Method and system for reducing feeder circuit loss using demand response

• US 20100138065A1
• Filed: 02/11/2009
• Published: 06/03/2010
• Est. Priority Date: 02/11/2009
• Status: Active Grant

• Current Assignee: Accenture Global Services Limited (Accenture PLC)
• Original Assignee: Accenture Global Services Limited (Accenture PLC)
• Inventors: Taft, Jeffrey D.
• Granted Patent: US 7,778,738 B2
• Time in Patent Office: Days
• US Class Current: 700/295
• CPC Class Codes: H02J 13/00007 using the power network as support for the transmission
• CPC Class Codes: H02J 13/00034 the elements or equipment being or involving an electric power substation
• CPC Class Codes: H02J 2203/20 Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
• CPC Class Codes: H02J 2310/58 The condition being electrical
• CPC Class Codes: H02J 2310/64 The condition being economic, e.g. tariff based load management
• 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: Y02E 60/00 Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
• CPC Class Codes: Y04S 20/222 Demand response systems, e.g. load shedding, peak shaving
• CPC Class Codes: Y04S 40/121 using the power network as support for the transmission
• CPC Class Codes: Y04S 40/20 Information technology specific aspects, e.g. CAD, simulation, modelling, system security
• CPC Class Codes: Y04S 50/10 Energy trading, including energy flowing from end-user application to grid

Abstract

A system and method that analyzes at least one aspect of the power grid for demand response in order to reduce feeder circuit losses is provided. The system and method may use a demand response model to select one or more factors for the demand response (such as selecting a subset of customers for demand response from a larger pool of available demand response customers). The demand response model may include a grid structure component (such as an indication of the particular customer'"'"'s position in the grid) and a dynamic operation component (such as a real-time measurement of current in the feeder circuit). By using the demand response model, feeder circuit losses may thereby reduced.

Claims

1. In a power grid comprising at least one feeder circuit, a method for reducing loss in the feeder circuit comprising:

determining at least one of the grid structure of at least a part of the feeder circuit or current in the at least a part of the feeder circuit; and

based on determining at least one of the grid structure of the at least a part of the feeder circuit or current in the at least a part of the feeder circuit, selecting at least one customer on the feeder circuit for demand response in order to reduce the loss in the feeder circuit.

2. The method of claim 1, wherein determining at least one of the grid structure of the at least a part of the feeder circuit or current in the at least a part of the feeder circuit comprising determining both the grid structure and the current for the at least a part of the feeder circuit.

3. The method of claim 2, wherein determining both the grid structure and the current for the at least a part of the feeder circuit comprises:

using a model that provides an indication of the grid structure for the at least a part of the feeder circuit.

4. The method of claim 3, wherein the model that provides an indication of the grid structure is based on electrical distance of the at least a part of the feeder circuit from a substation.

5. The method of claim 4, wherein the model comprises a weighting factor based on the electrical distance of customers from the substation.

6. The method of claim 5, wherein the model comprises S[1−

e<sup>−

S0/S</sup>]

wherein S characterizes resistance as a function of distance for the feeder circuit, and

wherein S₀ comprises the electrical distance from the substation for customers in the feeder circuit.

7. The method of claim 6, wherein the model is further based on an indication of the current in the at least a part of the feeder circuit.

8. The method of claim 7, wherein the model is based on the current from the substation to the feeder circuit.

9. The method of claim 8, wherein the weighting factor for the customers in the feeder circuit is combined with the current from the substation in order to select the at least one customer, from the customers in the feeder circuit, for the demand response.

10. The method of claim 4, wherein the model that provides an indication of the grid structure is dependent on topology for the feeder circuit.

11. The method of claim 4, wherein the feeder circuit changes dynamically based on at least one switch;

and

wherein the grid structure component accounts for the dynamic changes in the feeder circuit.

12. In a power grid comprising at least one feeder circuit, a demand response management computer system for reducing loss in the feeder circuit comprising:

a processor operable to;

determine at least one of the grid structure of at least a part of the feeder circuit or current in the at least a part of the feeder circuit,

based on determining at least one of the grid structure of the at least a part of the feeder circuit or current in the at least a part of the feeder circuit, select at least one customer on the feeder circuit for demand response in order to reduce the loss in the feeder circuit, and

send at least one instruction for the demand response for the selected at least one customer.

13. The demand response management computer system of claim 12, wherein the processor is operable to determine both the grid structure and the current for the at least a part of the feeder circuit.

14. The demand response management computer system of claim 13, further comprising a memory;

and

wherein the processor operable to determine both the grid structure and the current for the at least a part of the feeder circuit comprises;

using a model stored in the memory that provides an indication of the grid structure for the at least a part of the feeder circuit.

15. The demand response management computer system of claim 14, wherein the model that provides an indication of the grid structure is based on electrical distance of the at least a part of the feeder circuit from a substation.

16. The demand response management computer system of claim 15, wherein the model comprises a weighting factor based on the electrical distance of customers from the substation.

17. The demand response management computer system of claim 14, wherein the model comprises S[1−

e<sup>−

S0/S</sup>]

wherein S characterizes resistance as a function of distance for the feeder circuit, and

wherein S₀ comprises the electrical distance from the substation for customers in the feeder circuit.

18. The demand response management computer system of claim 17, wherein the model is further based on an indication of the current in the at least a part of the feeder circuit.

19. The demand response management computer system of claim 18, wherein the model is based on the current from the substation to the feeder circuit.

20. The demand response management computer system of claim 19, wherein the processor is operable to combine the weighting factor for the customers in the feeder circuit with the current from the substation in order to select the at least one customer, from the customers in the feeder circuit, for the demand response.