Direct-current circuit breaker and application method thereof
A technology of DC circuit breaker and application method, which is applied in the direction of emergency protection circuit devices, electrical components, etc., and achieves the effects of good technical performance, low-cost expansion, and high-tech economy
Pending Publication Date: 2022-04-05
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +1
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Problems solved by technology
[0004] In view of this, the embodiment of the present invention provides a DC circuit breaker and its application method to solve the problem that existing hybrid DC circuit breakers or mechanical DC circuit breakers are difficult to meet the technical and economical requirements of large-scale DC power grid construction at the same time. Technical issues with double requirements
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[0031] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0032] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, ...
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The invention discloses a direct current circuit breaker and an application method thereof, the direct current circuit breaker comprises a voltage source excitation oscillation unit, an energy absorption unit, a plurality of mechanical switch units and a plurality of isolation units, the plurality of mechanical switch units are respectively arranged on a plurality of direct current lines, the input ends of the plurality of isolation units are respectively connected with the plurality of direct-current lines in a one-to-one correspondence manner, the output ends of the plurality of isolation units are connected with one end of the voltage source excitation oscillation unit and one end of the energy absorption unit, and the other end of the voltage source excitation oscillation unit and the other end of the energy absorption unit are connected with a direct-current bus of the direct-current lines. According to the invention, all direct-current lines share the voltage source excitation oscillation unit and the energy absorption unit of the direct-current circuit breaker, so that flexible, simple and low-cost expansion along with the increase of the direct-current lines is realized; the overall arrangement and design of the converter station are facilitated; and meanwhile, the equipment cost applied to a high-voltage large-capacity direct-current power grid is remarkably reduced, and high technical economy is achieved.
Description
technical field [0001] The invention relates to the technical field of power electronics, in particular to a DC circuit breaker and an application method thereof. Background technique [0002] Faults in DC transmission and distribution systems develop rapidly and the current increases rapidly. Reliable fault isolation is the key to ensure its safe and stable operation. High-tech and economical DC circuit breakers are the core equipment supporting the development and application of DC power transmission and distribution systems. At present, there are mainly two types of medium and high-voltage DC circuit breakers that are widely used. One is the mechanical DC circuit breaker, which realizes the arc-off and shutdown of the mechanical switch through a single injection of reverse current. The loss is low, but the required capacitance is large. The voltage is high, and there is a long reclosing time and the risk of restarting the mechanical switch that is broken by a small curre...
Claims
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IPC IPC(8): H02H7/26
Inventor 刘远周万迪贺之渊张升高冲李弸智
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD