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Synchronous sampling method achieving hybrid access of analog quantity and digital quantity

A technology of synchronous sampling and hybrid access, applied in the fields of synchronous sampling of digital hybrid access and analog quantity, it can solve the problem of increasing the complexity of relay protection system, reducing reliability and maintainability, and increasing data transmission delay, etc. problems, to shorten the data preparation time, optimize the processing timing, and achieve the effect of frequency tracking

Inactive Publication Date: 2014-05-14
UNIV OF JINAN
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Problems solved by technology

[0007] The existing technical solution needs to increase the merging unit of analog input, which not only affects the accuracy of data acquisition, increases the delay of data transmission, but also increases the complexity of the relay protection system, reducing the reliability and maintainability

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  • Synchronous sampling method achieving hybrid access of analog quantity and digital quantity
  • Synchronous sampling method achieving hybrid access of analog quantity and digital quantity

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Embodiment Construction

[0025] The embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings and examples, but not as a limitation to the scope of protection of the present invention, all technical solutions obtained by means of equivalent replacement or equivalent transformation are within the scope of protection of the present invention Inside.

[0026] Typical applications of hybrid data source access in smart substations include: figure 1 shown. In the intelligent substation, the high, medium and low sides of the transformer use electronic transformers and electromagnetic transformers respectively. The transformer protection device adopting the current differential principle needs to collect the current of the system at the same moment for differential logic judgment, which is The protection device is required to realize synchronous sampling of mixed access of analog and digital quantities.

[0027] According to the method of th...

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Abstract

The invention discloses a synchronous sampling method achieving the hybrid access of an analog quantity and a digital quantity, and belongs to intelligent substation digital protection. The condition that the simultaneous and direct access of the analog quantity input of an electromagnetic transformer and the digital quantity input of a merging unit is achieved happens to an intelligent substation digital protection device. According to the method, the sampling pulse with an adjustable time interval generated in the digital protection device is used as the standard. On one hand, a built-in AD module of the protection device is started, and AD conversion is carried out on analog quantity input. On the other hand, according to rated time delay, the interpolation time of a digital quantity input data frame is determined, the one-time system electrical quantity, corresponding to the sampling pulse time, of the digital quantity input is calculated through a Lagrange's interpolation method, and therefore synchronous sampling of the digital quantity input and the analog quantity input is achieved. The time interval of the sampling pulse can be adjusted according to signal frequency measured in real time, and equal-angle sampling is achieved to reduce spectrum leakage.

Description

technical field [0001] The invention belongs to the field of relay protection of electric power systems, and in particular relates to a synchronous sampling method for mixed access of analog quantities and digital quantities suitable for digital protection of intelligent substations. Background technique [0002] The power system relay protection system is used to quickly and selectively remove the faulty equipment when the power grid fails, so as to ensure the normal operation of the non-faulty part of the power grid. The relay protection system is an organic whole composed of multiple parts such as transformers, protection devices, and secondary circuits, among which the protection device constitutes the core of the entire system. The transformer is used to transform the high voltage and high current of the primary system into a secondary signal. The secondary signal can be the analog output of the electromagnetic transformer or the digital output of the electronic transfo...

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Application Information

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IPC IPC(8): G01R19/25
Inventor 刘益青王林先高伟聪
Owner UNIV OF JINAN
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