System and method for assessing power distribution systems

• US 8,996,323 B1
• Filed: 06/30/2011
• Issued: 03/31/2015
• Est. Priority Date: 06/30/2011
• Status: Expired due to Fees

• Current Assignee: Amazon Technologies, Inc. (Amazon.com, Inc.)
• Original Assignee: Amazon Technologies, Inc. (Amazon.com, Inc.)
• Inventors: Morales, Osvaldo P., Czamara, Michael P.
• Primary Examiner(s): Henson, Mischita
• Assistant Examiner(s): QUIGLEY, KYLE ROBERT
• Application Number:
  US13/173,102
• Time in Patent Office: 1,370 Days
• Field of Search: 702/57, 702/58, 702/81
• US Class Current: 702/58
• CPC Class Codes: G01R 31/086 in power transmission or distribution networks, i.e. with interconnected conductors
• CPC Class Codes: Y04S 10/52 Outage or fault management, e.g. fault detection or location

Abstract

A method of assessing an electrical power distribution system includes establishing a baseline signature for one or more points in the power distribution system and assessing the power distribution system using the baseline signatures. Establishing the baseline signatures includes injecting one or more input signals (for example, a tone) at one or more injection points in the power distribution system, sensing one or more output signals at one or more sensing points in the power distribution system, and establishing a baseline signature for one or more of the points based on one or more of the output signals.

Claims

1. A method, comprising:

generating a map of at least a portion of a power distribution system included in a data center and configured to distribute electrical power to at least one rack computer system, wherein generating the map comprises;

injecting one or more input signals at one or more output receptacles of one or more power distribution components in the power distribution system such that the one or more input signals propagate through at least one power distribution component of the plurality of power distribution components in the power distribution system via one or more electrical conductors coupled to the power distribution components, wherein the power distribution components comprise one or more of;

an electrical power transformer configured to transform utility power received at the data center,

a switchgear apparatus configured to selectively distribute electrical power from a selected one of the transformer or an electrical generator;

or

an uninterruptible power supply configured to provide uninterrupted power to rack computer systems in the event of a power failure upstream from the uninterruptible power supply;

sensing one or more output signals at one or more output receptacles of one or more power distribution components, wherein the one or more output signals at the one or more output receptacles result, at least in part, from the propagation of the one or more input signals through at least one of the plurality of power distribution components and cumulative alteration of the one or more input signals via successive propagation through each of the at least one of the plurality of power distribution components;

based on the one or more output signals, determining separate baseline signatures for each of the plurality of power distribution components, wherein each baseline signature is associated with a separate alteration of the one or more input signals via propagation through a separate respective power distribution component of the plurality of power distribution components; and

generating the map of the power distribution system based on one or more of the output signals, wherein the map includes the baseline signatures corresponding to each of the plurality of power distribution components; and

assessing the power distribution system, wherein assessing the power distribution system comprises;

injecting one or more input signals, using a power assessment device, at one or more output receptacles of a particular power distribution component, such that the one or more input signals initially propagate upstream through the plurality of power distribution components via one or more electrical conductors coupled to the power distribution components to a particular upstream power distribution component, via one or more electrical conductors coupled to the power distribution components, and subsequently propagate downstream from the particular upstream power distribution component and through the plurality of power distribution components to the same particular power distribution component;

sensing one or more output signals, using the same power assessment device, at one or more output receptacles of the same particular power distribution component, wherein the one or more output signals at the one or more output receptacles result, at least in part, from the initial propagation of the one or more input signals upstream through the plurality of power distribution components and subsequent propagation of the one or more input signals downstream through the plurality of power distribution components, wherein the one or more output signals are cumulatively altered from the one or more input signals via successive propagation through each of the plurality of power distribution components; and

assessing a power distribution condition of at least one of the power distribution components in the power distribution system by comparing the sensed one or more output signals received at the one or more output receptacles of the same particular power distribution component at which the one or more input signals are injected with one or more baseline signatures included in the map.

2. The method of claim 1, wherein generating of at least a portion of the map of the power distribution system is concurrent with assessing at least a portion of the power distribution system.

3. The method of claim 1, wherein assessing one or more conditions or components in the power distribution system comprises assessing one or more deviations from at least one baseline signature in the map, wherein assessing deviations from the baseline signature comprises comparing one of the sensed output signals to at least one of the output signals used to generate the map.

4. The method of claim 1, wherein assessing one or more conditions or components in the power distribution system comprises detecting a change in the configuration of the power distribution system from the configuration at the time the map was generated.

5. The method of claim 1, wherein assessing one or more conditions or components in the power distribution system comprises detecting an electrical anomaly in the power distribution system.

6. The method of claim 1, wherein assessing one or more conditions or components in the power distribution system comprises the loss or failure of a component in the power distribution system.

7. The method of claim 1, wherein assessing one or more conditions or components in the power distribution system comprises identifying a component or a type of component in the power distribution system.

8. A method of assessing an electrical power distribution system, comprising:

establishing a plurality of baseline signatures for a plurality of power distribution components in the power distribution system, wherein the establishing the plurality of baseline signatures comprises;

injecting one or more input signals at one or more output receptacles of at least one power distribution component, such that the one or more input signals propagate through at least one power distribution component of the plurality of power distribution components in the power distribution system, via one or more electrical conductors coupled to the power distribution components;

sensing one or more output signals at one or more output receptacles of at least one power distribution component, wherein the one or more output signals at the one or more output receptacles result, at least in part, from the propagation of the one or more input signals through the at least one power distribution component and cumulative alteration of the one or more input signals via successive propagation through each of the at least one of the plurality of power distribution components in the power distribution system; and

based on the one or more output signals, establishing the plurality of baseline signatures for the plurality of power distribution components, wherein each baseline signature is associated with a separate power distribution component of the plurality of power distribution components and indicates a particular alteration of the one or more input signals caused via propagation through the separate respective power distribution component of the plurality of power distribution components; and

assessing the power distribution system, wherein assessing the power distribution system comprises;

injecting one or more input signals, using a power assessment device, at one or more output receptacles of a particular power distribution component, such that the one or more input signals initially propagate upstream through the plurality of power distribution components to a particular upstream power distribution component, via one or more electrical conductors coupled to the power distribution components, and subsequently propagate downstream from the particular upstream power distribution component and through the plurality of power distribution components to the same particular power distribution component;

sensing one or more output signals, using the same power assessment device, at one or more output receptacles of the same particular power distribution component, wherein the one or more output signals at the one or more output receptacles result, at least in part, from the initial propagation of the one or more input signals upstream through the plurality of power distribution components and subsequent propagation of the one or more input signals downstream through the plurality of power distribution components, wherein the one or more output signals are cumulatively altered from the one or more input signals via successive propagation through each of the plurality of power distribution components in the power distribution system;

based upon the one or more output signals received at the same particular power distribution component at which the one or more input signals are injected, determining a present signature associated with one power distribution component of the plurality of power distribution components, where the one power distribution component is separate and upstream from the particular power distribution component in the power distribution system; and

assessing one or more conditions of the one power distribution component based at least in part upon a comparison of the determined present signature associated with one power distribution component with a corresponding baseline signature associated with the one power distribution component;

wherein the plurality of power distribution components are configured to distribute electrical power to at least one electrical load and comprise one or more of;

an electrical power transformer configured to transform utility power,

a switchgear apparatus configured to selectively distribute electrical power from a selected one of the transformer or an electrical generator, or

an uninterruptible power supply configured to provide uninterrupted power to rack computer systems in the event of a power failure upstream from the uninterruptible power supply.

9. The method of claim 8, wherein establishing a baseline signature for at least one of the power distribution components based on one or more of the output signals comprises generating a map of the power distribution based on the output signals.

10. The method of claim 8, wherein:

the one or more output signals comprises a waveform that is a composite of the one or more input signals and a plurality of harmonic signatures, each harmonic signature is associated with a separate power distribution component through which the input signal propagates,

establishing the plurality of baseline signatures for the plurality of power distribution components includes processing the one or more output signals to resolve the plurality of harmonic signatures, wherein each of the resolved harmonic signatures is a baseline signature associated with a separate power distribution component of the power distribution system,

comparing the determined present signature with the corresponding baseline signature includes;

processing the sensed output signals to determine at least one of the harmonic signatures, each of the at least one determined harmonic signatures is a present signature associated with a separate power distribution component, and

comparing at least one determined present signature associated with one of the power distribution components with a corresponding baseline signature associated with the one of the power distribution components.

11. The method of claim 8, further comprising monitoring an output signal from at least one of the sensing points during operation of the power distribution system to supply power to electrical systems.

12. The method of claim 8, further comprising generating a map of the power distribution system based on signatures at two or more sensing points.

13. The method of claim 12, further comprising updating the map of the power distribution system based on one or more changes to the power distribution system.

14. The method of claim 12, wherein assessing one or more conditions or components in the power distribution system comprises identifying, based on information from the map, a portion of the power distribution system affected by an electrical anomaly or by an actual or potential failure of a power distribution component in the power distribution system.

15. The method of claim 12, wherein assessing the power distribution system comprises identifying, based on information from the map, a location or connection associated with one or more output signals relative to one or more power distribution components in the power distribution system.

16. The method of claim 8, wherein at least one of the sensed output signals is acquired from the same component as that of at least one of the injected input signals.

17. The method of claim 8, wherein at least one of the sensed output signals is acquired from a different component than that of at least one of the injected input signals.

18. The method of claim 8, wherein at least one of the injection points is upstream from at least one power distribution unit.

19. The method of claim 8, wherein at least one of the baseline signatures is established concurrent with assessing at least a portion of the power distribution system.

20. A system for assessing an electrical power distribution system, comprising:

a power distribution assessment device configured to assess an electrical power distribution system which comprises a plurality of power distribution components, wherein the power distribution assessment device comprises;

one or more signal injection devices, wherein at least one of the signal injection devices is configured to inject an input signal into one or more output receptacles of a particular power distribution component such that the input signal initially propagates upstream through a plurality of power distribution components, via one or more electrical conductors coupled to the power distribution components, to a particular upstream power distribution component, via one or more electrical conductors coupled to the power distribution components, and subsequently propagates downstream from the particular upstream power distribution component and through the plurality of power distribution components to the same particular power distribution component;

one or more signal sensing devices, wherein at least one of the signal sensing devices is configured to sense, at one or more output receptacles of the same particular power distribution component, one or more output signals resulting, at least in part, from the initial propagation of at least one of the input signals upstream through the plurality of power distribution components and the subsequent propagation of the at least one of the input signals downstream through the plurality of power distribution components, and cumulative alteration of the input signal via successive propagation through each of the plurality of power distribution components; and

wherein the power distribution assessment device is configured to assess at least one power distribution component in the power distribution system based on a comparison of the one or more output signals to a baseline signature associated with a particular alteration of the input signal via propagation through the at least one power distribution component, wherein the at least one power distribution component is upstream and separate from the particular power distribution component;

wherein the plurality of power distribution components comprises one or more of;

an electrical power transformer configured to transform utility power received at an upstream terminus of the electrical power distribution system,

a switchgear apparatus configured to selectively distribute electrical power from a selected one of the transformer or an electrical generator;

or

an uninterruptible power supply configured to distribute uninterrupted electrical power in the event of a power failure upstream from the uninterruptible power supply.

21. The system of claim 20, wherein the system is configured to assess at least one component or condition in the power distribution system based on one or more of the output signals.

22. The system of claim 20, wherein the system is configured to:

compute, based at least in part on the sensed output signals, the one or more baseline signatures at one or more points in the power distribution system.

23. The system of claim 20, wherein at least one of the sensing devices is configured to monitor the power distribution system for changes in one or more of the signatures while the power distribution system is distributing power to electrical systems.

24. The system of claim 20, wherein the one or more signal sensing devices are configured to sense output signals at two or more points in the power distribution system.

25. The system of claim 20, wherein at least one of the signal sensing devices is configured to sense an output signal at sensing points at two or more different levels of the power distribution system.

26. The system of claim 20, wherein the system is configured to sense at least one output signal at a different level in the power distribution system than at least one of the injection points for at least one the input signals.

27. The system of claim 20, wherein at least one of the signal injection devices or the signal sensing devices is configured to couple in an output receptacle of a PDU.

28. The system of claim 20, wherein the system is configured to create and store a map comprising baseline signatures for two or more points in the power distribution system.

29. The system of claim 20, wherein the system is configurable to trace a failure in the power distribution system to a particular branch of the power distribution system.

30. The system of claim 20, wherein the system is configurable to trace a failure in the power distribution system to a particular leg of current in the power distribution system.