Monitoring operating conditions of a transformer during major electromagnetic disturbances

• US 10,451,660 B2
• Filed: 06/30/2015
• Issued: 10/22/2019
• Est. Priority Date: 06/30/2015
• Status: Active Grant

• Current Assignee: Utopus Insights, Inc. (Vestas Wind Systems A/S)
• Original Assignee: Utopus Insights, Inc. (Vestas Wind Systems A/S)
• Inventors: Basu, Chumki, Padmanaban, Manikandan
• Primary Examiner(s): Gauthier, Steven B
• Application Number:
  US14/755,562
• Publication Number:
  US 20170003329A1
• Time in Patent Office: 1,575 Days
• CPC Class Codes: G01R 19/28 adapted for measuring in circuits having distributed constants
• CPC Class Codes: G01R 21/1331 Measuring real or reactive component, measuring apparent energy
• CPC Class Codes: G01R 31/62 Testing of transformers

Abstract

Methods and arrangements for computing disruptive current in a transformer. Transformer current is measured, and disruptive current is predicted. Based on the active transformer current and predicted disruptive current, a predicted reactive power and predicted neutral current are determined. At least one corrective action, to be taken with respect to the transformer, is thereupon identified. Other variants and embodiments are broadly contemplated herein.

Claims

1. A method of managing disruptive current to be caused by geomagnetic activity of a transformer in a power system, the method comprising:

measuring, by at least one processor, present active current of the transformer;

predicting, by at least one processor, a transformer current of the transformer based on a forecast of geomagnetic activity;

extracting a first even-order higher frequency component of the measured present active current using a fast Fourier transform analyzer and using a phasor measurement unit;

predicting, by the at least one processor, a second even-order higher frequency component of the predicted transformer current attributable to a potential disruptive current to be caused by the transformer;

determining, by the at least one processor, based on the first even-order frequency component of the present active current and the second even-order frequency component of the predicted transformer current attributable to the predicted potential disruptive current, a predicted reactive power consumption of the transformer during the geomagnetic activity and a predicted neutral current of the transformer during the geomagnetic activity;

identifying, by the at least one processor, at least one corrective action to be proactively taken with respect to the transformer to address the geomagnetic activity, based on the predicted reactive power consumption and the predicted neutral current, the at least one corrective action including reducing load conditions of the power system; and

causing, by the at least one processor, to reduce load conditions of the power system, thereby mitigating or reducing the impact of the geomagnetic activities on the power system.

2. The method according to claim 1, wherein the determining comprises determining, by the at least one processor, based on the first even-order frequency component of the present active current and the second even-order frequency component of the predicted transformer current attributable to the predicted potential disruptive current, estimated active parameters of the transformer.

3. The method according to claim 2, wherein the estimated active parameters include operating conditions, the predicted reactive power consumption and the predicted neutral current.

4. The method according to claim 3, wherein the operating conditions include transformer flux.

5. The method according to claim 1, wherein the disruptive current comprises a current induced by an electromagnetic disturbance.

6. The method according to claim 1, wherein the disruptive current comprises a geomagnetically-induced current.

7. The method according to claim 1, wherein the determining comprises modeling a saturation angle of the transformer.

8. The method according to claim 7, wherein:

the determining of the predicted neutral current comprises modeling neutral current of the transformer; and

the modeling of neutral current comprises incorporating the modeled saturation angle.

9. The method according to claim 8, wherein the modeling of neutral current comprises deriving a relationship between current flows induced in the transformer by the disruptive current and the modeled saturation angle.

10. The method according to claim 7, wherein:

the determining of the predicted reactive power consumption comprises modeling reactive power consumption of the transformer; and

the modeling of reactive power consumption comprises incorporating the modeled saturation angle.

11. The method according to claim 10, wherein the modeling of reactive power consumption comprises deriving a relationship between reactive power consumed during a disruptive current and the modeled saturation angle.

12. An apparatus for managing disruptive current to be caused by geomagnetic activity of a transformer in a power system, the apparatus comprising:

at least one processor; and

a non-transitory computer readable storage medium to store computer readable program code that when executed by the at least one processor causes the apparatus to perform a method, the method comprising;

measuring, by the at least one processor, present active current of the transformer;

predicting, by the at least one processor, transformer current of the transformer based on a forecast of geomagnetic activity;

extracting a first even-order higher frequency component of the measured present active current using a fast Fourier transform analyzer and using a phasor measurement unit;

predicting, by the at least one processor, a second even-order higher frequency components of predicted transformer current attributable to potential disruptive current to be caused by the transformer;

determining, by the at least one processor, based on the first even-order frequency component of the present active current and the second even-order frequency component of the predicted transformer current attributable to the potential disruptive current, a predicted reactive power consumption of the transformer during the geomagnetic activity and a predicted neutral current of the transformer during the geomagnetic activity;

identifying, by the at least one processor, at least one corrective action to be proactively taken with respect to the transformer to address the geomagnetic activity, based on the predicted reactive power consumption and the predicted neutral current, the at least one corrective action including reducing loading conditions of the power system; and

causing, by the at least one processor, to reduce load conditions of the power system, thereby mitigating or reducing the impact of geomagnetic activities on the power system.

13. A non-transitory computer program product for managing disruptive current to be caused by geomagnetic activity of a transformer in a power system, the non-transitory computer program product comprising:

at least one processor; and

a non-transitory computer readable storage medium to store computer readable program code that, when executed by the at least one processor causes the at least one processor to perform a method, the method comprising;

measuring, by the at least one processor, present active current of the transformer;

predicting, by the at least one processor, transformer current of the transformer based on a forecast of geomagnetic activity;

extracting, a first even-order higher frequency component of the measured present active current using a fast Fourier transform analyzer and using a phasor measurement unit;

predicting, by the at least one processor, a second even-order higher frequency component of the predicted transformer current attributable to potential disruptive current to be caused by the transformer;

determining, by the at least one processor, based on the first even-order frequency component of the present active current and the second even-order frequency component of the predicted transformer current attributable to the predicted potential disruptive current, a predicted reactive power consumption of the transformer during the geomagnetic activity and a predicted neutral current of the transformer during the geomagnetic activity;

identifying, by the at least one processor, at least one corrective action to be proactively taken with respect to the transformer to address the geomagnetic activity, based on the predicted reactive power consumption and the predicted neutral current; and

causing, by the at least one processor, the identified at least one corrective action to be proactively taken with respect to the transformer to address the geomagnetic activity, thereby mitigating or reducing the impact of the geomagnetic activities on a power system.

14. The non-transitory computer program product according to claim 13, comprising the non-transitory computer readable storage medium to store computer readable program code that, when executed by the at least one processor causes the at least one processor to perform a method, the method further comprising:

determining, by the at least one processor, estimated active parameters of the transformer based on the active transformer current and predicted disruptive current.

15. The non-transitory computer program product according to claim 13, wherein the disruptive current comprises a current induced by an electromagnetic disturbance.

16. The non-transitory computer program product according to claim 13, wherein the determining comprises modeling a saturation angle of the transformer.

17. A method comprising:

causing, by at least one processor, present active current in a transformer of a power system to be measured, the measuring comprising determining a first set of even-order higher frequency components of the present active current of the transformer;

predicting, by the at least one processor, potential disruptive current to be caused by the transformer, the predicting comprising predicting a second set of even-order higher frequency components of the predicted transformer current attributable to the predicted potential disruptive current to be caused based on a forecast of geomagnetic activity, wherein the potential disruptive current comprises a geomagnetically-induced current;

determining, by the at least one processor, based on the first set of even-order frequency components of the present active current and the second set of even-order frequency components of the predicted transformer current attributable to the predicted potential disruptive current, estimated active parameters of the transformer, which includes operating conditions, a predicted reactive power consumption of the transformer during the geomagnetic activity, and a predicted neutral current of the transformer during the geomagnetic activity;

identifying, by the at least one processor, at least one corrective action to be proactively taken with respect to the transformer to address the geomagnetic activity, at least based on the predicted reactive power consumption and the predicted neutral current, the at least one corrective action including reducing load conditions of the power system; and

causing, by the at least one processor, to reduce load conditions of the power system, thereby mitigating or reducing the impact of the geomagnetic activities on the power system.