SYSTEMS AND METHODS FOR ASYNCHRONOUS SAMPLING DATA CONVERSION
First Claim
1. A method for selectively connecting a first electrical system and a second electrical system, the method comprising:
- sampling a first alternating electric current having a first frequency at a sampling frequency to obtain a first set of data samples, the sampling frequency corresponding to a system frequency of the first electrical system multiplied by a sampling rate;
sampling a second alternating electric current having a second frequency at the sampling frequency to obtain a second set of data samples;
converting at least one of the first set of data samples and the second set of data samples to a converted set of data samples using a conversion algorithm to compensate for a frequency difference between the first frequency and the second frequency;
determining when the converted set of data samples and at least one of the first set of data samples and the second set of data samples satisfy a predetermined condition; and
actuating a breaker when the predetermined condition is satisfied to selectively connect the first electrical system and the second electrical system.
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Accused Products
Abstract
Disclosed herein are systems and methods for converting data samples representing alternating electric currents. The data samples may be obtained by sampling a first alternating electric current having a first frequency at a sampling frequency, sampling a second alternating electric current having a second frequency at the sampling frequency, and converting the data samples using a conversion algorithm to compensate for any discrepancy caused by the difference between the first frequency and the second frequency. The corrected data samples may be utilized to determine various characteristics of the alternating electric current, such as voltage magnitude, voltage phase angle, current magnitude, current phase angle, and other related attributes. In one application, the systems and methods disclosed herein may be utilized in connection with an intelligent electronic device used to couple a first electrical system, such as a power generator, to a second electrical system, such as a utility intertie.
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Citations
22 Claims
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1. A method for selectively connecting a first electrical system and a second electrical system, the method comprising:
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sampling a first alternating electric current having a first frequency at a sampling frequency to obtain a first set of data samples, the sampling frequency corresponding to a system frequency of the first electrical system multiplied by a sampling rate; sampling a second alternating electric current having a second frequency at the sampling frequency to obtain a second set of data samples; converting at least one of the first set of data samples and the second set of data samples to a converted set of data samples using a conversion algorithm to compensate for a frequency difference between the first frequency and the second frequency; determining when the converted set of data samples and at least one of the first set of data samples and the second set of data samples satisfy a predetermined condition; and actuating a breaker when the predetermined condition is satisfied to selectively connect the first electrical system and the second electrical system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An intelligent electronic device (IED) configured to selectively connect a first electrical system to a second electrical system, the IED comprising:
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a first input configured to sample a first alternating electric current having a first frequency at a sampling frequency to obtain a first set of data samples, the sampling frequency corresponding to a system frequency multiplied by a sampling rate; a second input configured to sample a second alternating electric current having a second frequency at the sampling frequency to obtain a second set of data samples; a processor; a computer-readable storage medium in electrical communication with the processor, the computer-readable storage medium comprising; a data conversion module executable on the processor and configured to compensate for a frequency difference between the first frequency and the second frequency, and to generate a converted set of data samples from at least one of the first set of data samples and the second set of data samples; wherein the IED is configured to determine when the converted set of data samples and at least one of the first set of data samples and the second set of data samples satisfy a predetermined condition; and wherein the IED is configured to actuate a breaker when the predetermined condition is satisfied to selectively connect the first electrical system to the second electrical system. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A system to selectively connect a first electrical system and a second electrical, the system comprising:
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a breaker configured to selectively connect the first electrical system to the second electrical system; and an intelligent electronic device (IED) configured to sample the first alternating electric current at a sampling frequency to obtain a first set of data samples, the sampling frequency corresponding to a system frequency multiplied by a sampling rate, and to sample the second alternating electric current at the sampling frequency to obtain a second set of data samples, the IED comprising; a processor; a computer-readable storage medium in electrical communication with the processor, the computer-readable storage medium comprising a data conversion module executable comprising computer instructions executable on the processor for performing a method of; converting at least one of the first set of data samples and the second set of data samples to a converted set of data samples using a conversion algorithm to compensate for a frequency difference between the first frequency and the second frequency; determining when the converted set of data samples and at least one of the first set of data samples and the second set of data samples satisfy a predetermined condition; and wherein the IED actuates the breaker when the predetermined condition is satisfied to selectively connect the first electrical system and the second electrical system.
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Specification