Short-circuit current limiter with high reliability and method thereof
A short-circuit current and reliability technology, applied in the field of short-circuit current limiters, can solve the problems of unreliability, complicated DC circuit control methods, and insufficient comprehensive performance and effects, and achieves high operational reliability, convenient use, and simple control methods. Effect
Inactive Publication Date: 2014-01-15
SHANDONG UNIV
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Problems solved by technology
Saturable reactance-type short-circuit current limiter is an important research direction. US patents USPO4031457, 4122385, 4152637, 20090021875A1; Chinese patent 2004100802846 "a fault current limiter" are all saturated reactance-type short-circuit current limiters, and these inventions have their own characteristics. , but the overall performance and effect are not good enough
In particular, DC circuits and their control methods are complex and unreliable
Method used
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[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0027] The structure and connection method of a thyristor-controlled short-circuit current limiter are as follows: figure 1 shown. A thyristor-controlled short-circuit current limiter has a saturable reactor 6, and the saturable reactor 6 has four terminals, AC coil group terminal I1, AC coil group terminal II2, DC coil group terminal I3, DC coil group terminal II4; Coil group terminal I1 and AC coil group terminal II2 are connected to the internal AC coil group of the saturable reactor to provide an AC current path; DC coil group terminal I3 and DC coil group terminal II4 are connected to the internal DC coil group of the saturable reactor to provide a DC current path; The coil group and the DC coil group interact through the closed-loop iron core 9 inside the saturable reactor; a set of full-bridge rectification circuit composed of diode D1, diode D2...
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The invention relates to a short-circuit current limiter with high reliability and a short-circuit current limiting method thereof. The limiter has relatively higher overall performance, a simple direct current circuit and a simple control method thereof, and high reliability. The limiter comprises a saturable reactor iron core. An alternating current coil unit and a direct current coil unit are arranged on the iron core. One end of the alternating current coil unit is connected with one input end of a rectification circuit, and the other end of the alternating current coil unit and another input end of the rectification circuit are connected with an external circuit. The output end of the rectification circuit is connected in series with the direct current coil unit to form a direct current loop. Two thyristors are reversely connected in parallel between the input ends of the rectification circuit. Two input terminals of a control module are connected with the two ends of each thyristor, and the other two input terminals of the control module are connected with two terminals of the alternating current coil unit by a voltage transformer. Two output terminals of the control module are connected with the triggering ends of the two thyristors respectively, and control the on-state of the two thyristors.
Description
technical field [0001] The invention relates to the technical field of power transmission and transformation in power systems, in particular to a short-circuit current limiter with high reliability and a method thereof. Background technique [0002] With the continuous development of the power system and the continuous increase of power generation capacity, the short circuit current caused by the short circuit of the power system is very large. The short circuit current caused by the short circuit in the power system is very harmful to the power system. Therefore, reducing the short-circuit current can reduce the damage degree of the power equipment during short-circuit and improve the stability of the power system. [0003] In recent years, research on methods and devices for limiting short-circuit current (also known as short-circuit current limiters) has become a hot topic. [0004] Many new principles of short-circuit current limiter have been proposed, but there are v...
Claims
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IPC IPC(8): H02H9/02
Inventor 李晓明
Owner SHANDONG UNIV