Energy management system, method, and device for multi-site energy management

Patent metadata

Field	Value
Publication number	US-10600135-B2
Application number	US-201615577063-A
Country	US
Kind code	B2
Filing date	Mar 22, 2016
Priority date	May 28, 2015
Publication date	Mar 24, 2020
Grant date	Mar 24, 2020

Abstract

To minimize the amount of calculation for changing an operation schedule even when there is an increase in the number of sites. A management computer calculates a first total schedule value, which is the total of the schedule values for each of the sites within a first time frame. If the first total schedule value exceeds a first target value set in advance, the management computer: calculates a first excess amount of the first total schedule value in relation to the first target value; selects, as a first site, a site subjected to a change in a demand schedule from a group of candidate sites satisfying a candidate criterion set in advance from among a plurality of the sites, the selection being performed on the basis of information on the facility characteristics for each of the sites; changes a first demand schedule of the first site in the first time frame; and transmits the changed first demand schedule to a control device of the first site.

First claim

The invention claimed is:

1. An energy management system comprising:
a management computer; and
a plurality of control devices which are provided at a plurality of sites, respectively, and connected to the management computer via a communication network,
wherein the management computer is configured to:
store information on facility characteristics which is provided at one or more sites of the plurality of sites and which indicates characteristics of a facility group that demands energy,
determine a result value of a past demand energy amount of the facility group and a demand schedule including a schedule value of the demand energy amount of the facility group for each time frame of a preset length, for each of the sites,
calculate a first total schedule value, which is the total of the schedule values for each of the sites within a first time frame, responsive to determining that the first total schedule value exceeds a first target value set in advance,
calculate a first excess amount of the first total schedule value in relation to the first target value,
select, as a first site, a site subjected to a change in a demand schedule from a group of candidate sites satisfying a candidate criterion set in advance from among a plurality of the sites, the selection being performed on the basis of information on the facility characteristics for each of the sites,
preferentially select at least one of a site having a predetermined calculation amount associated with the management computer due to a change in the demand schedule or a site having a predetermined execution accuracy of the demand schedule among the candidate site groups,
change a first demand schedule of the first site within the first time frame, and transmit the changed first demand schedule to a control device of the first site,
change the first total schedule value, the first excess amount, and a candidate site group on the basis of the changed first demand schedule,
select another site from the changed candidate site group such that the first total schedule value does not exceed the first target value, and
change a demand schedule of the another site;

wherein the control device for each of sites is configured to:
store the demand schedule of the site within the first time frame, and
control a facility group within the site on the basis of the demand schedule of the site in the first time frame.

2. The energy management system according to claim 1 , wherein the control device of each site is further configured to:
calculate a site prediction value that is a prediction value of the demand energy amount of the site within the first time frame,
determine whether the site prediction value exceeds the schedule value,
execute, in a case where it is determined that the site prediction value exceeds the schedule value, a control process for minimizing an increase in a demand energy amount of the site by controlling the facility group, and
notify the management computer of the control process.

3. The energy management system according to claim 2 , wherein, in a case where the first total schedule value exceeds the first target value, the management computer is further configured to select the first site from the candidate site group excluding the site under control processing and a site where the demand schedule of the first time frame is changed among the plurality of sites.

4. The energy management system according to claim 3 , wherein the management computer is further configured to:
calculate a second total schedule value, which is the total of the schedule value for each of the sites within a second time frame subsequent to the first time frame among the first time frame, responsive to determining that the second total schedule value exceeds a second target value set in advance,
calculate a second excess amount of the second total schedule value in relation to the second target value,
select, as a second site, a site subjected to a change in a demand schedule from a second group of candidate sites satisfying a candidate criterion from among a plurality of the sites, the selection being performed on the basis of information on the facility characteristics for each of the sites,
change a second demand schedule of the second site within the first time frame, and
transmit the changed second demand schedule to a control device of the second site.

5. The energy management system according to claim 1 , wherein a control device of each of sites is configured to display a demand energy amount of the site until a current time among the first time frame and a schedule value of the site of the first time frame on a display device.

6. The energy management system according to claim 1 , wherein the management computer is configured to display a first demand schedule of the first site within the first time frame and the changed first demand schedule on a display device.

7. The energy management system according to claim 1 , wherein the management computer is further configured to:
calculate a first site prediction value that is a prediction value of the demand energy amount of the first site within the first time frame on the basis of the result value of the first site, and
change the first demand schedule within the first time frame on the basis of the first site prediction value and the first excess amount.

8. The energy management system according to claim 1 , further comprising:
a site computer provided at a specific site among the plurality of sites and connected to the management computer via a communication network,
wherein the information on facility characteristics of the specific site indicates that the specific site has the site computer,
wherein, responsive to determining the first total schedule value exceeds the first target value, the management computer is further configured to:
select, as the first site, the specific site on the basis of the information on facility characteristics of each of the sites, and
transmit the first excess amount to the site computer;

wherein the site computer is configured to:
calculate the first site prediction value that is the prediction value of the demand energy amount of the first site within the first time frame on the basis of the result value of the first site,
change the first demand schedule within the first time frame on the basis of the first site prediction value and the first excess amount, and
transmit the changed first demand schedule to the management computer.

9. The energy management system according to claim 1 , wherein the information on facility characteristics comprises an adjustment capability of the schedule value by an adjustment facility that is a facility which can adjust the schedule value among the facility group, and
wherein the management computer is further configured to select, as the first site, a site having maximum adjustment capability among the candidate site group.

10. The energy management system according to claim 1 , wherein the information on facility characteristics comprises a processing time that is a time required for changing a demand schedule of a corresponding site in the past, and
wherein the management computer is further configured to select, as the first site, a site corresponding to a minimum processing time among the candidate site group.

11. The energy management system according to claim 1 , wherein the management computer is further configured to:
calculate a magnitude of an error in a result value in relation to a schedule value for each of sites, and
select, as the first site, a site corresponding to the minimum magnitude of the error among the candidate site group.

12. An

Assignees

• Hitachi Ltd

Inventors

• Nakano Michiki
• Ikeda Susumu
• Ikemoto Yu
• Fukumoto Takashi

Classifications

• G06Q10/06315

  Needs-based resource requirements planning or analysis · CPC title

• Y02B70/3225

  Demand response systems, e.g. load shedding, peak shaving · CPC title

• H02J3/00

  Circuit arrangements for AC mains or AC distribution networks · CPC title

• H02J3/38

  Arrangements for feeding a single network from two or more generators or sources in parallel; Arrangements for feeding already energised networks from additional generators or sources in parallel · CPC title

• G05B13/026

  using a predictor · CPC title