A Fault Location Method for Photovoltaic DC Transmission System Based on Boundary Resonance Identification
A technology of system fault and ranging method, which is applied in fault location, information technology support system, fault detection according to conductor type, etc., can solve problems such as large influence of distributed capacitive current, long extraction time, high pressure of data transmission, etc. Achieve the effect of less pressure on data storage and transmission
Active Publication Date: 2021-05-25
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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[0003] However, the current research on fault location methods for flexible DC lines is mainly carried out in the time domain and frequency domain. The fault location method based on time domain fault information is less sensitive to high-resistance faults; the fault location method based on frequency domain information The method needs to extract multi-band high-frequency quantities, the extraction time is long, the pressure of data transmission is high, and it is also greatly affected by the distributed capacitive current
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[0053] In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below in conjunction with the drawings in the embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of the invention. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0054] Such as figure 1As shown, after the photovoltaic power genera...
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The invention discloses a fault location method for a photovoltaic DC sending system based on boundary resonance identification. The fault location method includes the following steps: Step 1: Analyze the system frequency when a bipolar short-circuit fault occurs in a collection branch or a sending branch. The fault component loop in the domain; Step 2: According to the analysis results of Step 1, the relationship between the resonant current and the fault distance is obtained by using the characteristics of the full-frequency domain information of the DC fault interpole voltage and the series resonance formed by the branch boundary elements, and Form the ranging equation; Step 3: Use the continuous wavelet transform algorithm to extract the resonant current of each branch; Step 4: Substituting the resonant current extracted in Step 3 into the ranging equation in Step 2 to calculate the fault distance and complete the fault location.
Description
technical field [0001] The invention relates to the technical field of grid-connected new energy power generation, in particular to a fault location method for a photovoltaic DC transmission system based on boundary resonance identification. Background technique [0002] With the increasing maturity of DC transmission technology, the scale of the photovoltaic industry continues to grow. As an important form of photovoltaic power generation transmission in the future, the photovoltaic DC boost collection and transmission system has attracted great attention from scholars at home and abroad. Photovoltaics avoid the line loss caused by AC transmission through local DC boosting, collection and transmission, and there is no stability problem caused by parallel connection of multiple inverters. Fast and reliable fault location technology is the guarantee for the rapid recovery of photovoltaic power generation system after failure. Therefore, fault location technology plays an imp...
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IPC IPC(8): G01R31/52G01R31/08
CPCG01R31/085Y04S10/52
Inventor 贾科施志明王聪博陈聪陈淼毕天姝朱瑞
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)