Method for distinguishing effectiveness two-time continuous sampling values of electric power system

A sampling value and sampling point technology, which is applied in the field of judging the validity of the secondary sampling data of the power system, can solve the problems of unsuitable continuous bad data detection and screening, high requirements on the hardware level of the device, and no threshold value selection method.

Active Publication Date: 2010-12-15
STATE GRID ELECTRIC POWER RES INST +1
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Problems solved by technology

However, it does not give the selection method of the threshold value, and it is not suitable for the detection and screening of continuous bad data. At the same time, there are problems such as a large amount of data calculation and high requirements on the hardware level of the device.

Method used

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  • Method for distinguishing effectiveness two-time continuous sampling values of electric power system
  • Method for distinguishing effectiveness two-time continuous sampling values of electric power system
  • Method for distinguishing effectiveness two-time continuous sampling values of electric power system

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Embodiment Construction

[0054] The present invention will be further described in detail below with reference to the accompanying drawings and examples. However, the invention is not limited to the examples given.

[0055] Such as figure 1 Shown is the flow chart of the 3-point continuous effective discriminant method of sampled values ​​in the present invention. A data buffer with a length equal to 3 is provided. The process involves the following criteria (thresholds),

[0056] 1. The minimum precision threshold of the transformer: determined by the characteristics of the transformer itself;

[0057] 2. The continuous curve can lead to the differential error threshold ε 1 :ε 1 =m 1 A 1 (ωTs ) 2 , m 1 is the first reliability coefficient, and its value range is [2, 7], m 1 Generally take 3, A 1 It is the maximum fundamental wave amplitude of the system current and voltage, for the convenience of setting and calculation, A 1 It can be simply replaced by multiples of the rated value of curr...

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Abstract

The invention relates to a method for distinguishing effectiveness two-time continuous sampling values of an electric power system, which comprises the steps of: establishing a saltus threshold formula of sampling values of curved continuous points and a saltus threshold formula of sampling values of curved discontinuous points, ensuring that the sampling points with saltus values exceeding the saltus threshold of the sampling values of the curved continuous points become the discontinuous points of a curved line, but are used as effective sampling values of the curved line, wherein the saltus values are less than the saltus thresholds of the sampling values of the curved discontinuous points; and analyzing the application of the limit of the minimum precision threshold of a mutual inductor and the periodical characteristic of a current voltage signal of the mutual inductor to the process of judging the effectiveness of the sampling values. On the basis, a delay 3-point continuous effective judgment method and a delay-free 3-point continuous effective judgment method of the sampling values are invented, the right reliability of sampled data is ensured, operation resistance and misoperation of a protection measuring and controlling device and the like are avoided, and the safe and stable operation of the electric power system is protected.

Description

technical field [0001] The invention relates to a method for judging the validity of secondary sampling data in a power system, in particular to a method for real-time identification of abnormal sampling values. Background technique [0002] In the construction of a strong smart grid with UHV as the backbone network vigorously promoted by the State Grid, smart substations are an important node. Information sharing is an important feature of smart substations, including sampling data sharing. The implementation process is that the data sampling process is controlled by the merging unit (MU), and the electronic transformer or MU completes the collection task. The sampled data is summarized, packaged and transmitted by the MU, and is used by various compartment layer equipment such as protection devices. Due to the complexity of the data collection and transmission process, in order to ensure the correctness and reliability of the shared sampling data, avoid invalid data from ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
Inventor 蒋雷海陈建玉俞拙非张哲吴通华曹团结张青杰
Owner STATE GRID ELECTRIC POWER RES INST
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