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Analog quantity acquisition control method and device and analog quantity acquisition system

A technology of acquisition control device and control method, applied in electrical program control, measurement using digital measurement technology, program control in sequence/logic controller, etc. To achieve precise synchronization and other issues, to achieve the effect of shortening the reading cycle

Inactive Publication Date: 2020-04-10
XIDIAN POWER RECTIFIER XIAN +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the communication between the main control board and the AD board of the existing acquisition equipment adopts a parallel interface, and the main control board reads the data on each AD board in turn. When the number of cards is large, the reading cycle is too long; in addition, when the serial communication adopts synchronous transmission, it is necessary to add a clock line for each channel. Moreover, the inconsistency of the delay of the sampling device makes the signals unable to achieve accurate synchronization

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  • Analog quantity acquisition control method and device and analog quantity acquisition system
  • Analog quantity acquisition control method and device and analog quantity acquisition system
  • Analog quantity acquisition control method and device and analog quantity acquisition system

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Embodiment Construction

[0052] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiment of the application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the application. Obviously, the described embodiment is only It is an embodiment of a part of the application, but not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0053] Those skilled in the art should understand that the embodiments of the present invention may be provided as methods, systems, or computer program products. Accordingly, the present invention can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermor...

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Abstract

The invention provides an analog quantity acquisition control method, an analog quantity acquisition control device and an analog quantity acquisition system. The method comprises the following steps:acquiring and decoding sampling data of AD boards to obtain a three-phase synchronous voltage; carrying out dq conversion on the three-phase synchronous voltage, and then carrying out moving averageon a d-axis component in a power frequency period to obtain a direct current component; carrying out PI adjustment and integration on the direct-current component to obtain an instantaneous phase; andgenerating a sampling synchronization signal according to the instantaneous phase and a preset sampling rate so as to control the AD boards to perform sampling. By adoption of the technical scheme, the sampling rate of the AD boards can be adjusted according to the sampling data, and the signal synchronization degree is improved. Besides, according to the analog quantity acquisition system provided by the invention, point-to-point serial communication is carried out between each AD board and a main control board through two LVDS, so that the reading period is shortened, and a clock line doesnot need to be added to each channel.

Description

technical field [0001] The invention relates to the technical field of industrial automation control, in particular to an analog quantity acquisition control method and device, and an analog quantity acquisition system. Background technique [0002] Data acquisition and processing is an important part of power system control and protection. Control and protection equipment requires acquisition devices to convert external analog signals into digital quantities for it to realize control and protection functions. There are many current and voltage signals in substations and other sites, and the number of channels that can be collected by existing acquisition equipment is limited, so multiple sampling equipment must be used for sampling. [0003] However, the communication between the main control board and the AD board of the existing acquisition equipment adopts a parallel interface, and the main control board reads the data on each AD board in turn. When the number of cards ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/25G05B19/04
CPCG01R19/25G05B19/04
Inventor 张丽霞冯武彤雷妮李佩泫张树楠
Owner XIDIAN POWER RECTIFIER XIAN
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