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A Synchronous Timing Method for Distribution Network Phasor Measurement

A technology of phasor measurement and synchronized phasor measurement, which is applied in the direction of radio wave measurement system, measurement device, and measurement of electrical variables, etc. It can solve the problems of low stability, poor punctuality, and low precision, and achieve improved stability and accuracy, eliminate jitter, and improve the effect of synchronous timing accuracy

Active Publication Date: 2020-06-09
TSINGHUA UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to propose a synchronous timing method for distribution network phasor measurement to achieve high precision, high stability, and wide-area synchronous timing to solve the problem of low precision in existing methods. The problem of low stability and poor punctuality

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  • A Synchronous Timing Method for Distribution Network Phasor Measurement
  • A Synchronous Timing Method for Distribution Network Phasor Measurement
  • A Synchronous Timing Method for Distribution Network Phasor Measurement

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Embodiment Construction

[0028] The synchronous timing method for distribution network phasor measurement proposed by the present invention comprises the following steps:

[0029] (1) The synchrophasor measurement unit of the distribution network obtains the second pulse signal from the global satellite navigation system, and the crystal oscillator in the synchrophasor measurement unit of the distribution network counts two adjacent second pulse signals to obtain the crystal oscillator count value , average the count value of multiple crystal oscillators, and round to get the average value of the crystal oscillator count And obtain the variance R of the count value of multiple crystal oscillators;

[0030] (2) The crystal oscillator in the synchronized phasor measurement unit of the distribution network continues to count the second pulse signals of the two adjacent global satellite navigation systems to obtain the crystal oscillator count value N, and subtract the crystal oscillator count average va...

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Abstract

The invention relates to a synchronous time service time keeping method for power distribution network phasor measurement, and belongs to the technical field of electric power system phasor measurement. According to the method, a structure of domesticating local crystal oscillators by satellite signals is used; the satellite signals do not have accumulated errors for a long time; the crystal oscillators have high short-period stability; the features of the satellite signals and the crystal oscillators are combined; the dithering of a GNSS (Global Navigation Satellite System) is eliminated; andthe accumulated errors are reduced. A Kalman wave filter uses input and observation data to make accurate prediction on the second pulse metering value in a next second; the dithering of the GNSS canbe effectively eliminated; and the high-stability and high-accuracy synchronous time tick can be realized. Meanwhile, the Kalman wave filter can make the optimum estimation on the crystal oscillatorfrequency. According to the method, a BP neural network is used for depicting a crystal oscillator frequency model; and when an external GNSS is lost, the time keeping capability of a synchronous clock is effectively improved. The input data of a BP neural network model is from a wave filtering result of the Kalman wave filter; and the accuracy of the network model is ensured.

Description

technical field [0001] The invention relates to a synchronous timing method for distribution network phasor measurement, in particular to a synchronous timing method using a Kalman filter and a BP neural network, and belongs to the technical field of power system phasor measurement. Background technique [0002] With the rapid development of emerging technologies in recent years, modern power systems have incorporated many new elements compared with traditional power systems, and my country's power distribution network is also undergoing rapid development. The development of large-scale distributed new power sources, electric vehicles, and distributed energy storage poses challenges to the safe and stable operation of distribution networks. The addition of these elements makes the operating state of the distribution network more complex and changeable, which poses new challenges to the safe and stable operation of the power system, and at the same time puts forward new requi...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R25/02G01R25/00G01S19/25
CPCG01R25/00G01R25/02G01S19/256
Inventor 李依泽陆超王印峰熊春晖吴京涛
Owner TSINGHUA UNIV
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