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Method for calibrating characteristic waves of power network by utilizing clock stamp and system

A technology of power grid and clock stamping, applied to clocks, clocks, electrical components driven by synchronous motors, etc., can solve problems such as large clock errors, unreasonable conclusions, misunderstandings, etc., to eliminate low precision, improve computing efficiency, reduce The effect of data transfer volume

Active Publication Date: 2011-10-19
郑州威科姆科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to realize the above functions, if there is no unified standard time in the whole electric power system, or the clock errors of each subsystem are large, unreasonable conclusions or misunderstandings will inevitably be produced
[0005] The WESDAC-32EMS energy management system installed and put into operation in 1988 by the General Commissioner of the North China Power Grid adopted a Philips clock system with a nominal accuracy of 1 ns. The operating clock error is considerable, and the operation and maintenance personnel have to refer to a standard clock for regular manual calibration, so it can only meet the time accuracy requirements in the master station system, and cannot play the role of standard time in the entire system of the North China Power Grid

Method used

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  • Method for calibrating characteristic waves of power network by utilizing clock stamp and system
  • Method for calibrating characteristic waves of power network by utilizing clock stamp and system

Examples

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Effect test

Embodiment 1

[0027] A method of using clock stamps to calibrate the characteristic waves of the power grid. It receives Beidou / GPS satellite signals and generates standard time information; while sampling the voltage and current waveforms of the power grid, it records the time when the sampling interruption signal occurs and generates clock stamps , using the clock stamp to calibrate the characteristic wave of the power network, which specifically includes the following steps:

[0028] ① Sampling the voltage and current waveforms of the power grid to obtain discrete voltage and current sampling values; while sampling, receive signals from Beidou / GPS satellites, generate standard time information, maintain and process the above time information, and record the sampling The moment when the interrupt signal occurs, a clock stamp is generated. The above-mentioned maintenance and processing of time information includes calling time control algorithm, time format conversion algorithm, time zone ...

Embodiment 2

[0044] A method of using clock stamps to calibrate the characteristic waves of the power grid. It receives Beidou / GPS satellite signals and generates standard time information; while sampling the voltage and current waveforms of the power grid, it records the time when the sampling interruption signal occurs and generates clock stamps , use the above clock stamp to calibrate the characteristic wave of the power network, which includes the following steps:

[0045] ① Sampling the voltage and current waveforms of the power grid to obtain discrete voltage and current sampling values; while sampling, receive signals from Beidou / GPS satellites, generate standard time information, maintain and process the above time information, and record the sampling The moment when the interrupt signal occurs, a clock stamp is generated. The aforementioned maintenance and processing of time information includes time control, time format conversion, time zone conversion and leap second calculation...

Embodiment 3

[0051] A method of using clock stamps to calibrate the characteristic waves of the power grid. It receives Beidou / GPS satellite signals and generates standard time information; while sampling the voltage and current waveforms of the power grid, it records the time when the sampling interruption signal occurs and generates clock stamps , use the above clock stamp to calibrate the characteristic wave of the power network, which includes the following steps:

[0052] ① Sampling the voltage and current waveforms of the power grid to obtain discrete voltage and current sampling values; while sampling, receive signals from Beidou / GPS satellites, generate standard time information, maintain and process the above time information, and record the sampling The moment when the interrupt signal occurs, a clock stamp is generated.

[0053] ② First filter the discrete voltage and current sampling values, and then perform fast Fourier transform to obtain the amplitude and phase of the fundam...

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Abstract

The invention discloses a method for calibrating characteristic waves of a power network by utilizing clock stamps, including the following steps: firstly, the waveform of voltage current of the power network is sampled, and the sampling value of stray voltage current is obtained; satellite signals are received during sampling, standard time information is generated and is maintained and processed, and the time of occurrence of an interrupt signal during sampling is recorded so as to form the clock stamp; secondly, Fourier transform is carried out on the sampling value of the stray voltage current, and the amplitude and the phase positions of fundamental and higher harmonics are obtained; thirdly, sampling instant high-accuracy clock stamps are added to the obtained amplitude and the phase positions of the fundamental and higher harmonics so as to form and transmit a data packet to other sites of the power network. The invention utilizes satellites for time synchronization so as to provide a uniform, high-accuracy and high-precision signal source for a vast geographical region, thereby eliminating the disadvantages of low accuracy of time synchronization, difficult data comparison, high data transmission quantity, and the like of a wide area network.

Description

technical field [0001] The present invention relates to a method for calibrating voltage and current waveforms, in particular to a method for calibrating voltage and current waveforms using standard clock stamps in the field of electric power systems, and relates to the method used for implementing the method system. Background technique [0002] Traditionally, the cornerstone of power system relay protection is the various components of the system, mainly referring to lines, busbars, transformers, etc., which constitute a linear time-invariant system. Knowing the impulse response function of a component, you can know the The impulse response function means that all the behavioral characteristics of this component are known; the connection between the various components of the system does not affect any behavioral characteristics of a certain component; therefore, knowing the impulse response functions of all components should be able to obtain all the behaviors of the entir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00H02H7/26G01R19/00G01R23/16G04G5/00G04G7/02G04R40/00
Inventor 贾小波吴淑琴张征李波
Owner 郑州威科姆科技股份有限公司
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