Pre-Processing of Data For Automatic Generation Control

• US 20130325195A1
• Filed: 06/05/2012
• Published: 12/05/2013
• Est. Priority Date: 06/05/2012
• Status: Active Grant

• Current Assignee: Alstom Technology Ltd. (Alstom SA)
• Original Assignee: Alstom Grid Incorporated (Alstom SA)
• Inventors: Patterson, Anthony Terence, Nelson, Bradley Thomas
• Granted Patent: US 9,160,171 B2
• Time in Patent Office: Days
• US Class Current: 700/286
• CPC Class Codes: G05B 15/02 electric
• CPC Class Codes: H02J 2203/20 Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
• CPC Class Codes: H02J 3/00 Circuit arrangements for ac mains or ac distribution networks
• CPC Class Codes: H02J 3/38 Arrangements for parallely feeding a single network by two or more generators, converters or transformers
• CPC Class Codes: Y02E 60/00 Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
• CPC Class Codes: Y04S 40/20 Information technology specific aspects, e.g. CAD, simulation, modelling, system security

Abstract

Systems, methods, and apparatus for pre-processing of electrical power grid data for event-driven automatic generation control (AGC) are presented herein. An AGC application can determine AGC output data, for output to a unit controller that controls power generator(s) related to an electrical power grid, based on current values of a subset of electrical power grid data associated with the electrical power grid that has changed since a prior determination that the electrical power grid data has changed. A pre-process component can determine the subset of the electrical power grid data that has changed since the prior determination, and send the current values of the subset of the electrical power grid data to an area control error component. An event-driven component can determine information in response to an event trigger generated based on processing the current values of the subset of the electrical power grid data received from the pre-process component.

Claims

1. A system, comprising:

a memory storing computer-executable components; and

a processor, communicatively coupled to the memory, that facilitates execution of the computer-executable components, comprising;

a pre-process component configured to determine a subset of electrical power grid data associated with an electrical power grid that has changed since a prior determination that at least some of the electrical power grid data has changed; and

an automatic generation control (AGC) application configured to receive current values of the subset of the electrical power grid data from the pre-process component and determine AGC output data based on the current values of the subset of the electrical power grid data.

2. The system of claim 1, wherein the pre-process component is further configured to determine the subset of the electrical power grid data that has changed based on a predetermined precision level with respect to whether a given change for a respective electrical power grid data point constitutes a significant change that is included in the subset or constitutes an insignificant change that is not included in the subset.

3. The system of claim 2, wherein the pre-process component is further configured to determine whether the given change for the respective electrical power grid data point constitutes the significant change or the insignificant change based on an analysis of a predefined number of significant digits for the given change.

4. The system of claim 1, wherein the electrical power grid data indicates at least one of a power flow of a tie line of the electrical power grid, a frequency of the electrical power grid, an output associated with a power source of the electrical power grid, or an output associated with a virtual power plant of the electrical power grid.

5. The system of claim 1, wherein the electrical power grid data indicates at least one of a schedule of tie line power associated with a tie line of the electrical power grid or a schedule of generated power associated with a power source of the electrical power grid.

6. The system of claim 1, wherein the AGC application is further configured to:

in response to identifying a dependency between a set of calculations to be performed by the AGC application based on at least part of the subset of the electrical power grid data and a dependent set of calculations previously performed by the AGC application, performing the set of calculations to determine current values and updating a result computed by the AGC application based on the current values of the set of calculations and values pre-computed for the previously performed set of calculations.

7. The system of claim 1, wherein the AGC application is further configured to:

determine a summation of power flows of a group of tie lines of the electrical power grid based on the subset of electrical power grid including a changed value with respect to power flow of a tie line of the group of tie lines; and

based on a dependency of the changed value to previously computed values of the summation, re-compute the summation of power flows for the group based on the changed value and the previously computed values.

8. The system of claim 1, wherein the pre-process component is further configured to, in response receiving a change of an electrical power grid data point of a set of related electrical power grid data points, delay sending the subset of the electrical power grid data to the AGC application for a predetermined period of time to enable a set of changes related to the set of the related electrical power grid data points to be identified by the pre-process component and included in the subset that is sent to the AGC application.

9. The system of claim 1, wherein the AGC component is further configured to delay performing a set of computations based on the subset of the electrical power grid data for a predetermined period of time to enable a set of changes of the electrical power grid data related to the set of computations to be received by the AGC application.

10. The system of claim 1, wherein the pre-process component is further configured to delay a calculation of at least part of the subset of the electrical power grid data for a predetermined period of time based on a probability that a batch of changes, which are dependent on at least one of the current values of the subset of the electrical power grid data, will be received within the predetermined period of time.

11. The system of claim 10, wherein the pre-process component is further configured to delay a summation of values of the electrical power grid data, the summation including at least one of the current values of the subset of the electrical power grid data being summed.

12. The system of claim 10, wherein the computer-executable components further comprise an analytic component configured to modify the predetermined period of time to delay the calculation of at least the part of the subset of the electrical power grid data based on an analysis of historical change data associated with the electrical power grid data.

13. The system of claim 1, further comprising:

an event-driven component configured to determine information in response to an event trigger generated as a result of processing the current values of the subset of the electrical power grid data received from the pre-process component.

14. The system of claim 1, further comprising:

a North American electric reliability corporation (NERC) component configured to periodically determine NERC information utilizing the current values of the subset of the electrical power grid data.

15. The system of claim 1, further comprising:

a reserve component configured to calculate current available reserve data and compare to a reserve requirement in response to an event trigger generated as a result of processing the current values of the subset of the electrical power grid data.

16. The system of claim 1, further comprising:

an economic dispatch (ED) component configured to generate unit control information in response to an event trigger generated as a result of processing the current values of the subset of the electrical power grid data or during a periodic ED processing cycle.

17. The system of claim 1, wherein the electrical power grid data includes supervisory control and data acquisition (SCADA) data associated with the electrical power grid.

18. A method, comprising:

determining, by an energy management system (EMS) including at least one processor, a subset of electrical power grid data associated with an electrical power grid that has changed since a prior determination at least some of the electrical power grid data has changed; and

based on changed values represented in the subset of the electrical power grid data, determining automatic generation control (AGC) data based on the subset of the electrical power grid data.

19. The method of claim 18, wherein the determining the subset of the electrical power grid data that has changed further includes:

determining, based on respective predetermined precision levels applied for respective values of the electrical power grid data, whether a given data point of the electrical power grid data has changed in response to polling a current value of the given data point.

20. The method of claim 18, wherein the determining the subset of the electrical power grid data that has changed further includes:

determining, based on respective predetermined precision levels applied for respective values of the electrical power grid data, whether a given data point of the electrical power grid data has changed in response to an event that indicates a change in value of the given data point.

21. The method of claim 18, wherein the determining the subset of the electrical power grid data that has changed further includes:

determining, based on respective predetermined precision levels applied for respective values of the electrical power grid data, that a given data point of the electrical power grid data has changed in response to a new value received for the given data point replacing a previous value.

22. The method of claim 21, wherein the determining that the given data point of the electrical power grid data has changed further includes:

in response to identifying a dependency between a set of calculations to be performed based on at least some of the subset of the electrical power grid data and a dependent set of calculations previously performed by the EMS, performing the set of calculations to determine current values of the set of calculations and update a result computed by the EMS based on the current values of the set of calculations and the previously performed, dependent set of calculations.

23. The method of claim 18, wherein the processing further includes:

in response to receiving a change to a data point of a batch of related electrical power grid data points, delaying calculations related to the subset of electrical power grid data for a predetermined period of time to accommodate receipt of a changed data point to the batch of related electrical power grid data points.

24. A computer-readable storage medium comprising instructions that, in response to execution, cause a system including at least one processor to perform operations, comprising:

receiving a subset of changed values of electrical power grid data associated with an electrical power grid determined to have changed relative to previous values of the electrical power grid data; and

based on the receiving the subset of the changed values, determining automatic generation control (AGC) data based on a subset of the electrical power grid data.

25. The computer-readable storage medium of claim 24, wherein the determining the AGC data further includes:

in response to identifying a dependency of a first computation associated with a changed value of the changed values on a second computation that preceded the first computation, computing a result that is affected by the dependency based on the first computation and previously computed values of the second computation.

26. The computer-readable storage medium of claim 24, wherein the operations further comprise in response to an event trigger generated as a result of processing the subset of the changed values or during a periodic ED processing cycle, at least one of:

determining North American electric reliability corporation (NERC) information utilizing the subset of the changed values;

generating current available reserve information and comparing the current available reserve information to a reserve requirement;

or

generating economic dispatch (ED) information based on the subset of the changed values.

27. The computer-readable storage medium of claim 24, wherein the operations further comprise:

delaying calculations associated with at least a portion of the electrical power grid data for a predetermined period of time in response to receiving a changed value of a data point of a batch of related electrical power grid data points.