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Method and device correcting sample data of power system

A technology for sampling data and power systems, which is applied in the field of power systems and can solve problems such as inaccurate judgments

Active Publication Date: 2019-08-02
SIEMENS POWER AUTOMATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in some cases, it is necessary to perform some operations through the original sampling data, such as the instantaneous value algorithm based on the original sampling data, at this time there will be inaccurate judgments

Method used

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  • Method and device correcting sample data of power system
  • Method and device correcting sample data of power system
  • Method and device correcting sample data of power system

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] This embodiment provides a method for correcting sampled data in a power system. The main body of the method is a device for correcting sampled data in a power system. The device can be installed in a relay protection device, or it can be installed separately, and will not be repeated here. repeat.

[0048] Such as figure 1 As shown, it is a schematic flowchart of a method for correcting power system sampling data according to this embodiment. The method includes:

[0049] Step 101, acquire current sampling data of a channel of the power system.

[0050] A power system may have multiple different channels, and the channels here refer to different voltage and current sampling channels. For example, phase A, phase B, and phase C corresponding to voltage / current are equal. There are many kinds of current or voltage to be sampled. The current sampled data here refers to the original sampled data, that is, the sampled data without any correction.

[0051] Step 102, acqu...

Embodiment 2

[0060] This embodiment provides a further supplementary description of the method for correcting the sampled data of the power system in the first embodiment. Such as Figure 2A As shown, it is a schematic flowchart of a method for correcting power system sampling data according to this embodiment. The method includes:

[0061] Step 201, acquire current sampling data of a channel of the power system.

[0062] This step is consistent with step 101 and will not be repeated here.

[0063] Step 202, acquiring last sampling data of the channel.

[0064] This step is consistent with step 102 and will not be repeated here.

[0065] Step 203, obtaining the system frequency of the power system and the phase delay corresponding to the channel.

[0066] The system frequency of the power system can be known in advance, such as 50HZ which is common in China.

[0067] Since a power system may include multiple channels, factors such as the hardware system of each channel will affect it...

Embodiment 3

[0081] This embodiment provides a device for correcting sampled data of a power system, which is used to implement the method for correcting sampled data of a power system in the foregoing embodiments. The device can be located in the relay protector, or it can be set separately.

[0082] Such as image 3 Shown is a schematic structural diagram of a device for correcting power system sampling data according to this embodiment. The device for correcting power system sampling data includes a first acquisition unit 301 , a second acquisition unit 302 and a correction unit 303 .

[0083] Among them, the first acquisition unit 301 is used to acquire the current sampling data of a channel of the power system; the second acquisition unit 302 is used to acquire the last sampling data of the channel; the correction unit 303 is used to perform the current sampling data according to the last sampling data Correction, to obtain the corrected calibration sampling data.

[0084] Optional...

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Abstract

The invention relates to a method and a device correcting sample data of a power system. The method comprises steps of: acquiring current sample data of one channel of the power system; acquiring previous sample data of the channel; and correcting the current sample data according to the previous sample data, and acquiring corrected sample data. Through adoption of the method, the original sampledata is corrected, so that when calculation based on the original data is to determine whether to execute some operations in following steps, the result is obtained rapidly and is accurate. The methodis suitable for an asynchronous sampling mechanism, and can save cost.

Description

technical field [0001] The invention relates to the field of power systems, in particular to a method and a device for correcting sampled data of a power system. Background technique [0002] Relay protection is an important measure to detect faults or abnormal conditions in the power system, thereby sending out alarm signals, or directly isolating and removing the faulty part. Usually, the relay protection device performing the relay protection function judges whether the protection is started by continuously acquiring the sampling values ​​of the power system. [0003] Traditional relay protection devices generally use digital-analog acquisition methods for data sampling. In order to reduce costs, an asynchronous sampling method can be used, that is, the signal channels of AC current and AC voltage that need to be sampled for each channel use the same AD circuit, and the AD circuit needs to convert the sampled data of each channel. Such an asynchronous sampling method ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/25G01R35/02
CPCG01R19/2509
Inventor 王浩周寻官建涛
Owner SIEMENS POWER AUTOMATION