Photovoltaic direct-current sending-out system fault distance measurement method based on boundary resonance identification
A technology of system fault and distance measurement method, applied in fault location, information technology support system, fault detection according to conductor type, etc., can solve the problem of high resistance fault, low sensitivity, long extraction time, large influence of distributed capacitance current, etc. question
Active Publication Date: 2020-06-16
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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[0052] 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.
[0053] Such as figure 1 As shown, after the photovoltaic power gener...
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The invention discloses a photovoltaic direct-current sending-out system fault distance measurement method based on boundary resonance identification. The photovoltaic direct-current sending-out system fault distance measurement method comprises the following steps of: 1, analyzing a fault component loop of a system frequency domain when a bipolar short-circuit fault happens to a collection branchor a sending-out branch; 2, according to an analysis result of the step 1, acquiring a relationship between a resonance current and a fault distance by utilizing the characteristics that a direct current fault inter-electrode voltage contains full-frequency domain information and series resonance formed by branch boundary elements, and forming a distance measurement equation; 3, extracting resonance current of each branch by using a continuous wavelet transform algorithm; 4, and substituting the resonance current extracted in the step 3 into the distance measurement equation in the step 2, calculating a fault distance, and completing fault distance measurement.
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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Login to View More 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)