Method and system for high-speed power source transfer (HS-PST)

Patent metadata

Field	Value
Publication number	US-9800088-B2
Application number	US-201514673316-A
Country	US
Kind code	B2
Filing date	Mar 30, 2015
Priority date	Mar 30, 2015
Publication date	Oct 24, 2017
Grant date	Oct 24, 2017

Abstract

An electronic device configured to switchover power from a primary source to an alternate source to maintain continuity of power supplied to a load bus. The electronic device includes one or more processors configured to identify availability of the alternate source using source monitoring in order to measure and calculate a tracking frequency for controlling a variable sampling interval of the one or more processors. The processors are configured to store signal samples and associated time stamps into a variable length buffer and store new sample values and associated new time stamps into the fixed length buffer. The processors are configured to determine attributes from samples of the alternate source using the tracking frequency. The processors are configured to execute a source switchover signal when the primary source is unavailable based by comparing load bus attributes to alternate source attributes at an estimated instance of switchover.

First claim

The invention claimed is:

1. An electronic device configured to switchover power supplied from a primary source to an alternate source to maintain continuity of power supplied to a load bus, wherein the electronic device comprises one or more processors configured to:
identify availability of the alternate source using source monitoring in order to measure and calculate a tracking frequency for controlling a variable sampling interval of the one or more processors;
obtain signal samples having associated time stamps from the primary source, the alternate source, and the load bus;
store load bus signal samples and associated time stamps of the load bus into a variable length buffer;
calculate a new time stamp for transferring to a fixed length buffer from a measured load bus signal frequency for applying a dual buffer sampling interval transfer to estimate a new sample value at the calculated new time stamp;
store the new sample value and associated new time stamp into the fixed length buffer;
determine a set of attributes from samples of the alternate source using the tracking frequency and fixed length buffer samples of a load bus supply, wherein the set of attributes comprise a magnitude, an angle, a frequency, a slip, an acceleration, or any combination thereof; and
calculate supervising conditions to execute a source switchover signal when the primary source is unavailable based at least in part on comparing the set of load bus attributes to alternate source attributes at an estimated instance of switchover.

2. The electronic device of claim 1 , wherein the source monitoring comprises continuously monitoring voltage magnitude, frequency, and power quality of the alternate source within a specified range.

3. The electronic device of claim 1 , wherein the variable length buffer is a larger buffer than the fixed length buffer, and wherein the variable length buffer is configured to adjust the variable sampling interval and associated time stamps based on the tracking frequency, wherein the fixed length buffer comprises a predetermined number of samples matching load bus frequency and having associated time stamps.

4. The electronic device of claim 1 , wherein the new sample value and associated new time stamp is estimated by performing dual buffer sampling interval transfer.

5. The electronic device of claim 1 , wherein the magnitude of load bus signals uses a Root-Mean-Square (RMS) value, and the magnitude of the primary and auxiliary supply uses non-recursive full cycle Discrete Fourier Transform (DFT).

6. The electronic device of claim 1 , wherein the one or more processors are configured to calculate the angle of the load bus by utilizing a rotationary recursive Discrete Fourier Transform.

7. The electronic device of claim 1 , wherein the one or more processors are configured to calculate a first derivative and a second derivative of the measured frequency as the slip and the acceleration, respectively.

8. The electronic device of claim 1 , wherein the one or more processors are configured to calculate supervising conditions including but not limited to a resultant vector based on a load bus volts per hertz vector and an alternate source volts per hertz vector, wherein the load bus volts per hertz vector is based on a load bus voltage magnitude value, a load bus phase angle value, and a load bus frequency value, and wherein the alternate source volts per hertz vector is based on an alternate source voltage magnitude value, an alternate source angle value, and an alternate source frequency value.

9. A non-transitory computer-readable medium having stored instructions thereon, wherein the instructions are configured to be executed by an electronic device that is configured to switchover power supplied from a primary source to an alternate source to maintain continuity of power supplied to a load bus, wherein the instructions are configured to:
identify availability of the alternate source using source monitoring in order to measure and calculate a tracking frequency for controlling a variable sampling interval of one or more processors;
obtain signal samples having associated time stamps from the primary source, the alternate source, and the load bus;
store load bus signal samples and associated time stamps of the load bus into a variable length buffer;
calculate a new time stamp for transferring to a fixed length buffer from a measured load bus signal frequency for applying a dual buffer sampling interval transfer to estimate a new sample value at the calculated new time stamp;
store the new sample value and associated new time stamp into the fixed length buffer;
determine a set of attributes from samples of the alternate source using the tracking frequency and fixed length buffer samples of a load bus supply, wherein the set of attributes comprise a magnitude, an angle, a frequency, a slip, an acceleration, or any combination thereof; and
calculate supervising conditions to execute a source switchover signal when the primary source is unavailable based at least in part on comparing the set of load bus attributes to alternate source attributes at an estimated instance of switchover.

10. The non-transitory computer-readable medium of claim 9 , comprising instructions configured to calculate a first derivative and a second derivative of the measured frequency as the slip and the acceleration, respectively.

11. The non-transitory computer-readable medium of claim 10 , comprising instructions configured to calculate supervising conditions including but not limited to a resultant vector based on a load bus volts per hertz vector and an alternate source volts per hertz vector, wherein the load bus volts per hertz vector is based on a load bus voltage magnitude value, a load bus phase angle value, and a load bus frequency value, and wherein the alternate source volts per hertz vector is based on an alternate source voltage magnitude value, an alternate source angle value, and an alternate source frequency value.

12. The non-transitory computer-readable medium of claim 9 , wherein the magnitude of load bus signals uses a Root-Mean-Square (RMS) value, and the magnitude of the primary and auxiliary supply uses non-recursive full cycle Discrete Fourier Transform (DFT).

13. The non-transitory computer-readable medium of claim 9 , wherein the variable length buffer is a larger buffer than the fixed length buffer, and wherein the variable length buffer is configured to adjust the variable sampling interval and associated time stamps based on the tracking frequency, wherein the fixed length buffer comprises a predetermined number of samples matching load bus frequency and having associated time stamps.

14. The non-transitory computer-readable medium of claim 9 , wherein the instructions are configured to calculate the angle of the load bus by utilizing a rotationary recursive Discrete Fourier Transform.

15. The non-transitory computer-readable medium of claim 9 , wherein the instructions are configured to calculate the angle of the load bus by applying Least Error Square with a fixed number of coefficients.

16. An electronic device, comprising:
a processor, wherein the processor is configured to:
measure event attributes associated with a first switchover initiation event, wherein a signal is received from a primary source, an alternative source, a load bus, or any combination thereof, wherein the switchover initiation event comprises switching over power delivered to a load on a load bus from the primary source to the alternative source;
determine an update by comparing the event attributes measurement

Assignees

• Gen Electric

Inventors

• Voloh Ilia
• Kanabar Mitalkumar G
• Sidhu Tarlochan
• Zadeh Mohammad Dadash
• Zamani Amin

Classifications

• H02J9/068

  Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection · CPC title

• G01R21/133

  by using digital technique · CPC title

• H02J9/061 Primary

  for DC powered loads · CPC title

• Y02E40/10

  Flexible AC transmission systems [FACTS] · CPC title

• H02J3/08

  Synchronisation of networks · CPC title