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Lost sample data processing method based on mathematic models of current and voltage

A technology of sampling data, current and voltage, applied in the direction of electrical components, circuit devices, etc., can solve problems such as protection performance not meeting requirements, expansion of accident impact, and impact on system-level protection coordination.

Active Publication Date: 2010-05-12
NARI TECH CO LTD +1
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Problems solved by technology

Obviously, this approach is to sacrifice the protection action speed in exchange for its reliability. If the system requires protection to quickly remove various faults due to stability problems, the protection performance will not meet the requirements.
At the same time, the disturbed protection device cannot act quickly, or it will affect the coordination of protection at all levels in the system, which will lead to the expansion of the impact of the accident

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  • Lost sample data processing method based on mathematic models of current and voltage
  • Lost sample data processing method based on mathematic models of current and voltage
  • Lost sample data processing method based on mathematic models of current and voltage

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Embodiment Construction

[0034] A kind of loss sampling data processing method based on current and voltage mathematical model of the present invention is characterized in that comprising the following steps:

[0035] 1) Establish a status word for the data of each sampling point in the protection buffer zone. When the corresponding sampling data has a real effective value, set the "valid" flag; when it is invalid, set the "invalid" flag; , during initialization, all sampled data states are set to "invalid";

[0036] 2) Monitor the communication status of the device in real time. When the sampling data frame is found to be abnormal, according to the sampling frequency of the sampling data merging unit (MU), take K forward from the current point position of the protection sampling data buffer (when the MU sampling frequency is 4800 points / When s, the value of K can be 4~8. The following examples refer to the effective sampling data of (values ​​at this sampling rate) consecutive points, to fit the wav...

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Abstract

The invention discloses a lost sample data processing method based on mathematic models of current and voltage, which is characterized by comprising the following steps: during monitoring device communications in real time, when discovering the sample data frames are abnormal, taking valid sample data of K consecutive points from the present point in a protected sample data buffer according to the sampling frequency of a sample data combination unit, calculating the waveform expressions of the present current and voltage, fitting the waveform, then calculating the approximation of the lost sample data by a method of interpolation and marking the corresponding states of the data as estimation until the device receives the correct sample data frames, wherein K is at least 3. The invention provides a sample data interpolation method based on mathematic models of current and voltage, which can solve the problem of delaying or locking of the actions of digital protection devices due to incomplete data sources caused by frame loss / frame error.

Description

technical field [0001] The invention relates to an approximate solution method for data sampling values, which is suitable for processing lost sampling data caused by frame errors / losses in digital substations, and belongs to the technical field of electric power systems. Background technique [0002] In a digital substation, when the data acquisition and transmission part of the process layer is subjected to severe electromagnetic interference, the generation of bit errors will be inevitable, resulting in frame error / frame loss in the transmitted data, resulting in loss of sampled data. When the sampling data is lost, the common measure taken by the current protection device is to block the protection, and then reopen it after the data transmission state is stable. Obviously, this approach is to sacrifice the protection action speed for its reliability. If the system requires protection to quickly remove various faults due to stability problems, the protection performance w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J13/00
Inventor 蒋雷海陈建玉俞拙非袁浩
Owner NARI TECH CO LTD
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