Load shedding by an electric utility

• US 8,682,498 B2
• Filed: 01/07/2012
• Issued: 03/25/2014
• Est. Priority Date: 07/07/2009
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Haugh, Julianne F.
• Primary Examiner(s): Ali, Mohammad
• Assistant Examiner(s): WHITTINGTON, ANTHONY T
• Application Number:
  US13/345,687
• Publication Number:
  US 20120109388A1
• Time in Patent Office: 808 Days
• Field of Search: 700/295, 705/412, 702/62
• US Class Current: 700/295
• CPC Class Codes: H02J 2310/60 Limiting power consumption in the network or in one section of the network, e.g. load shedding or peak shaving
• CPC Class Codes: H02J 3/144 Demand-response operation of the power transmission or distribution network
• CPC Class Codes: Y02B 70/3225 Demand response systems, e.g. load shedding, peak shaving
• CPC Class Codes: Y04S 20/222 Demand response systems, e.g. load shedding, peak shaving

Abstract

Load shedding by an electric utility, including querying power distribution systems that include a DRG system for present power consumption of the local load of the power distribution system; selecting, in dependence upon the present power consumption of the local load of the power distribution systems and predefined power consumption criteria for each substation, a substation to receive a reduction in power; and reducing power provided to the selected substation.

Claims

1. A method of participating in electric utility load shedding, the electric utility configured to provide electricity to one or more power distribution systems organized into one or more substations, at least one power distribution system in each substation comprising a distributed renewable generation (‘

DRG’

) system, the DRG system configured to provide power to the electric utility, a local load, and one or more batteries for storage, each power distribution system connected for data communications through a data communications network to the electric utility, the method comprising;

storing a predetermined threshold in a machine-readable recording media configured to be accessed by a control engine;

receiving from the electric utility, by the control engine of a power distribution system that includes a DRG system, a query for present power consumption of the local load of the power distribution system, wherein the present power consumption is a present power consumption rate;

retrieving the predetermined threshold from the machine-readable recording media by the control engine for use in comparing the predetermined threshold with a present state of charge of the one or more batteries;

determining whether the present state of charge of the one or more batteries of the power distribution system is greater than the predetermined threshold, wherein the predetermined threshold is defined by the present state of charge being sufficient for the one or more batteries to supply the local load of the power distribution system for a blackout of a predefined length of time;

implementing a policy of the DRG system of responding to the electric utility'"'"'s query with the present power consumption of the local load only if the present state of charge of the one or more batteries of the power distribution system is greater than the predetermined threshold,

making a determination that said present state of charge is not greater than the predetermined threshold; and

ignoring the query by declining to provide the present power consumption of the local load of the power distribution system in response to the determination that said present state of charge is not greater than the predetermined threshold.

2. The method of claim 1 wherein the DRG system further comprises a photovoltaic (‘

PV’

) system.

3. The method of claim 1 wherein the DRG system further comprises a micro-hydroelectric system.

4. The method of claim 1 wherein the DRG system further comprises a wind turbine system.

5. An apparatus for participating in electric utility load shedding, the electric utility configured to provide electricity to one or more power distribution systems organized into one or more substations, at least one power distribution system in each substation comprising a distributed renewable generation (‘

DRG’

) system, the DRG system configured to provide power to the electric utility, a local load, and one or more batteries for storage, each power distribution system connected for data communications through a data communications network to the electric utility, the apparatus comprising a computer processor, a non-transitory computer memory operatively coupled to the computer processor, the computer memory having disposed within it computer program instructions configured for;

storing a predetermined threshold in a machine-readable recording media configured to be accessed by a control engine; and

receiving from the electric utility, by the control engine of a power distribution system that includes a DRG system, a query for present power consumption of the local load of the power distribution system, wherein the present power consumption is a present power consumption rate;

retrieving the predetermined threshold from the machine-readable recording media by the control engine for use in comparing the predetermined threshold with a present state of charge of the one or more batteries;

determining whether the present state of charge of the one or more batteries of the power distribution system is greater than the predetermined threshold, wherein the predetermined threshold is defined by the present state of charge being sufficient for the one or more batteries to supply the local load of the power distribution system for a blackout of a predefined length of time;

implementing a policy of the DRG system of responding to the electric utility'"'"'s query with the present power consumption of the local load only if the present state of charge of the one or more batteries of the power distribution system is greater than the predetermined threshold;

making a determination that said present state of charge is not greater than the predetermined threshold; and

ignoring the query by declining to provide the present power consumption of the local load of the power distribution system in response to the determination that said present state of charge is not greater than the predetermined threshold.

6. The apparatus of claim 5 wherein the DRG system further comprises a photovoltaic (‘

PV’

) system.

7. The apparatus of claim 5 wherein the DRG system further comprises a micro-hydroelectric system.

8. The apparatus of claim 5 wherein the DRG system further comprises a wind turbine system.