Identification method for faults in and out of area of high voltage direct current (HVDC) transmission line based on multi-fractal spectrum
A multi-fractal spectrum, high-voltage DC technology, applied in fault locations, information technology support systems, etc., can solve problems such as noise interference, refusal of traveling wave protection devices, and reduction in the rate of change of traveling wave protection voltages.
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0049] Embodiment 1: as figure 1 As shown, this multi-fractal spectrum-based fault identification method for high-voltage direct current transmission lines inside and outside the area is used in the Yunguang ±800kV direct current transmission system. The power transmission capacity of the system is 5000MW, and the reactive power compensation capacity of the rectification side and the inverter side are 3000Mvar and 3040Mvar respectively; each pole commutation unit is composed of two 12-pulse converters in series, and the DC transmission line is a six-split conductor with a total length of Take it as 1500km, using the J.R.Marti frequency correlation model; 400mH smoothing reactors are installed on both sides of the line; F 2 , F 3 is an out-of-area fault, F 1 , F 4 is the fault in the area, and M is the place where the protection is installed.
[0050] Such as figure 2 As shown, the physical boundaries of the DC transmission system are composed of smoothing reactors and D...
Embodiment 2
[0070] Embodiment 2: as figure 1 , 2 As shown, this multi-fractal spectrum-based fault identification method for high-voltage direct current transmission lines inside and outside the area is carried out in the Yunguang ±800kV direct current transmission system, and the structure and related parameters of the transmission system are the same as those in embodiment 1.
[0071] At a distance of 150km from the protection installation, a positive ground fault occurs in 0.505s, and the transition resistance is 10Ω. By the same method as in Example 1, the same sampling frequency 、 The length of the sampling time window and the length of the sampling sequence to find the fault component of the line-mode voltage waveform like Figure 5 As shown, the singularity index multifractal spectrum of Such as Figure 7 shown; get the minimum value of the singularity index =0.7902, maximum value =1.3230, singularity exponent growth rate k =0.6743.
[0072] The resulting singularit...
PUM
Abstract
Description
Claims
Application Information
- R&D Engineer
- R&D Manager
- IP Professional
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com