Inertia compensated load tracking in electrical power systems

• US 10,135,250 B2
• Filed: 05/25/2016
• Issued: 11/20/2018
• Est. Priority Date: 05/25/2016
• Status: Active Grant

• Current Assignee: Schweitzer Engineering Laboratories, Incorporated
• Original Assignee: Schweitzer Engineering Laboratories, Incorporated
• Inventors: Manson, Scott M.
• Primary Examiner(s): Borroto, Alfonso Perez
• Assistant Examiner(s): Yeshaw, Esayas
• Application Number:
  US15/164,602
• Publication Number:
  US 20170346290A1
• Time in Patent Office: 909 Days
• CPC Class Codes: H02J 13/00006 characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
• CPC Class Codes: H02J 3/381 Dispersed generators
• CPC Class Codes: H02J 3/466 Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
• CPC Class Codes: Y02E 40/70 Smart grids as climate change mitigation technology in the energy generation sector
• CPC Class Codes: Y02E 60/00 Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
• CPC Class Codes: Y04S 10/12 Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation
• CPC Class Codes: Y04S 10/18 using switches, relays or circuit breakers, e.g. intelligent electronic devices [IED]

Abstract

The present disclosure relates to systems and methods for balancing electrical generation and electrical demand in an electrical power system. In various embodiments, a controller may receive priority designations associated with a plurality of loads and inertia of a plurality of electrical generators. A trigger event analysis subsystem may detect a trigger event based on electrical conditions at a plurality of nodes within the electrical power system. A topology detection subsystem may identify a first subset of the plurality of nodes at which electrical conditions reflect the first trigger event and may associate those nodes in an electrical island. An electrical balancing system and control system may be configured to determine and eliminate an imbalance between electrical generation and electrical demand based on the combined inertia of the subset of the plurality of electrical generators and the plurality of priority designations associated with the subset of the plurality of loads.

Claims

1. A controller configured to balance electrical generation and electrical demand in an electrical power system, the controller comprising:

a user parameters subsystem configured to receive;

a plurality of priority designations associated with a plurality of loads; and

an inertia of a plurality of electrical generators;

a trigger event analysis subsystem configured to detect a first trigger event based on electrical conditions at a plurality of nodes within the electrical power system, each node comprising an electrical generator;

a topology detection subsystem configured to;

identify a first subset of the plurality of nodes at which electrical conditions reflect the first trigger event;

associate in an electrical island a subset of the plurality of electrical generators and a subset of the plurality of loads based on the first subset of the plurality of nodes at which the operating conditions reflect the first trigger event;

an electrical balancing subsystem configured to determine an imbalance between electrical generation and electrical demand in the first island based on a combined inertia of the subset of the plurality of electrical generators and the electrical demand of the subset of the plurality of loads;

a control action subsystem configured to generate a control action operable to eliminate the imbalance between electrical generation and electrical demand based on the combined inertia of the subset of the plurality of electrical generators and the plurality of priority designations associated with the subset of the plurality of loads.

2. The controller of claim 1, wherein the trigger event comprises a deviation from an operating frequency of the electrical power system.

3. The controller of claim 2, wherein the deviation from the operating frequency comprises one of an under frequency event and an over frequency event.

4. The controller of claim 1, wherein the trigger event comprises a deviation from a phase angle.

5. The controller of claim 1, wherein the trigger event analysis subsystem is further configured to determine that the first trigger event exceeds a predetermined threshold.

6. The controller of claim 1, wherein the trigger detection system is further configured to detect a second trigger event, and wherein the topology detection subsystem is further configured to identify a second subset of the plurality of nodes at which electrical conditions reflect the second trigger event and to associate in the electrical island the nodes in the first subset and the second subset.

7. The controller of claim 1, further comprising a communication subsystem configured to exchange with a plurality of other controllers the priority designation associated with the plurality of loads and the inertia of the plurality of electrical generators.

8. The controller of claim 1, wherein the trigger event analysis subsystem is further configured to receive representations of electrical conditions at the plurality of nodes from a plurality of associated intelligent electronic devices (IEDs).

9. The controller of claim 1, further comprising a power flow prediction subsystem configured to analyze an impact of the control action on a power corridor;

wherein, the control action subsystem is further configured to adjust the control action based on the impact of the control action on the power corridor.

10. The controller of claim 1, wherein the trigger event analysis subsystem is further configured to associate a time with the first trigger event, and the topology detection subsystem is further configured to associate in the electrical island each node at which the operation conditions reflect the first trigger event at the time.

11. The controller of claim 1, further comprising a power consumption subsystem configured to determine an electrical demand of the subset of the plurality of loads associated in the electrical island, and wherein the power consumption is provided to the electrical balancing subsystem.

12. A method for balancing electrical generation and electrical demand in an electrical power system, the method comprising:

receiving a plurality of priority designations associated with a plurality of loads and an inertia of a plurality of electrical generators;

detecting a first trigger event based on electrical conditions at a plurality of nodes within the electrical power system, each node comprising an electrical generator;

identifying a topology of the electrical power system by identifying a subset of the plurality of nodes at which electrical conditions reflect the first trigger event and associating in an electrical island a subset of the plurality of electrical generators and a subset of the plurality of loads based on the subset of the plurality of nodes at which the operating conditions reflect the first trigger event;

determining an imbalance between electrical generation and electrical demand in the first island based on a combined inertia of the subset of the plurality of electrical generators and the electrical demand of the subset of the plurality of loads;

generating a control action operable to eliminate the imbalance between electrical generation and electrical demand based on the combined inertia of the subset of the plurality of electrical generators and the plurality of priority designations associated with the subset of the plurality of loads.

13. The method of claim 12, wherein the trigger event comprises a deviation from an operating frequency of the electrical power system.

14. The method of claim 12, wherein the trigger event comprises a deviation from a phase angle.

15. The method of claim 12, further comprising:

detecting a second trigger event;

identifying a second subset of the plurality of nodes at which electrical conditions reflect the second trigger event; and

associating in the electrical island the nodes in the first subset and the second subset.

16. The method of claim 12, further comprising:

exchanging the priority designation associated with the plurality of loads and the inertia of the plurality of electrical generators with a plurality of other controllers.

17. The method of claim 12, further comprising:

receiving representations of electrical conditions at the plurality of nodes from a plurality of associated intelligent electronic devices (IEDs).

18. The method of claim 12, further comprising:

analyzing an impact of the control action on a power corridor; and

adjusting the control action based on the impact of the control action on the power corridor.

19. The method of claim 12, further comprising:

associating a time with the first trigger event,

associating in the electrical island each node at which the operation conditions reflect the first trigger event at the time.

20. The method of claim 12, further comprising determining an electrical demand of the subset of the plurality of loads associated in the electrical island, and wherein the power consumption is provided to the electrical balancing subsystem.