Self-adaptive fault current limiter

Abstract

The invention discloses a self-adaptive fault current limiter. The self-adaptive fault current limiter comprises a superconducting fault current limiting resistor RSFCL and a thyristor T1 which are connected in series between a port 1 and a port 2; the anode of the thyristor T1 is connected with a superconducting fault current-limiting resistor RSFCL, and the cathode of the thyristor T1 is connected with a port 2. The current limiter also comprises a coupling inductor which comprises an inductance winding L1 and an inductance winding L2 which have a mutual inductance effect; the inductance winding L2 is connected in series with a capacitor C and then is connected between the port 1 and the port 2; the dotted terminal of the inductance winding L2 is connected with the port 1, the synonym terminal is connected with one end of the capacitor C, and the other end of the capacitor C is connected with the port 2; the inductance winding L1 is connected in series with a current-limiting resistor R and then connected in parallel to two ends of the thyristor T1; the synonym end of the inductance winding L1 is connected with the anode of the thyristor T1, the dotted end of the inductance winding L1 is connected with one end of the current-limiting resistor, and the other end of the current-limiting resistor is connected to the cathode of the thyristor T1. According to the invention, the on-state loss is low, the current-limiting resistor and the inductor can be automatically connected in series into a line when a short-circuit fault occurs, and the short-circuit fault current can be effectively suppressed and reduced.

Description

technical field [0001] The invention relates to the technical field of electrical equipment and electrical engineering, in particular to an adaptive fault current limiter. Background technique [0002] In recent years, with the country's emphasis on environmental protection and the gradual depletion of non-renewable energy such as coal and oil in the world, the country has increased the development and utilization of renewable clean energy. Clean energy projects such as offshore wind power generation in coastal areas and solar power generation in the west are being steadily constructed in China, and the best way for these distributed energy sources to carry out long-distance power transmission is high-voltage direct current transmission. However, due to the low line impedance of the DC transmission system, when a short-circuit fault occurs on the line, the fault current rises rapidly and has a high amplitude, so the design of the HVDC circuit breaker has become one of the ma...

AI Technical Summary

Problems solved by technology

[0004] The research on the DC fault current limiter is still in its infancy, the on-state loss of the fault current limiter, the cut-in problem of the fault current limiter when a short-circuit fault occurs, and the problem of its ability to limit the fault current have not been effectively solved and simultaneously take into account

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