Managed multi-phase operation

Patent metadata

Field	Value
Publication number	US-9513645-B2
Application number	US-201313782962-A
Country	US
Kind code	B2
Filing date	Mar 1, 2013
Priority date	Mar 1, 2012
Publication date	Dec 6, 2016
Grant date	Dec 6, 2016

Abstract

Systems and methods for maximum deviation multi-phase operation provide techniques for controlling voltage regulators and tap changers in a multi-phase system to operate within a maximum deviation window. The maximum deviation window comprises a low boundary value and a high boundary value. In an example embodiment, systems and methods provide techniques for setting the low boundary value and the high boundary value. In another example embodiment, systems and methods provide techniques for optimized power factor correction in a multi-phase system.

First claim

What is claimed is:

1. A method for maximum deviation multi-phase operation, comprising:
setting, by a voltage regulator controller of a plurality of voltage regulator controllers that are communicatively coupled to each other via a communications link, a low boundary value of a maximum deviation window based on a first highest tap position of a plurality of tap changers and a user-defined maximum deviation value by subtracting the user-defined maximum deviation value from the first highest tap position;
setting, by the voltage regulator controller, a high boundary value of the maximum deviation window based on a first lowest tap position of the plurality of tap changers and the user-defined maximum deviation value by adding the user-defined maximum deviation value to the first lowest tap position; and
independently regulating, by the plurality of voltage regulator controllers, a respective plurality of voltages of a respective plurality of voltage regulators based on the tap positions of the plurality of tap changers.

2. The method of claim 1 , wherein the first highest tap position comprises a current highest tap position, and wherein the first lowest tap position comprises a current lowest tap position.

3. The method of claim 2 , further comprising:
when the low boundary value is greater than the high boundary value after setting the low and high boundary values, setting both the low boundary value and the high boundary value to an average of the highest and the lowest current tap positions of the plurality of tap changers.

4. The method of claim 3 , further comprising:
after setting both the low boundary value and the high boundary value to the average of the highest and the lowest current tap positions of the plurality of tap changers, incrementing the high boundary value of the maximum deviation window and decrementing the low boundary value of the maximum deviation window until the maximum deviation window is equal to the user-defined maximum deviation value.

5. The method of claim 1 , comprising:
determining whether a difference between tap positions of a first tap changer and a second tap changer of the plurality of tap changers and a difference between tap positions of the second tap changer and a third tap changer of the plurality of tap changers are each equal to or greater than the user-defined maximum deviation value;
decrementing each of the high and low boundary values of the maximum deviation window when it is determined that: (a) the differences are each equal to or greater than the user-defined maximum deviation value, (b) the positions of two of the plurality of tap changers are set to the low boundary value, and (c) line voltages output by voltage regulators associated with the two of the plurality of tap changers are above a set voltage band; and
incrementing each of the high and low boundary values of the maximum deviation window when it is determined that: (a) the differences are each equal to or greater than the user-defined maximum deviation value, (b) the positions of two of the plurality of tap changers are set to the high boundary value, and (c) the line voltages output by voltage regulators associated with the two of the plurality of tap changers are below the set voltage band.

6. The method of claim 1 , further comprising:
transmitting the low boundary value and the high boundary value from the voltage regulator controller to a remaining plurality of voltage regulator controllers, wherein the voltage regulator controller is assigned as a lead voltage regulator controller, and wherein the lead voltage regulator controller is selected from the plurality of voltage regulator controllers.

7. The method of claim 1 , further comprising:
controlling the tap positions of the plurality of tap changers to operate within the low boundary value and the high boundary value.

8. A system for maximum deviation multi-phase operation, comprising:
a plurality of voltage regulators;
a plurality of tap changers, each of the plurality of tap changers configured to change a tap position of one of the plurality of voltage regulators;
a plurality of voltage regulator controllers that are communicatively coupled to each other via a communications link,
wherein the plurality of voltage regulator controllers are configured to set tap positions of the plurality of tap changers, wherein one of the plurality of voltage regulator controllers is selected as a lead voltage regulator controller,
wherein the lead voltage regulator controller is configured to:
set a low boundary value of a maximum deviation window based on a first highest tap position of the plurality of tap changers and a user-defined maximum deviation value by subtracting the user-defined maximum deviation value from the first highest tap position; and
set a high boundary value of the maximum deviation window based on a first lowest tap position of the plurality of tap changers and the user-defined maximum deviation value by adding the user-defined maximum deviation value to the first lowest tap position, and

wherein the plurality of voltage regulator controllers are configured to regulate a respective plurality of voltages of the plurality of voltage regulators based on the tap positions of the plurality of tap changers.

9. The system for maximum deviation multi-phase operation of claim 8 , wherein the first highest tap position comprises a current highest tap position, and where the first lowest tap position comprises a current lowest tap position.

10. The system for maximum deviation multi-phase operation of claim 8 , wherein the lead controller is further configured to:
determine whether a difference between tap positions of a first tap changer and a second tap changer of the plurality of tap changers and a difference between tap positions of the second tap changer and a third tap changer of the plurality of tap changers are each equal to or greater than the user-defined maximum deviation value;
decrement each of the high and low boundary values of the maximum deviation window when it is determined that: (a) the differences are each equal to or greater than the user-defined maximum deviation value, (b) the positions of two of the plurality of tap changers are set to the low boundary value, and (c) line voltages output by voltage regulators associated with the two of the plurality of tap changers are above a set voltage band; and
increment each of the high and low boundary values of the maximum deviation window when it is determined that: (a) the differences are each equal to or greater than the user-defined maximum deviation value, (b) the positions of two of the plurality of tap changers are set to the high boundary value, and (c) the line voltages output by voltage regulators associated with the two of the plurality of tap changers are below the set voltage band.

11. The system for maximum deviation multi-phase operation of claim 8 , wherein the plurality of voltage regulator controllers control the tap positions of the plurality of tap changers to operate within the low boundary value and the high boundary value.

12. The system for maximum deviation multi-phase operation of claim 8 ,
wherein the plurality of voltage regulator controllers comprise a first voltage regulator controller, a second voltage regulator controller, and a third voltage regulator controller,
wherein the plurality of tap changers comprise a first tap changer associated with the first voltage regulator controller, a second tap changer associated with the second voltage regulator controller, and a third tap changer associated with the third voltage regulator controller, and
wherein the first regulator controller is

Assignees

• Daley Daniel J
• Colopy Craig A
• Coughlin Christopher J
• Kumar Hanish
• Kinsley Gavin R
• Du Zhongmin
• Cooper Technologies Co

Inventors

• Daley Daniel J
• Colopy Craig A
• Coughlin Christopher J
• Kumar Hanish
• Kinsley Gavin R
• Du Zhongmin

Classifications

• H02M5/10

  using transformers · CPC title

• H02P13/06

  by tap-changing; by rearranging interconnections of windings · CPC title

• H02M1/4216

  operating from a three-phase input voltage (H02M1/4233 takes precedence) · CPC title

• H02M1/42 Primary

  Circuits or arrangements for compensating for or adjusting power factor in converters or inverters · CPC title

• G05F1/14 Primary

  using tap transformers or tap changing inductors as final control devices · CPC title