection module, a load grouping module which classifies a plurality of loads into at least one load group based on a load correlation according to a predetermined condition, and an energy storage apparatus charging/discharging control module which determines a battery charging or discharging level per time slot of each of a plurality of energy storage apparatuses by using at least one of an estimated load amount of each load per time slot, a battery charging amount of the energy storage apparatus per time slot via solar generation, and a battery charging amount per time slot via system power, wherein a particular load corresponding to a lowest rate for a unit load is determined by using battery charging/discharging information and power rate information per time slot.

First claim

What is claimed is:

1. A method for controlling charging or discharging of an energy storage apparatus, the method comprising:
grouping, by a processor, a plurality of loads provided with a plurality of energy storage apparatuses into a plurality of load groups based on a load correlation which is calculated based on a predetermined condition;
determining, by the processor, a battery charging or discharging level per time slot of each respective energy storage apparatus provided to each corresponding load in the load group, wherein the determining the battery charging or discharging level comprises setting an initial value of an estimated load amount by using power consumption information per time slot in the load group, setting an initial value of a respective solar-generated battery charging amount and a respective grid-generated battery charging amount of the corresponding energy storage apparatus provided to each respective load in the load group, and determining a respective target charging amount per time slot for each of the plurality of the energy storage apparatuses that belongs to the load group by summing an estimated respective solar-generated battery charging amount and an estimated respective grid-generated battery charging amount;
operating said each respective energy storage apparatus based on the respective determined battery charging or discharging level;
determining a particular load indicating a lowest rate for a load by using battery charging/discharging information and power rate information per time slot, and generating an energy storage apparatus scheduling information based on the battery charging or discharging level corresponding to the determined particular load;
calculating an actual rate per time slot by using the rate in a previous time slot and an inverse of charging/discharging efficiency, and determining a time slot for which the calculated actual rate is lowest;
comparing a calculated actual rate of a first time slot which immediately precedes a time slot for which the estimated respective grid-generated battery charging amount is to be determined by using an electricity rate relating to the first time slot; and
compensating the estimated respective grid-generated battery charging amount based on a result of the comparing.

2. The method of claim 1 , wherein the classifying the plurality of loads comprises:
building a database configured to store at least one of environment information, weather information, and power consumption information relating to the plurality of the loads and that are collected in real time or during a predetermined period of time;
determining at least one load corresponding to an equivalent area, an equivalent date, and an equivalent weather condition based on information stored in the database;
calculating average power consumption information per date based on power consumption information corresponding to the determined at least one load; and
determining the load correlation based on the power consumption information corresponding to the determined at least one load and the calculated average power consumption information.

3. The method of claim 2 , wherein the classifying the plurality of loads further comprises:
determining, based on the determined load correlation, at least one load having same pattern as a set of loads which belong to an area having a highest load correlation according to the information stored in the database, and classifying the at least one determined load into same group.

4. The method of claim 1 , wherein the initial value of the estimated load amount is set as being equal to an average power consumption which is determined by using information relating to power consumption per time slot in the load group.

5. The method of claim 1 , wherein the initial value of the respective solar-generated battery charging amount is set as being equal to an average solar-generated battery charging amount which is determined by using information relating to a respective solar-generated battery charging amount per time slot in the unit of the load group, and the initial value of the respective grid-generated battery charging amount is set to zero.

6. The method of claim 1 , wherein the estimated respective solar-generated battery charging amount used for determining the respective target charging amount per time slot is determined as being equal to a maximum solar-generated battery charging amount of a corresponding time slot within a time slot in which the solar generation is available.

7. The method of claim 1 , wherein the estimated respective grid-generated battery charging amount used for determining the respective target charging amount per time slot is determined by:
calculating a sum of an estimated load amount per time slot by accumulating the estimated load amount per time slot, within a predetermined cycle, in the load group for a predetermined date; and
calculating a required respective grid-generated battery charging amount per time slot within the predetermined cycle by using the calculated sum of the estimated load amount and the respective solar-generated battery charging amount of a previous time slot.

8. The method of claim 1 , wherein, when the actual rate of the first time slot is less than the electricity rate of the time slot immediately preceding the first time slot, the method further comprises:
determining the estimated respective grid-generated battery charging amount by summing the actual respective grid-generated battery charging amount of the first time slot and the required respective grid-generated battery charging amount per time slot; and
compensating the required respective grid-generated battery charging amount per time slot by subtracting the actual respective grid-generated battery charging amount of the first time slot from the required respective grid-generated battery charging amount per time slot.

9. The method of claim 8 , further comprising:
determining a sum of a respective grid-generated battery charging amount per time slot based on a grid-generated battery charging amount per time slot within the predetermined cycle; and
comparing the determined sum of the respective grid-generated battery charging amount per time slot with the required respective grid-generated charging amount in a same time slot, wherein the determining the estimated respective grid-generated battery charging amount and the compensating the required respective grid-generated battery charging amount are repeatedly performed based on a result of the comparing.

10. The method of claim 1 , wherein the determining a battery charging or discharging level comprises:
determining a discharging level of the energy storage apparatus as being equal to a sum of the respective solar-generated battery charging amount per time slot and the respective grid-generated battery charging amount per time slot minus an estimated load amount per time slot.

11. The method of claim 1 , wherein the determining a particular load indicating a lowest rate comprises:
collecting the battery charging/discharging information including the solar-generated battery charging amount, the grid-generated battery charging amount, an actual load amount, and a battery discharging amount in the energy storage apparatus operated according to the operating of said each respective energy storage apparatus;
determining the particular load corresponding to the lowest rate for the unit load by using the battery charging/discharging information and the power rate information per time slot; and
scheduling an optimized charging/discharging level of the energy storage apparatus based on the solar-generated battery charging amount per time slot, the g

Assignees

• Kt Corp

Inventors

• Kim Min-Gyung
• Lee Min-Jin

Classifications

• H02J3/003 Primary

  Load forecast, e.g. methods or systems for forecasting future load demand · CPC title

• H02J2101/24

  Photovoltaics · CPC title

• H02J13/1337

  involving the use of Internet protocols · CPC title

• H02J13/1321

  using a wired telecommunication network or a data transmission bus · CPC title

• H02J13/1311

  using the power network as support for the transmission · CPC title