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Небесная энциклопедия

Космические корабли и станции, автоматические КА и методы их проектирования, бортовые комплексы управления, системы и средства жизнеобеспечения, особенности технологии производства ракетно-космических систем

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Мониторинг СМИ и социальных сетей. Сканирование интернета, новостных сайтов, специализированных контентных площадок на базе мессенджеров. Гибкие настройки фильтров и первоначальных источников.

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Применить Всего найдено 11. Отображено 11.
28-01-2016 дата публикации

MOBILE ELECTRIC FIELD SENSOR BASED PHASOR MEASUREMENT UNIT FOR MONITORING AN ELECTRIC POWER GRID

Номер: US20160025785A1
Автор: Yilu Liu, Wenxuan Yao, Lingwei Zhan, Wei Gao, Haoyang Lu
Принадлежит: UNIVERSITY OF TENNESSEE RESEARCH FOUNDATION

A system may include an electric field sensor, an analog to digital converter, and an estimator. The electric field sensor may measure electric fields of electric power grid. The analog to digital converter may generate digital output based upon measurements from the electric field sensor. The estimator may estimate phasor data of the electric power grid based upon the digital output.

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Номер записи: 1
27-12-2022 дата публикации

Pulsar based timing synchronization method and system

Номер: US0011537086B2
Автор: Jiecheng Zhao, Yilu Liu, Yong Liu, Peter Louis Fuhr, Tom King, He Yin, Lingwei Zhan, Marissa Morales-Rodriguez, Wenxuan Yao
Принадлежит: University of Tennessee Research Foundation, UT-Battelle, LLC

A pulsar based timing synchronization method and system are disclosed. In one example, a method includes receiving, by a pulsar signal receiver device, a pulse signal emitted from one or more celestial objects and processing, by the pulsar signal receiver device, the pulse signal to discipline a local clock to determine an accurate time output. The method also includes generating, by the pulsar signal receiver device, a timing synchronization signal based on the determined accurate time output. The method further includes providing, by the pulsar signal receiver device, the timing synchronization signal to at least one of a local power system device and a timing distribution network server.

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Номер записи: 2
19-01-2017 дата публикации

UNIVERSAL GRID ANALYZER

Номер: US20170016940A1
Автор: Yilu Liu, Lingwei Zhan, Wenxuan Yao, LIU YILU, ZHAN LINGWEI, YAO WENXUAN, Liu Yilu, Zhan Lingwei, Yao Wenxuan
Принадлежит: UNIVERSITY OF TENNESSEE RESEARCH FOUNDATION

Embodiments of the present invention may provide a device for monitoring electric power at the distribution level. The device may include an analog-to-digital converter (ADC) to convert an input signal into digital samples at time intervals, a receiver to generate a pulse-per-second (PPS) signal, an oscillator to generate an oscillator signal, and a data processor coupled to the ADC, the receiver, and the oscillator. The data processor may include a counter to measure an oscillator frequency of the oscillator signal at each pulse of the PPS signal, an adjuster to adjust a timer period register value, and a timer to adjust the time intervals based on the adjusted timer period register value. Based on the digital samples, the data processor may generate a plurality of metrics, which may include one or more measurements of frequency, magnitude, phase, harmonic level, signal-to-noise ratio, sag, and swell of the input signal.

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Номер записи: 3
24-03-2020 дата публикации

Universal grid analyzer

Номер: US0010598704B2
Автор: Yilu Liu, Lingwei Zhan, Wenxuan Yao, LIU YILU, ZHAN LINGWEI, YAO WENXUAN, Liu, Yilu, Zhan, Lingwei, Yao, Wenxuan
Принадлежит: UNIVERSITY OF TENNESSEE RESEARCH FOUNDATION, UNIV TENNESSEE RES FOUND, University of Tennessee Research Foundation

Embodiments of the present invention may provide a device for monitoring electric power at the distribution level. The device may include an analog-to-digital converter (ADC) to convert an input signal into digital samples at time intervals, a receiver to generate a pulse-per-second (PPS) signal, an oscillator to generate an oscillator signal, and a data processor coupled to the ADC, the receiver, and the oscillator. The data processor may include a counter to measure an oscillator frequency of the oscillator signal at each pulse of the PPS signal, an adjuster to adjust a timer period register value, and a timer to adjust the time intervals based on the adjusted timer period register value. Based on the digital samples, the data processor may generate a plurality of metrics, which may include one or more measurements of frequency, magnitude, phase, harmonic level, signal-to-noise ratio, sag, and swell of the input signal.

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Номер записи: 4
29-01-2019 дата публикации

Synchrophasor measurement method for power systems

Номер: US0010191094B2
Автор: Wenxuan Yao, Jiecheng Zhao, Yilu Liu, Andrew N. Herron, Daniel J. King, Thomas J. King, Jr., Lingwei Zhan, YAO WENXUAN, ZHAO JIECHENG, LIU YILU, HERRON ANDREW N, KING DANIEL J, KING JR THOMAS J, ZHAN LINGWEI, Yao, Wenxuan, Zhao, Jiecheng, Liu, Yilu, Herron, Andrew N., King, Daniel J., King, Jr., Thomas J., Zhan, Lingwei
Принадлежит: University of Tennessee Research Foundation, UT-Battelle, LLC, UNIV TENNESSEE RES FOUND, UT BATTELLE LLC, UT-BATTELLE, LLC

A synchrophasor measurement method for a device configured to take synchronized measurements in a power system is provided. The synchrophasor measurement method includes receiving global positioning system (GPS)-synchronized samples of a signal sensed by the device from the power system; determining a level of distortion of the signal; selecting, based on the level of distortion, a computation method, the computation method being one of an improved zero-crossing (IZC) method and an enhanced phase-lock-loop (EPLL) method; performing the selected computation method to determine at least one parameter of the signal at a reporting frequency, which is at least twice a line frequency of the power system; and outputting, at the reporting frequency, the at least one parameter to an operator of the power system to allow the operator to perform at least one of a monitoring and a controlling of at least one element of the power system.

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Номер записи: 5
17-07-2018 дата публикации

Mobile electric field sensor based phasor measurement unit for monitoring an electric power grid

Номер: US0010024897B2
Автор: Yilu Liu, Wenxuan Yao, Lingwei Zhan, Wei Gao, Haoyang Lu, LIU YILU, YAO WENXUAN, ZHAN LINGWEI, GAO WEI, LU HAOYANG, Liu, Yilu, Yao, Wenxuan, Zhan, Lingwei, Gao, Wei, Lu, Haoyang
Принадлежит: UNIVERSITY OF TENNESSEE RESEARCH FOUNDATION, UNIV TENNESSEE RES FOUND, University of Tennessee Research Foundation

A system may include an electric field sensor, an analog to digital converter, and an estimator. The electric field sensor may measure electric fields of electric power grid. The analog to digital converter may generate digital output based upon measurements from the electric field sensor. The estimator may estimate phasor data of the electric power grid based upon the digital output.

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Номер записи: 6
31-10-2019 дата публикации

PULSAR BASED TIMING SYNCHRONIZATION METHOD AND SYSTEM

Номер: US20190332067A1
Автор: Jiecheng Zhao, Yilu Liu, Yong Liu, Peter Louis Fuhr, Tom King, He Yin, Lingwei Zhan, Marissa Morales-Rodriguez, Wenxuan Yao
Принадлежит:

A pulsar based timing synchronization method and system are disclosed. In one example, a method includes receiving, by a pulsar signal receiver device, a pulse signal emitted from one or more celestial objects and processing, by the pulsar signal receiver device, the pulse signal to discipline a local clock to determine an accurate time output. The method also includes generating, by the pulsar signal receiver device, a timing synchronization signal based on the determined accurate time output. The method further includes providing, by the pulsar signal receiver device, the timing synchronization signal to at least one of a local power system device and a timing distribution network server.

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Номер записи: 7
21-10-2021 дата публикации

FAULT-TOLERANT GRID FREQUENCY MEASUREMENT ALGORITHM DURING TRANSIENTS

Номер: US20210328431A1
Автор: Lingwei Zhan, Thomas J. King, JR., Fuhua Li, Yilu Liu, Wenxuan Yao, He Yin, Bailu Xiao
Принадлежит:

A system determines the frequency of grid signals corresponding to an electrical grid in real time. The system includes a transient detector that monitors a grid signal from a voltage meter or a current meter connected to the electrical grid. The system produces, in real time and at a sampling rate, a deviation signal indicative of a periodicity of the monitored grid signal. The system determines, over one or more cycles of the monitored grid signal, a measurement signal corresponding to the deviation signal. The system determines a frequency signal that corresponds a frequency estimation of the monitored signal by applying a frequency estimation when values of the measurement signal are less than a deviation threshold and maintaining the frequency signal at a constant value when values of the measured signal equal or exceeds the deviation threshold.

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Номер записи: 8
29-07-2021 дата публикации

APPARATUS, METHODS AND COMPUTER-READABLE MEDIUM FOR EFFICIENT ELECTRICAL GRID MEASUREMENTS

Номер: US20210231716A1
Автор: Lingwei Zhan, Bailu Xiao, He Yin, Fuhua Li, Wenxuan Yao, Zhi Li, Thomas King, Yilu Liu
Принадлежит:

Respective phasor values are recursively computed from respective ones of a series of signal samples for a node of a power system such that each phasor value is computed from a previously computed phasor value. Frequency values are recursively computed from the phasor values for respective ones of the signal samples. Recursive computing of frequency values may include computing respective phase angle values from respective ones of the phasor values, recursively computing coefficient values for a polynomial that fits the phase angle values, and recursively computing the frequency values from the coefficient values. The samples may be generated at a sampling rate and the phasor values and the frequency values may be produced at a rate that is the same as the sampling rate. Embodiments may provide methods, apparatus and computer readable media that implement such operations. 1. A method comprising:recursively computing respective phasor values from respective ones of a series of signal samples for a node of a power system such that each phasor value is computed from a previously computed phasor value; andrecursively computing frequency values from the phasor values for respective ones of the signal samples.2. The method of claim 1 , wherein recursively computing frequency values comprises:computing respective phase angle values from respective ones of the phasor values;recursively computing coefficient values for a polynomial that fits the phase angle values; andrecursively computing the frequency values from the coefficient values.3. The method of claim 1 , wherein recursively computing frequency values comprises:computing a first phase angle value from a first phasor value for a first sample;computing a first value for a coefficient of a polynomial that fits the phase angle value from the first phase angle value;computing a first frequency value for the first sample from the first value for the coefficient;computing a second phase angle value for a second phasor ...

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Номер записи: 9
06-12-2018 дата публикации

SYNCHROPHASOR MEASUREMENT METHOD FOR POWER SYSTEMS

Номер: US20180348266A1
Автор: HERRON Andrew N., JR. Thomas J., King, King Daniel J., Liu Yilu, Yao Wenxuan, Zhan Lingwei, Zhao Jiecheng
Принадлежит:

A synchrophasor measurement method for a device configured to take synchronized measurements in a power system is provided. The synchrophasor measurement method includes receiving global positioning system (GPS)-synchronized samples of a signal sensed by the device from the power system; determining a level of distortion of the signal; selecting, based on the level of distortion, a computation method, the computation method being one of an improved zero-crossing (IZC) method and an enhanced phase-lock-loop (EPLL) method; performing the selected computation method to determine at least one parameter of the signal at a reporting frequency, which is at least twice a line frequency of the power system; and outputting, at the reporting frequency, the at least one parameter to an operator of the power system to allow the operator to perform at least one of a monitoring and a controlling of at least one element of the power system. 1. A synchrophasor measurement method for a device configured to take synchronized measurements in a power system , comprising:receiving global positioning system (GPS)-synchronized samples of a signal sensed by the device from the power system;determining a level of distortion of the signal;selecting, based on the level of distortion, a computation method, the computation method being one of an improved zero-crossing (IZC) method and an enhanced phase-lock-loop (EPLL) method;performing the selected computation method to determine at least one parameter of the signal at a reporting frequency, which is at least twice a line frequency of the power system; andoutputting, at the reporting frequency, the at least one parameter to an operator of the power system to allow the operator to perform at least one of a monitoring and a controlling of at least one element of the power system.2. The synchrophasor measurement method of claim 1 , wherein the signal is one of a voltage and a current signal.3. The synchrophasor measurement method of claim 1 , ...

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Номер записи: 10
30-01-2024 дата публикации

Fault-tolerant grid frequency measurement algorithm during transients

Номер: US11882889B2
Автор: Bailu Xiao, Fuhua Li, He Yin, Lingwei Zhan, Thomas J. KING, JR., Wenxuan Yao, Yilu Liu
Принадлежит: UT Battelle LLC

A system determines the frequency of grid signals corresponding to an electrical grid in real time. The system includes a transient detector that monitors a grid signal from a voltage meter or a current meter connected to the electrical grid. The system produces, in real time and at a sampling rate, a deviation signal indicative of a periodicity of the monitored grid signal. The system determines, over one or more cycles of the monitored grid signal, a measurement signal corresponding to the deviation signal. The system determines a frequency signal that corresponds a frequency estimation of the monitored signal by applying a frequency estimation when values of the measurement signal are less than a deviation threshold and maintaining the frequency signal at a constant value when values of the measured signal equal or exceeds the deviation threshold.

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Номер записи: 11