Direct-current line single-terminal fault location method for multiterminal flexible direct-current transmission system
A technology for DC transmission systems and DC lines, which is applied to fault locations and uses pulse reflection method to detect faults, etc., to achieve the effects of obvious distributed parameter characteristics, easy detection, and stable transient characteristic frequency energy.
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[0026] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0027] see figure 1 As shown, large capacitors are connected in parallel on both sides of the DC transmission line of the multi-terminal flexible DC transmission system. This system structure makes the traveling wave at high frequency fully reflected on the system side. When a metallic fault occurs, the traveling wave is also totally reflected at the fault point, and the energy of the traveling wave will attenuate to a certain extent when the transition resistance increases. On the other hand, the DC line is generally long, and the distribution parameter characteristics are obvious. The reflection at the end makes the propagation delay of the traveling wave between the system side and the fault point fixed, and it appears in the form of characteristic frequency in the frequency domain. This characteristic frequency is inversely proportional to the fault dist...
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