Synchronous Sampling Method Realizing Mixed Access of Analog and Digital Quantities

A technology of synchronous sampling and mixed access, which is applied in the field of synchronous sampling of mixed access of digital quantities and analog quantities, which can solve the problems of increasing the complexity of relay protection systems, reducing reliability and maintainability, increasing data transmission delay, etc. problem, achieve the effect of shortening data preparation time, optimizing processing timing, and realizing frequency tracking

Inactive Publication Date: 2016-01-20
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 Realizing Mixed Access of Analog and Digital Quantities
  • Synchronous Sampling Method Realizing Mixed Access of Analog and Digital Quantities

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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

A synchronous sampling method for mixed access of analog and digital quantities suitable for digital protection of smart substations. In the smart substation digital protection device, the analog input of the electromagnetic transformer and the digital input of the merging unit are directly connected at the same time. This method is based on the sampling pulse with adjustable time interval generated inside the digital protection device. On the one hand, it starts the AD module built in the protection device to perform AD conversion on the analog input; on the other hand, it determines the digital input data frame according to the rated delay. At the interpolation time, the primary system electrical quantity corresponding to the sampling pulse time of the digital input is calculated by the Lagrangian interpolation method, so as to realize the synchronous sampling of the digital input and the analog input. The time interval of the sampling pulse can be adjusted according to the signal frequency measured in real time to realize equiangular sampling and 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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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/25
Inventor 刘益青王林先高伟聪
Owner UNIV OF JINAN
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