Multi-phase sensing and control using a combination of line post sensors and wireless current sensors

Patent metadata

Field	Value
Publication number	US-11209465-B2
Application number	US-201916580455-A
Country	US
Kind code	B2
Filing date	Sep 24, 2019
Priority date	Sep 24, 2019
Publication date	Dec 28, 2021
Grant date	Dec 28, 2021

Abstract

The present disclosure relates to a capacitor bank control system that uses a combination of line post sensors and wireless current sensors for control operations. For example, a capacitor bank controller may include one or more inputs that electrically couple to a line post sensor to allow the capacitor bank controller to obtain line post sensor measurements. The capacitor bank controller may include a transceiver that receives wireless current sensor measurements from first and second wireless current sensors. The capacitor bank controller may include a processor that controls one or more switching devices of a capacitor bank based at least in part on a combination of line post sensor measurements and wireless current sensor measurements.

First claim

What is claimed is:

1. A capacitor bank control system, comprising:
a first line post sensor configured to detect current on a first phase of a power line;
a first wireless current sensor configured to detect current on a second phase of the power line;
a second wireless current sensor configured to detect current on a third phase of the power line; and
a capacitor bank controller (CBC) comprising:
an input configured to be electrically coupled to the first line post sensor to obtain line post sensor measurements from the first line post sensor;
a transceiver configured to receive wireless current sensor measurements from the first wireless current sensor and the second wireless current sensor; and
a processor configured to:
receive user settings indicating that the first wireless current sensor is connected to the second phase and the second wireless current sensor is connected to the third phase;
change the CBC from performing control operations using measurements of a single phase to performing control operations of the first phase, the second phase, and the third phase, while the CBC is online; and
control one or more switching devices of a capacitor bank based at least in part on a combination of the line post sensor measurements and the wireless current sensor measurements.

2. The capacitor bank control system of claim 1 , wherein the first line post sensor comprises a combination sensor that provides the CBC with both current measurements and voltage measurements.

3. The capacitor bank control system of claim 2 , comprising:
a first voltage sensor configured to detect voltage on the second phase of the power line; and
a second voltage sensor configured to detect voltage on the third phase of the power line.

4. The capacitor bank control system of claim 3 , wherein the CBC is configured to perform at least one of voltage-ampere reactance (VAR) control and power factor control on each phase by controlling the one or more switching devices of each phase based on the voltage and current from the respective phase.

5. The capacitor bank of claim 1 , wherein the CBC is configured to perform ganged switching control operations to switch the one or more switching devices together to connect or disconnect the capacitor bank phases together based on whether power quality delivered on the power line is expected to improve according to the combination of the line post sensor measurements and the wireless current measurements.

6. The capacitor bank of claim 1 , wherein the CBC is configured to perform individual phase switching control operations in which the CBC controls a switching device on each phase of the capacitor bank independently of the remaining phases.

7. A method for configuring a capacitor bank controller (CBC) of a capacitor bank, comprising:
installing a first wireless current sensor on a first phase of a power line;
installing a second wireless current sensor on a second phase of the power line;
inputting a setting on the CBC indicating that the first wireless current sensor and the second wireless current sensor are connected; and
changing settings of the CBC from performing control operations using measurements of a third phase of the capacitor bank that has a line post sensor performing control operations based on electrical measurements from each of the three phases of the power line, wherein the electrical measurements comprise a combination of line post sensor measurements and wireless current sensor measurements.

8. The method of claim 7 , wherein installing the first wireless current sensor, installing the second wireless current sensor, and changing settings of the capacitor bank controller are performed while the power line is online to retrofit the CBC with current sensing of the first and second phases.

9. The method of claim 7 , wherein the CBC comprises a combination sensor configured to detect both current and voltage of the third phase.

10. The method of claim 9 , comprising changing the CBC from performing ganged switching based on electrical measurements from a single phase of the three phases to performing individual switching in which the CBC is configured to:
control electrical connection of the capacitor bank on the first phase based on current measurements from the first wireless current sensor;
control electrical connection of the capacitor bank on the second phase based on current measurements from the second wireless current sensor; and
control electrical connection of the capacitor bank on the third phase based on electrical measurements from the combination sensor, wherein the control of each of the three phases of the capacitor bank is independent of each other.

11. The method of claim 7 , comprising installing the first wireless current sensor and the second wireless current sensor via a hot stick.

12. A capacitor bank controller (CBC) for an electric power delivery system, comprising:
one or more inputs configured to be electrically coupled to a first line post sensor of a first phase to allow the capacitor bank controller to obtain line post sensor measurements from the first line post sensor;
a transceiver configured to receive wireless current sensor measurements from a first wireless current sensor of a second phase and a second wireless current sensor of a third phase;
memory; and
a processor operatively coupled to the memory, wherein the processor is configured to:
receive user settings indicating that the first wireless current sensor and the second wireless current sensor are connected;
change the CBC from performing control operations using measurements of a single phase of a capacitor bank to performing control operations using measurements of each phase of the capacitor bank;
obtain the line post sensor measurements via the one or more inputs and the wireless current sensor measurements from the first wireless current sensor and the second wireless current sensor via the transceiver; and
control one or more switching devices of the capacitor bank based at least in part on a combination of the line post sensor measurements and the wireless current sensor measurements.

13. The CBC of claim 12 , wherein the processor is configured to individually switch three phases of the capacitor bank based on current measurements from each of the three phases.

14. The CBC of claim 12 , wherein the first line post sensor comprises a combination sensor that provides the CBC with both current measurements and voltage measurements.

15. The CBC of claim 12 , comprising:
a first voltage sensor configured to detect voltage on the second phase of the power line; and
a second voltage sensor configured to detect voltage on the third phase of the power line.

16. The CBC of claim 15 , wherein the CBC is configured to perform at least one of VAR control and power factor control on each phase by controlling the one or more switching devices of each phase based on the voltage and current from the respective phase.

17. The CBC of claim 12 , wherein the CBC is configured to perform ganged switching control operations to switch the one or more switching devices together to connect or disconnect each of the capacitor bank phases together based on whether power quality delivered on the power line is expected to improve according to the combination of the line post sensor measurements and the wireless current measurements.

18. The CBC of claim 12 , wherein the processor is configured to estimate a voltage of a phase of the power line with the first wireless current based at least in part on voltage measure

Assignees

• Schweitzer Engineering Lab Inc

Inventors

• Hao Kei

Classifications

• H02J13/12

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• H02J13/1331

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• Y02E40/30

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• G01R15/183

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• Y02E40/70

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