Protection algorithm of power distribution network fault current limiter

A technology of current limiter and power distribution network fault, applied in the field of power system, can solve the problems of large influence of attenuated DC component, long calculation time, low calculation accuracy, etc., to achieve high reliability requirements, high accuracy, and reduce calculation time Effect

Inactive Publication Date: 2019-07-23
HARBIN UNIV OF SCI & TECH
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Problems solved by technology

[0004] Aiming at the defects of existing algorithms such as large influence of attenuating DC components, long calculation time and low calculation precision, the present invention provid

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  • Protection algorithm of power distribution network fault current limiter
  • Protection algorithm of power distribution network fault current limiter
  • Protection algorithm of power distribution network fault current limiter

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Example Embodiment

[0060] Example 1

[0061] Combine Figure 1-Figure 3 This embodiment is described. In this embodiment, a protection algorithm for a fault current limiter of a distribution network involved in this embodiment includes the following steps:

[0062] Step 1: Establish a power transmission line model of the distribution network, and establish a MATLAB simulation model based on the power transmission line model of the distribution network; collect current signals on the transmission line of the distribution network in real time;

[0063] Step 2: Select the corresponding protection algorithm based on the collected current signal type, process the sampled data, and calculate the measured value;

[0064] Step three, the measured value I m Compare with the setting value I, if I m >>I, that is, when a short-circuit fault occurs, the start current limiter limits the short-circuit current.

[0065] The signal acquisition device collects the current signal from the line in real time, and uses the cor...

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Abstract

The invention discloses a protection algorithm of a power distribution network fault current limiter, belongs to the technical field of power systems, and particularly relates to the protection algorithm of the power distribution network fault current limiter. The invention provides the protection algorithm of the power distribution network fault current limiter, which can effectively filter an attenuated direct current component, and is short in calculation time and high in calculation precision, aiming at overcoming the defects that the existing algorithm is large in influence of attenuateddirect current component, long in calculation time and low in calculation precision. The algorithm comprises the steps of establishing a power distribution network power transmission line model, and establishing an MATLAB simulation model according to the power distribution network power transmission line model; acquiring current signals on a power distribution network power transmission line in real time; selecting a corresponding protection algorithm according to the type of the acquired current signal, processing the sampled data, and calculating a measured value; and comparing the measuredvalue with the set value, and starting a current limiter to limit the short-circuit current. The algorithm is mainly used for controlling the current limiter.

Description

technical field [0001] The invention belongs to the technical field of power systems, and in particular relates to a protection algorithm for a distribution network fault current limiter. Background technique [0002] With the continuous expansion of the scale of the power system and the gradual strengthening of the power grid, the level of short-circuit current in the power system has been increasing year by year. The strong short-circuit current has higher requirements on the dynamic and thermal stability of the circuit, equipment and the switch itself, the system capacity continues to increase, the short-circuit capacity and short-circuit current also continue to rise, and the opening capacity of the fuse or circuit breaker is infinitely improved and unlimited It is very uneconomical or even impossible to improve the dynamic and thermal stability of lines and equipment to a high degree, and the limit breaking times of fuses are very limited. In order to limit the short-c...

Claims

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Application Information

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IPC IPC(8): H02H9/02G01R19/165
CPCG01R19/16528H02H9/02
Inventor 朱东柏陈莉娟梁迪
Owner HARBIN UNIV OF SCI & TECH
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