Maximizing of energy delivery system compatibility with voltage optimization using AMI-based data control and analysis

• US 9,582,020 B2
• Filed: 02/28/2014
• Issued: 02/28/2017
• Est. Priority Date: 03/15/2013
• Status: Active Grant

• Current Assignee: Dominion Energy, Inc.
• Original Assignee: Dominion Resources Incorporated
• Inventors: Powell, Phillip W., Tyler, Stephen J., Peskin, Melissa A.
• Primary Examiner(s): WANG, RONGFA PHILIP
• Application Number:
  US14/193,552
• Publication Number:
  US 20140277813A1
• Time in Patent Office: 1,096 Days
• US Class Current: 1/1
• CPC Class Codes: G05B 15/02 electric
• CPC Class Codes: G05F 1/66 Regulating electric power
• 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 13/00007 using the power network as support for the transmission
• CPC Class Codes: H02J 13/00017 using optical fiber
• CPC Class Codes: H02J 13/00034 the elements or equipment being or involving an electric power substation
• CPC Class Codes: H02J 3/1821 using shunt compensators H02J3/1807, H02J3/1878 take precedence
• CPC Class Codes: H02J 3/46 Controlling of the sharing of output between the generators, converters, or transformers
• CPC Class Codes: Y02B 90/20 Smart grids as enabling technology in buildings sector smart grids supporting the management or operation of end-user stationary applications in general, or like technologies with no associated climate change mitigation effect Y04S20/00
• CPC Class Codes: Y02E 40/30 Reactive power compensation
• 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 10/22 Flexible AC transmission systems [FACTS] or power factor or reactive power compensating or correcting units
• CPC Class Codes: Y04S 10/50 Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
• CPC Class Codes: Y04S 40/12 characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
• CPC Class Codes: Y04S 40/121 using the power network as support for the transmission
• CPC Class Codes: Y04S 40/124 using wired telecommunication networks or data transmission busses

Abstract

A method, apparatus, system and computer program is provided for controlling an electric power system, including implementation of a voltage control and conservation (VCC) system used to optimally control the independent voltage and capacitor banks using a linear optimization methodology to minimize the losses in the EEDCS and the EUS. An energy validation process system (EVP) is provided which is used to document the savings of the VCC and an EPP is used to optimize improvements to the EEDCS for continuously improving the energy losses in the EEDS. The EVP system measures the improvement in the EEDS a result of operating the VCC system in the “ON” state determining the level of energy conservation achieved by the VCC system. In addition the VCC system monitors pattern recognition events and compares them to the report-by-exception data to detect HVL events. If one is detected the VCC optimizes the capacity of the EEDS to respond to the HVL events by centering the piecewise linear solution maximizing the ability of the EDDS to absorb the HVL event.

Claims

1. A control system for an electric power transmission and distribution grid configured to supply electric power from a supply point to a plurality of user locations, the system comprising:

a plurality of sensors, wherein each sensor is located at a respective one of a plurality of distribution locations on the distribution grid at or between the supply point and at least one of the plurality of user locations, and wherein each sensor is configured to sense a component of the supplied electric power at the respective distribution location and to generate measurement data based on the sensed component of the power;

a controller configured to generate an energy delivery parameter based on a comparison of the measurement data received from the sensors to a controller target band;

a component adjusting device configured to adjust a component of the electric power transmission and distribution grid in response to the energy delivery parameter;

wherein the controller target band has first upper and lower limits for a first control mode and has second upper and lower limits for a second control mode; and

wherein the controller selects either the first or second modes based on the measurement data received from the sensors, wherein the second control mode is high variation loading (HVL), the controller target band first upper and lower limits define a first range, the controller target band second upper and lower limits define a second range, and the first and second ranges are different.

2. The system of claim 1, wherein the component of the supplied electric power is voltage and the controller target band is a controller target voltage band.

3. The system of claim 2, wherein the first control mode is conservation voltage reduction and the controller target band first upper and lower limits define a lower portion of a first range of acceptable voltage at distribution locations.

4. The system of claim 3, wherein the controller target band second upper and lower limits define a second range of acceptable voltage at distribution locations.

5. The system of claim 4, wherein the controller selects either the first or second modes based on a determination of the system energy state using a measurement of source energy and measurement data received from the sensors.

6. The system of claim 4, wherein the controller is further configured modify the first and second upper and lower limits based on a comparison of the measurement data received from the sensors to the controller target band.

7. The system of claim 6, wherein the controller is adapted to determine the second upper and lower limits for the second control mode to select the amount of high variation load and generation using voltage, current, power magnitudes and power angles using a linearization technique.

8. The system of claim 2, wherein the voltage component of the supplied electric power includes the voltage magnitude and the voltage angle.

9. The system of claim 1, wherein the controller is further configured to receive measurement data from each sensor of a subset of the plurality of sensors, wherein the subset includes more than one and substantially fewer than all of the plurality of sensors, and to generate the energy delivery parameter based on a comparison of the measurement data received from the subset to the controller target band.

10. The system of claim 9, wherein the subset is chosen based on a characteristic of the sensor.

11. The system of claim 10, wherein the characteristic is that the sensors are within a specific block of the distribution grid.

12. The system of claim 10, wherein the characteristic is that the sensors are within a specific zone of the distribution grid.

13. The system of claim 9, wherein the controller is further configured to add to the subset the at least one other sensor in response to receiving the signal indicating that the measured component of electric power sensed by the at least one other sensor is outside of the controller target band and to de-select at least one of the sensors in the subset when adding the at least one other sensor to the subset.

14. The system of claim 9, wherein the controller is further configured to add to the subset the at least one other sensor in response to receiving the signal indicating that the measured component of electric power sensed by the at least one other sensor is below the controller target band and to de-select at least one of the sensors in the subset when adding the at least one other sensor to the subset.

15. The system of claim 9, wherein the controller is further configured to add to the subset the at least one other sensor in response to receiving the signal indicating that the measured component of electric power sensed by the at least one other sensor is above the controller target band and to de-select at least one of the sensors in the subset when adding the at least one other sensor to the subset.

16. The system of claim 9, wherein the voltage controller is further configured to adjust the energy delivery parameter when one of the voltage at a user location or the determined average voltage is below a predetermined minimum voltage value, the predetermined minimum voltage value being based on the safe nominal operating range.

17. The system of claim 9, wherein the subset corresponds to a measured component phase and sensors of the subset sensing a component having an incorrect phase are deleted from the subset.

18. The system of claim 17, wherein there are a plurality of subsets of sensors, each corresponding to a phase of the component of electric power, and the sensors deleted from the a subset due to incorrect phase are added to the subset having the correct corresponding phase.

19. The system of claim 9, wherein the subset for the first mode is different from the subset for the second mode.

20. The system of claim 9, wherein the subset in the second control mode comprises the sensors sensing the highest component of the supplied electric power.

21. The system of claim 9, wherein the subset in the second control mode comprises the sensors sensing the lowest component of the supplied electric power.

22. The system of claim 9, further comprising a plurality of subsets, wherein each subset corresponds to a specific block of the distribution grid and wherein at least one subset in the second control mode comprises the sensors sensing the highest component of the supplied electric power.

23. The system of claim 9, further comprising a plurality of subsets, wherein each subset corresponds to a specific block of the distribution grid and wherein at least one subset in the second control mode comprises the sensors sensing the lowest component of the supplied electric power.

24. The system of claim 1, wherein the component of the supplied electric power is at least one of phase angle, current angle, power factor, VAR and power vectors.

25. The system of claim 1, wherein the component adjusting device is configured to vary at least one of a phase angle, a current angle, a power factor, a VAR and a power vector.

26. The system of claim 1, wherein the component of the supplied electric power is a complex voltage.

27. The system of claim 1, wherein the controller is further configured to determine a complex voltage based on measurement data from the plurality of sensors.

28. A method for controlling electric power supplied to a plurality of distribution locations located at or between a supply point and at least one user location, each of the plurality of distribution locations including at least one sensor configured to sense a component of the supplied electric power at the respective distribution location and generate measurement data based on the sensed component, the method comprising:

generating an energy delivery parameter based on a comparison of the measurement data received from the sensors to a controller target band, the controller target band having first upper and lower limits for a first control mode and having second upper and lower limits for a second control mode;

operating a component adjusting device configured to adjust a component of the electric power transmission and distribution grid in response to the energy delivery parameter; and

selecting either the first or second modes based on the measurement data received from the sensors,

wherein the second control mode is high variation loading (HVL), the controller target band first upper and lower limits define a first range, the controller target band second upper and lower limits define a second range, and the first and second ranges are different.

29. The method of claim 28, wherein the component of the supplied electric power is voltage and the controller target band is a controller target voltage band.

30. The system of claim 29, wherein the first control mode is conservation voltage reduction and the controller target band first upper and lower limits define a lower portion of a first range of acceptable voltage at distribution locations.

31. The method of claim 30, wherein the controller target band second upper and lower limits define a second range of acceptable voltage at distribution locations.

32. The system of claim 31, wherein the controller selects either the first or second modes based on a determination of the system energy state using a measurement of source energy and measurement data received from the sensors.

33. The system of claim 29, wherein the voltage component of the supplied electric power includes the voltage magnitude and the voltage angle.