Granted Patent B2

US 12,254,023 · App. 18/125,815 · Granted Mar 18, 2025

Inventors: Hadi Khani (Richmond Hill, CA); David G. Hart (Raleigh, NC)

Assignee: Quanta Technology, LLC

G06F16/258G06F16/215

Abstract

Claims (72)

1. A method for power system model conversion and quality verification, the method comprising:

obtaining a phasor-domain model of a power system;

obtaining a raw file that represents a representable subset of parameters of the phasor-domain model as parameters of a bus-branch model;

modifying values of the parameters of the bus-branch model in the raw file as needed for the raw file as modified to represent the representable subset of parameters of the phasor-domain model with at least a minimum level of accuracy;

generating, from the phasor-domain model, a supplementary file that represents a non-representable subset of parameters of the phasor-domain model which is not representable by the raw file;

obtaining a time-domain specific parameter file that represents parameters specific for modeling the power system in a time-domain;

converting the phasor-domain model of the power system to a time-domain model of the power system, based on the raw file as modified, the supplementary file, and the time-domain specific parameter file; and

performing fault simulation-based quality verification of the time-domain model by:

comparing results of fault simulation in the power system as modeled with the phasor-domain model and results of fault simulation in the power system as modeled with the time-domain model; and

based on said comparing, modifying the time-domain model as needed to reduce discrepancy between the results of fault simulation in the power system as modeled with the phasor-domain model and results of fault simulation in the power system as modeled with the time-domain model.

2. The method of claim 1 , wherein said modifying comprises, for each of one or more iterations:

extracting, from the phasor-domain model, values of at least some parameters in the representable subset;

performing a comparison of the extracted values with values of respective parameters in the bus-branch model in the raw file; and

modifying one or more values of the respective parameters in the bus-branch model in the raw file, as needed to reduce any discrepancy with the extracted parameters according to the comparison.

3. The method of claim 2 , wherein said extracting and/or said modifying is performed by running rule-based Structured Query Language (SQL) queries on the phasor-domain model.

4. The method of claim 1 , wherein performing fault simulation-based quality verification of the time-domain model comprises:

performing one or more phasor-domain simulations of faults in the power system as modeled with the phasor-domain model and obtaining phasor-domain results of the one or more phasor-domain simulations;

performing one or more time-domain simulations of faults in the power system as modeled with the time-domain model and obtaining time-domain results of the one or more time-domain simulations;

converting the time-domain results into the phasor-domain, or converting the phasor-domain results into the time-domain, to obtain results of the one or more phasor-domain simulations and results of the one or more time-domain simulations in a common domain; and

comparing results of the one or more phasor-domain simulations and results of the one or more time-domain simulations in the common domain.

5. The method of claim 1 , wherein performing the fault simulation-based quality verification of the time-domain model comprises performing the fault simulation-based quality verification of the time-domain model in each of multiple iterations, modifying the time-domain model in between the iterations as needed to reduce discrepancy between the results of fault simulation in the power system as modeled with the phasor-domain model and results of fault simulation in the power system as modeled with the time-domain model.

6. The method of claim 1 , further comprising performing data-based quality verification of the time-domain model by:

extracting data of the same type from each of the time-domain model and the phasor-domain model; and

comparing the data extracted from the time-domain model to the data extracted from the phasor-domain model.

7. The method of claim 6 , wherein the extracted data includes one or more of:

line parameters including zero, positive, and/or negative sequence values;

generator parameters including zero, positive, and/or negative sequence values, ratings, and/or voltage levels; or

shunt equipment parameters including zero, positive, and/or negative sequence values.

8. The method of claim 6 , wherein performing the data-based quality verification of the time-domain model comprises performing the data-based quality verification of the time-domain model in each of multiple iterations, modifying the time-domain model in between the iterations as needed to reduce discrepancy between the data extracted from the time-domain model and the data extracted from the phasor-domain model.

9. The method of claim 1 , wherein the parameters of the bus-branch model include a bus voltage parameter indicating voltage levels of respective buses in the bus-branch model, wherein parameters specific for modeling the power system in a time-domain include transformer saturation parameters, transient parameters, and/or frequency-dependent line parameters, and wherein the non-representable subset of parameters includes a mutual coupling parameter.

10. The method of claim 1 , further comprising analyzing the power system, accounting for electromagnetic transients, using the time-domain model.

11. A non-transitory computer-readable medium on which is stored a computer program that, when executed by processing circuitry of a computer, causes the computer to:

obtain a phasor-domain model of a power system;

obtain a raw file that represents a representable subset of parameters of the phasor-domain model as parameters of a bus-branch model;

modify values of the parameters of the bus-branch model in the raw file as needed for the raw file as modified to represent the representable subset of parameters of the phasor-domain model with at least a minimum level of accuracy;

generate, from the phasor-domain model, a supplementary file that represents a non-representable subset of parameters of the phasor-domain model which is not representable by the raw file;

obtain a time-domain specific parameter file that represents parameters specific for modeling the power system in a time-domain;

convert the phasor-domain model of the power system to a time-domain model of the power system, based on the raw file as modified, the supplementary file, and the time-domain specific parameter file; and

perform fault simulation-based quality verification of the time-domain model by:

comparing results of fault simulation in the power system as modeled with the phasor-domain model and results of fault simulation in the power system as modeled with the time-domain model; and

modifying the time-domain model as needed to reduce discrepancy between the results of fault simulation in the power system as modeled with the phasor-domain model and results of fault simulation in the power system as modeled with the time-domain model.

12. The non-transitory computer-readable medium of claim 11 , wherein the computer program, when executed by the processing circuitry of the computer, causes the computer to modify values of the parameters of the bus-branch model in the raw file by, for each of one or more iterations:

extracting, from the phasor-domain model, values of at least some parameters in the representable subset;

performing a comparison of the extracted values with values of respective parameters in the bus-branch model in the raw file; and

modifying one or more values of the respective parameters in the bus-branch model in the raw file, as needed to reduce any discrepancy with the extracted parameters according to the comparison.

13. The non-transitory computer-readable medium of claim 12 , wherein the computer program, when executed by the processing circuitry of the computer, causes the computer to perform said extracting and/or said modifying by running rule-based Structured Query Language (SQL) queries on the phasor-domain model.

14. The non-transitory computer-readable medium of claim 11 , wherein the computer program, when executed by the processing circuitry of the computer, causes the computer to perform fault simulation-based quality verification of the time-domain model by:

performing one or more phasor-domain simulations of faults in the power system as modeled with the phasor-domain model and obtaining phasor-domain results of the one or more phasor-domain simulations;

performing one or more time-domain simulations of faults in the power system as modeled with the time-domain model and obtaining time-domain results of the one or more time-domain simulations;

converting the time-domain results into the phasor-domain, or converting the phasor-domain results into the time-domain, to obtain results of the one or more phasor-domain simulations and results of the one or more time-domain simulations in a common domain; and

comparing results of the one or more phasor-domain simulations and results of the one or more time-domain simulations in the common domain.

15. The non-transitory computer-readable medium of claim 11 , wherein the computer program, when executed by the processing circuitry of the computer, causes the computer to perform the fault simulation-based quality verification of the time-domain model by performing the fault simulation-based quality verification of the time-domain model in each of multiple iterations, modifying the time-domain model in between the iterations as needed to reduce discrepancy between the results of fault simulation in the power system as modeled with the phasor-domain model and results of fault simulation in the power system as modeled with the time-domain model.

16. The non-transitory computer-readable medium of claim 11 , wherein the computer program, when executed by the processing circuitry of the computer, further causes the computer to perform data-based quality verification of the time-domain model by:

extracting data of the same type from each of the time-domain model and the phasor-domain model; and

comparing the data extracted from the time-domain model to the data extracted from the phasor-domain model.

17. The non-transitory computer-readable medium of claim 16 , wherein the extracted data includes one or more of:

line parameters including zero, positive, and/or negative sequence values;

generator parameters including zero, positive, and/or negative sequence values, ratings, and/or voltage levels; or

shunt equipment parameters including zero, positive, and/or negative sequence values.

18. The non-transitory computer-readable medium of claim 16 , wherein the computer program, when executed by the processing circuitry of the computer, causes the computer to perform the data-based quality verification of the time-domain model by performing the data-based quality verification of the time-domain model in each of multiple iterations, modifying the time-domain model in between the iterations as needed to reduce discrepancy between the data extracted from the time-domain model and the data extracted from the phasor-domain model.

19. The non-transitory computer-readable medium of claim 11 , wherein the parameters of the bus-branch model include a bus voltage parameter indicating voltage levels of respective buses in the bus-branch model, wherein parameters specific for modeling the power system in a time-domain include transformer saturation parameters, transient parameters, and/or frequency-dependent line parameters, and wherein the non-representable subset of parameters includes a mutual coupling parameter.

20. Conversion equipment comprising processing circuitry configured to:

obtain a phasor-domain model of a power system;

obtain a raw file that represents a representable subset of parameters of the phasor-domain model as parameters of a bus-branch model;

modify values of the parameters of the bus-branch model in the raw file as needed for the raw file as modified to represent the representable subset of parameters of the phasor-domain model with at least a minimum level of accuracy;

generate, from the phasor-domain model, a supplementary file that represents a non-representable subset of parameters of the phasor-domain model which is not representable by the raw file;

obtain a time-domain specific parameter file that represents parameters specific for modeling the power system in a time-domain;

convert the phasor-domain model of the power system to a time-domain model of the power system, based on the raw file as modified, the supplementary file, and the time-domain specific parameter file; and

perform fault simulation-based quality verification of the time-domain model by:

comparing results of fault simulation in the power system as modeled with the phasor-domain model and results of fault simulation in the power system as modeled with the time-domain model; and

modifying the time-domain model as needed to reduce discrepancy between the results of fault simulation in the power system as modeled with the phasor-domain model and results of fault simulation in the power system as modeled with the time-domain model.

21. The non-transitory computer-readable medium of claim 11 , wherein the computer program, when executed by processing circuitry of a computer, further causes the computer to analyze the power system, accounting for electromagnetic transients, using the time-domain model.

Assignments (1)

Continuity (1)

References Cited (10)