Hybrid DC power transmission line single-end fault distance measurement method and system

A fault location and transmission line technology, applied in the fault location and other directions, can solve the problem of inaccurate location of the fault location method, and achieve the effects of reliable ranging results, high precision, strong adaptability and robustness

Active Publication Date: 2022-03-15
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a hybrid direct current transmission line single-end fault loca

Method used

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  • Hybrid DC power transmission line single-end fault distance measurement method and system
  • Hybrid DC power transmission line single-end fault distance measurement method and system
  • Hybrid DC power transmission line single-end fault distance measurement method and system

Examples

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Comparison scheme
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Example Embodiment

[0083] Example 1: Such as figure 1 As shown, a single-end fault ranging method for mixed DC transmission lines is:

[0084] Step1: Collect line single-end line wave coupling current signal, get ranging signals, such as figure 2 As shown, the steps are included.

[0085] STEP1.1: Collect line single-end row wave coupling current signal.

[0086] Step1.2: Decoupting the obtained row-wave coupling current signal, and obtains the electrode space modulus current signal.

[0087] Step1.3: Calculate the power signal of the extreme spatial modulus current signal to construct the ranging signal.

[0088] The power signal refers to a volatility power converting to a pole space modulus current signal.

[0089] Step2: Calculate the spectrum of the single-end ranging signal, the determination frequency difference stability value exists, if, then automatically adjust the length of the data window, return to recalculate the single-ended spectrum. If so, the frequency difference is used to make a...

Example Embodiment

[0140] Example 2, it is assumed that a bipolar metallic short-circuit fault occurs at 300 km from the M-terminal, the sampling rate is 200 kHz, and the ranging is performed by the method of the present invention, and the specific steps are:

[0141] Step1: Acquisition of line single-end row coupling box current signal, acquires ranging signal, specific steps:

[0142] STEP1.1: Collection line single-end line wave coupling box current signal I M ,Such as Figure 9 Indicated.

[0143] Step1.2: Computing Signal I M Three power signals, constructed ranging signals.

[0144] The power signal refers to a volatility power converting to a pole space modulus current signal.

[0145] Step2: Calculate the spectrum of the single-end ranging signal, the determination frequency difference stability value exists, if, then automatically adjust the length of the data window, return to recalculate the single-ended spectrum. If so, the frequency difference is used to make a fault distance, change At ...

Example Embodiment

[0159] Example 3: Assuming that a bipolar metallic short-circuit fault occurs at 300km from the M-terminal, the sample rate is 200 kHz. The specific implementation step of realizing the ranging from the N-terminal single-ended data using the inverter side N-terminal is:

[0160] Step1: Acquisition of line single-end row coupling box current signal, acquires ranging signal, specific steps:

[0161] STEP1.1: Collection line single-end line wave coupling box current signal I N ,Such as Figure 12 Indicated.

[0162] Step1.2: Computing Signal I N Three power signals, constructed ranging signals.

[0163] The power signal refers to a volatility power converting to a pole space modulus current signal.

[0164] Step2: Calculate the spectrum of the single-end ranging signal, the determination frequency difference stability value exists, if, then automatically adjust the length of the data window, return to recalculate the single-ended spectrum. If so, the frequency difference is used to ma...

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Abstract

The invention relates to a hybrid direct current transmission line single-end fault distance measurement method and system, and belongs to the technical field of power system relay protection control. The method comprises the following steps: collecting a line single-end traveling wave coupling box current signal to obtain a ranging signal; calculating the frequency spectrum of a single-end ranging signal, judging whether a frequency difference stable value exists or not, if not, automatically adjusting the length of a data time window, returning to recalculate the single-end frequency spectrum, and if yes, performing fault ranging by using the frequency difference and changing the length of the time window for at least three times to obtain at most two ranging estimation results kn% which exist stably, n = 1, 2; calculating a single-end verification signal, and respectively calculating the deviation delta n% between the distance measurement estimation result and the verification signal, n = 1, 2; the deviation delta n% is compared with a verification threshold value, whether delta n% is smaller than or equal to a preset verification threshold value or not is judged, if yes, the distance measurement result is kn%, and if not, the distance measurement result is 1-kn%. The method is suitable for various complex working conditions of the hybrid direct current system, the distance measurement result is high in accuracy, high in reliability and high in robustness.

Description

technical field [0001] The invention relates to a method and system for single-end fault distance measurement of a hybrid direct current transmission line, belonging to the technical field of relay protection control of a power system. Background technique [0002] Due to its advantages in long-distance large-capacity power transmission and grid interconnection, the proportion of high-voltage direct current (HVDC) in long-distance power transmission projects is increasing year by year. The traditional high-voltage direct current transmission (LCC-HVDC) technology based on phase-controlled converters has matured. It has the advantages of large transmission capacity, low cost, and mature operation technology. Therefore, the phase-controlled converter (LCC) is an important means to solve the problem of long-distance power transmission and grid interconnection. However, when LCC is used as an inverter, there are the following problems: first, there is a risk of commutation fail...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/08Y04S10/52
Inventor 束洪春安娜杨竞及韩一鸣唐玉涛代月单节杉曹璞璘董俊田鑫萃张广斌
Owner KUNMING UNIV OF SCI & TECH
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