SYSTEM AND METHOD FOR DETECTING A GRID EVENT
First Claim
Patent Images
1. A method to detect a grid event comprising:
- sampling grid voltage and grid current over a fixed period of time;
determining grid impedance at one or more frequencies using the sampled grid voltage and the sampled grid current; and
comparing the grid impedance at the one or more frequencies to a known expected grid impedance at the one or more frequencies; and
detecting a grid event based on the comparison.
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Abstract
A method for detecting a grid event is provided. The method includes sampling grid voltage and grid current over a fixed period of time; determining grid impedance at one or more frequencies using the sampled grid voltage and the sampled grid current; comparing the grid impedance at the one or more frequencies to a known expected grid impedance at the one or more frequencies; and detecting a grid event based on the comparison.
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Citations
20 Claims
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1. A method to detect a grid event comprising:
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sampling grid voltage and grid current over a fixed period of time; determining grid impedance at one or more frequencies using the sampled grid voltage and the sampled grid current; and comparing the grid impedance at the one or more frequencies to a known expected grid impedance at the one or more frequencies; and detecting a grid event based on the comparison. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 12)
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11. A method of detecting a grid event on an electrical grid connected with the one or more electrical machines, said method comprising:
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connecting one or more electrical machines to an alternating current (AC) electric grid, wherein the AC electric grid is configured to transmit at least one phase of electrical power to the one or more electrical machines or to receive at least one phase of electrical power from the one or more electrical machines; electrically coupling at least a portion of a control system to at least a portion of the AC electric grid; coupling at least a portion of the control system in electronic data communication with at least a portion of the one or more electrical machines; detecting a grid event of the AC electric grid based on one or more conditions monitored by the control system wherein the control system is configured to; sample AC grid voltage and AC grid current over a fixed period of time; calculate a frequency transform of the sampled AC grid voltage and sampled AC grid current; determine grid impedance at one or more frequencies using the calculated frequency transform of sampled AC grid voltage divided by the calculated frequency transform of sampled AC grid current; compare the grid impedance at the one or more frequencies to a known expected grid impedance at the one or more frequencies; and detect a grid event based on the comparison. - View Dependent Claims (13, 14, 15, 16)
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17. A control system for detecting a grid event on an alternating current (AC) electrical grid connected with the one or more electrical machines, said AC electric grid configured to transmit at least one phase of electrical power to the one or more electrical machines or to receive at least one phase of electrical power from the one or more electrical machines, said control system comprising:
a controller, wherein the control system is electrically coupled to at least a portion of the AC electric grid and at least a portion of the control system is coupled in electronic data communication with at least a portion of the one or more electrical machines, and wherein said controller is configured to; sample AC grid voltage and AC grid current over a fixed period of time; calculate a transform of the sampled AC grid voltage and sampled AC grid current; determine grid impedance at one or more frequencies using the sampled AC grid voltage and the sampled AC grid current; compare the grid impedance at the one or more frequencies to a known expected grid impedance at the one or more frequencies; and detect a grid event based on the comparison. - View Dependent Claims (18, 19, 20)
Specification