Method and system for distributed power management

• US 8,788,108 B2
• Filed: 02/14/2012
• Issued: 07/22/2014
• Est. Priority Date: 08/14/2009
• Status: Active Grant

• Current Assignee: ABB Schweiz AG (ABB Limited)
• Original Assignee: ABB Technology Limited (ABB Ltd.)
• Inventors: Kulathu, Ganesh, Nykvist, Martin, Wimmer, Wolfgang, Van Der Wal, Otto
• Primary Examiner(s): JARRETT, RYAN A
• Application Number:
  US13/372,990
• Publication Number:
  US 20120239216A1
• Time in Patent Office: 889 Days
• Field of Search: None
• US Class Current: 700/295
• CPC Class Codes: H02J 13/00034 the elements or equipment being or involving an electric power substation
• CPC Class Codes: H02J 13/0004 involved in a protection system
• 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: Y02E 60/00 Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
• CPC Class Codes: Y04S 10/18 using switches, relays or circuit breakers, e.g. intelligent electronic devices [IED]
• CPC Class Codes: Y04S 20/222 Demand response systems, e.g. load shedding, peak shaving

Abstract

A method and system for distributed power management with individual IEDs in a substation are disclosed. An exemplary technique can include providing multiple IEDs in a power network in the substation and integrating an intrinsic load shedding function in each IED. The technique can include identifying a power imbalance state at an individual IED and load shedding the individual IED using an intrinsic load shedding function when a power imbalance state is identified in a coordinated manner to achieve distributed power management in the substation.

Claims

1. A method for distributed power management in an electrical power network divided into one or more sections and having plural intelligent electronic devices (IEDs) communicatively connected in a communication network configured for power management function in the one or more sections of the electrical power network, the method comprising:

identifying a first IED from the plural IEDs in a section of the electrical power network that issues a load shed command;

exchanging power network data between the first IED and one or more IEDs from the plural IEDs in the electrical power network, the data including at least power balance calculation values and an accumulated load value;

having the first IED or a second IED of the plural IEDs in the electrical power network identify a power imbalance state in the electrical power network based on the exchanged power network data and generate a load shed trigger in the electrical power network based on at least the accumulated load value as compared with a priority set for an electrical circuit associated with the first IED;

having the first IED estimate a power balance condition in the electrical power network based on the load shed trigger generated in the electrical power network; and

having the first IED or the second IED perform coordinated power management in the electrical power network based on the estimated power balance condition in the electrical power network.

2. The method of claim 1, wherein the plural IEDs in the electrical power network are configured to dynamically identify the first IED in the electrical power network.

3. The method of claim 1, wherein the first IED is a preconfigured Master for the section of the electrical power network for power management.

4. The method of claim 1, wherein the first IED is a load/motor feeder IED in the electrical power network.

5. The method of claim 1, wherein the exchange of power network data is with at least one IED from a different section in the electrical power network from the section having the first IED.

6. The method of claim 1, wherein the second IED is a load/motor feeder IED in the electrical power network.

7. The method of claim 1, wherein the second IED is an IED from a different section in the electrical power network from the section having the first IED.

8. The method of claim 1, wherein the estimation of power balance condition in the electrical power network is based on managing one or more sections or loads assigned with a priority.

9. The method of claim 1, wherein the estimation of power balance condition in the electrical power network is based on status of at least one critical circuit breaker.

10. The method of claim 1, wherein distributed power management in the electrical network is carried out with load shed commands in at least one section of the electrical power network by the first IED in the at least one section.

11. The method of claim 1, wherein distributed power management in the electrical network is carried out by issue of a load shed command by a first IED to control a circuit breaker managed by the first IED.

12. The method of claim 1, wherein the distributed power management in the electrical network is coordinated with having at least one IED in the electrical power network having a programmed time delay for power management defined based on a priority of the section managed by the IED and/or power equipment managed by the IED.

13. The method of claim 1, wherein the distributed power management in the electrical network is coordinated with having at least one IED in the electrical power network with message communication between the plural IEDs in the electrical power network.

14. A system for distributed power management in an electrical power network divided into one or more sections and having plural intelligent electronic devices (IEDs) communicatively connected in a communication network configured for a power management function in the one or more sections of the electrical power network, the system comprising:

a plurality of identified IEDs for one or more sections in the electrical power network to issue a load shed command in their respective sections in coordination with each other, by communicating with each IED within a respective section, data including at least power balance calculation values and an accumulated load value, wherein the coordination is established with a programmed time delay in each of the identified IEDs based on the accumulated load value as compared with a priority set for an electrical circuit associated with a respective identified IED.

15. An IED for distributed power management in an electrical power network, the IED comprising:

means for communicating with other IEDs, the communication including at least updating each other IED with data including at least power balance calculation values and an accumulated load value; and

means for issuing a load shed command at a programmed time delay based on at least the accumulated load value as compared with a priority set for an electrical circuit associated with the IED.