A Line Current Differential Protection Method Based on Secondary Data Transformation

A differential protection and secondary data technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems of reducing system communication traffic and large communication traffic, and achieve the ability to reduce system communication traffic, speed up the process, and withstand excessive resistance strong effect

Active Publication Date: 2017-08-01
CHINA THREE GORGES UNIV
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Problems solved by technology

[0004] In order to solve the problem of large communication traffic in the wide-area current differential protection method, and realize the effective reduction of system communication traffic without reducing the operating characteristics of the differential protection, the present invention provides a line current difference based on secondary data conversion protection method

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  • A Line Current Differential Protection Method Based on Secondary Data Transformation
  • A Line Current Differential Protection Method Based on Secondary Data Transformation
  • A Line Current Differential Protection Method Based on Secondary Data Transformation

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings.

[0026] Such as Figure 1-Figure 3 As shown, a line current differential protection method based on secondary data conversion, the protection method includes the following steps:

[0027] Step 1: The intelligent electronic device IED reads the three-phase current value collected from the secondary side of the current transformer in real time Among them, m represents the measured current of node m, and other nodes are defined in a similar manner.

[0028] Step 2: Use the FFT algorithm to calculate the phasors of the three-phase currents, and use the amplitude and phase to represent the three-phase current I Am ∠α Am , I Bm ∠α Bm , I Cm ∠α Cm .

[0029] Step 3: Carry out secondary data transformation on the three-phase current phasor. The transformation adopts the principle of non-uniform quantization. The non-uniformity is reflected in the division of low-valu...

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Abstract

Provided is a line current differential protection method based on secondary data conversion. According to the method, a primary data conversion measured value of a current transformer is obtained through conventional intelligent electronic devices (IEDs) and can be an analog signal or a digital signal. Conventional longitudinal current differential protection can be achieved through the IEDs after exchange is conducted on a longitudinal channel and opposite side information. Non-uniform re-quantization is conducted on the amplitude and the phase of a measuring current, the measured value formed by eight bytes is changed into an integer value formed by two bytes, new longitudinal differential protection can be achieved through the longitudinal channel on the basis of the newly quantized value, and wide area differential protection can also be achieved on the basis of wide area channels. According to the method, the communication traffic of the measured value can be reduced to a great extent through secondary data conversion, differential protection can be achieved when communication conditions are lowered during communication channel collapse, and constraints of wide area current differential protection on the communication traffic can be reduced; action features of differential protection are not reduced.

Description

technical field [0001] The invention belongs to the field of relay protection in power systems, in particular to a wide-area relay protection fault discrimination algorithm based on wide-area multi-source information. Background technique [0002] Wide-area relay protection makes full use of synchronous measurement information in a wide area to improve the performance of backup protection. Because of its advantages of simplifying setting value and improving the sensitivity and speed of backup protection, it has been extensively explored and researched by scholars. . However, wide-area relay protection relies on the distributed collection of information and remote communication, and the centralized processing of information causes defects such as large communication capacity and poor real-time performance. Therefore, the study of fault identification algorithms with low communication capacity while ensuring sensitivity and reliability is helpful to rationally utilize the exi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
Inventor 李振兴吴李群刘颖彤邱立张涛刘军江磊
Owner CHINA THREE GORGES UNIV
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