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Method and device for adjusting pulse sampling time interval

A technology of sampling time and time interval, which is applied in the direction of measuring device, frequency measuring device, phase angle between voltage and current, etc., and can solve problems such as phase mutation of synchronized phasor output

Active Publication Date: 2021-09-14
XUJI GRP +4
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a method and device for adjusting the pulse sampling time interval, which are used to solve the problem that the phase of the synchronous phasor output changes suddenly caused by not adjusting the sampling period when the external time synchronization pulse changes suddenly.

Method used

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  • Method and device for adjusting pulse sampling time interval
  • Method and device for adjusting pulse sampling time interval
  • Method and device for adjusting pulse sampling time interval

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Embodiment Construction

[0019] Method example:

[0020] This embodiment provides a method for adjusting the pulse sampling time interval. When the external timing pulse grows from scratch or the period changes, the method that the local timing pulse gradually approaches the external timing pulse is used to prevent the device from The sampling sequence number of mutated. Combine below Figure 4 , to describe the method in detail.

[0021] Step 1. When the external timing pulse changes, that is, from scratch or periodic changes, determine the availability of the received external pulse (recorded as the current timing pulse): if it is not available, the local timing pulse does not follow the external pulse , is still in the punctual state; if available, sampling is performed according to the original sampling frequency N (the product of the original sampling frequency and the original sampling time interval is 1) until the punctual pulse is sampled, which is recorded as the current punctual pulse.

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Abstract

The invention belongs to the technical field of power system control, and in particular relates to a pulse sampling time interval adjustment method and device. When the time synchronization pulse is received again or the period of the time synchronization pulse changes, record the received time synchronization pulse as the current time synchronization pulse; perform sampling according to the original sampling time interval until the current time synchronization pulse arrives; according to the current time synchronization pulse and the current time synchronization pulse The first time interval between the timing pulses, the period of the timing pulse and the set adjustment time, modify the original sampling time interval to obtain the adjusted sampling time interval; starting from the current timing pulse, according to the adjusted sampling time Sampling at intervals. The invention avoids sudden changes in the phase of the synchronized phasor output of the device, so that the phase of the analog phasor does not vibrate significantly, and ensures the stability of the main station side in power grid stability prediction and control, model verification, relay protection, fault location, etc. The function works normally.

Description

technical field [0001] The invention belongs to the technical field of power system control, and in particular relates to a pulse sampling time interval adjustment method and device. Background technique [0002] Synchronous phasor measurement devices and stability control devices can monitor and control the dynamic process of the power system, with the purpose of providing synchronous dynamic information at each node of the interconnected power grid, providing dynamic security monitoring and stability control of the power grid in a wide area, and the synchronous clock It is a necessary prerequisite for wide-area measurement of power systems. [0003] Sampling clock synchronization is a necessary condition for correct RMS and phase angle calculation. On the one hand, the synchronous clock module drives the ADC to sample the three-phase voltage and current signals at the same time under the trigger of the PPS pulse, and provides pulse signals at the time of analog signal samp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/25G01R25/00G01R21/133G01R23/02
CPCG01R19/25G01R21/133G01R23/02G01R25/00
Inventor 尹明余高旺于同伟李籽良蔺立郑业兵杨凯李杰赵会彬李磊马小燕
Owner XUJI GRP
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