Automated system approach to analyzing harmonic distortion in an electric power system
First Claim
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1. A method of harmonic distortion monitoring in an electrical power system that includes a plurality of monitoring devices, comprising:
- receiving a representation of a hierarchy of the electrical power system, the hierarchy indicating how the plurality of monitoring devices are linked together in the electrical power system;
receiving data, which is indicative of respective current or voltage signals measured by at least two of the plurality of monitoring devices, from the at least two monitoring devices;
automatically temporally or pseudo-temporally aligning the data received from the at least two monitoring devices to produce synchronized data, by causing the data received from the at least two monitoring devices to be synchronized to a zero-crossing of the respective current or voltage signals measured by the at least two monitoring devices;
responsive to the automatically aligning, receiving harmonic distortion data indicative of harmonic distortion on the electrical power system from the at least two monitoring devices;
determining an electrical characteristic of the harmonic distortion from the harmonic distortion data; and
analyzing the electrical characteristic of the harmonic distortion to determine a location of a harmonic distortion source or a harmonic distortion sink in the electrical power system based on at least the representation of the hierarchy and on the synchronized data.
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Abstract
A method and system to detect and evaluate harmonic distortion in an electrical power system is disclosed. A plurality of monitoring devices is installed in the electrical power system. The hierarchy of the electrical power system is received. Data indicative of harmonic distortion on the electrical power system is received from at least two of the monitoring devices. The data indicative of harmonic distortion is automatically aligned in a temporal or pseudo-temporal context. An electrical characteristic of the harmonic distortion from the data indicative of harmonic distortion is determined.
69 Citations
18 Claims
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1. A method of harmonic distortion monitoring in an electrical power system that includes a plurality of monitoring devices, comprising:
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receiving a representation of a hierarchy of the electrical power system, the hierarchy indicating how the plurality of monitoring devices are linked together in the electrical power system; receiving data, which is indicative of respective current or voltage signals measured by at least two of the plurality of monitoring devices, from the at least two monitoring devices; automatically temporally or pseudo-temporally aligning the data received from the at least two monitoring devices to produce synchronized data, by causing the data received from the at least two monitoring devices to be synchronized to a zero-crossing of the respective current or voltage signals measured by the at least two monitoring devices; responsive to the automatically aligning, receiving harmonic distortion data indicative of harmonic distortion on the electrical power system from the at least two monitoring devices; determining an electrical characteristic of the harmonic distortion from the harmonic distortion data; and analyzing the electrical characteristic of the harmonic distortion to determine a location of a harmonic distortion source or a harmonic distortion sink in the electrical power system based on at least the representation of the hierarchy and on the synchronized data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system to monitor harmonic distortion in an electrical power system, comprising:
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a plurality of monitoring devices in the electrical power system; a central controller coupled to the plurality of monitoring devices; and a computer readable medium encoded with instructions executed by the central controller for directing the central controller to; receive a representation of a hierarchy of the electrical power system, the hierarchy indicating how the plurality of monitoring devices are linked together in the electrical power system; receive data, which is indicative of respective current or voltage signals measured by at least two of the plurality of monitoring devices, from the at least two monitoring devices; and automatically temporally or pseudo-temporally align the data received from the at least two monitoring devices to produce synchronized data, by causing the data received from the at least two monitoring devices to be synchronized to a zero-crossing of the respective current or voltage signals measured by the at least two monitoring devices; responsive to the automatically aligning, receive harmonic distortion data indicative of harmonic distortion on the electrical power system from the at least two monitoring devices; determine an electrical characteristic of harmonic distortion from the harmonic distortion data; and analyze the electrical characteristic of the harmonic distortion to determine a location of a harmonic distortion source or a harmonic distortion sink in the electrical power system based on at least the representation of the hierarchy and on the harmonic distortion data. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A method of determining harmonic distortion on an electrical power system including a plurality of monitoring devices, the method comprising:
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receiving a representation of a hierarchy of the electrical power system, the hierarchy indicating how the plurality of monitoring devices are linked together in the electrical power system; receiving data, which is indicative of respective current or voltage signals measured by at least two of the plurality of monitoring devices, from the at least two monitoring devices; automatically temporally or pseudo-temporally aligning the data received from the at least two monitoring devices to produce synchronized data, by causing the data received from the at least two monitoring devices to be synchronized to a zero-crossing of the respective current or voltage signals measured by the at least two monitoring devices; determining an electrical characteristic of harmonic distortion from the synchronized data; analyzing the electrical characteristic of the harmonic distortion to determine a location of a harmonic distortion source or a harmonic distortion sink in the electrical power system based on at least the representation of the hierarchy and on the synchronized data. - View Dependent Claims (18)
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Specification