A flexible direct current transmission system and its fault recovery method
A technology for fault recovery and power transmission systems, applied in the direction of emergency treatment AC circuit layout, power transmission AC network, etc., can solve problems such as inability to isolate faults and fast recovery, achieve good application prospects, simple fault recovery process, and simple and reliable methods Effect
Active Publication Date: 2018-08-17
NR ELECTRIC CO LTD +3
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- Abstract
- Description
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Problems solved by technology
[0004] The purpose of the present invention is to overcome the problem that the existing flexible direct current transmission system cannot isolate the fault and recover quickly when a short-circuit fault occurs
Method used
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Embodiment Construction
[0021] The present invention will be further described below in conjunction with the accompanying drawings.
[0022] The flexible direct current transmission system of the present invention includes a plurality of converter stations, and each converter station is connected with one or more direct current lines, and one or both sides of the direct current lines are equipped with series-connected direct current circuit breakers and fault recovery units. The DC circuit breaker is used to realize the connection or disconnection of the DC line and the converter station, and the fault recovery unit is used to avoid the voltage oscillation and overvoltage faults of the empty-charged DC line, and reduce the failure of the DC line during the fault recovery process. disturbances, including resistors in parallel with mechanical switches.
[0023] When any DC line is running normally, the mechanical switch in the fault recovery unit on the DC line is in the closed position, and when the D...
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The invention discloses a flexible direct current power transmission system and a fault recovery method thereof. The flexible direct current power transmission system comprises a plurality of converter stations, wherein each converter station is connected with one or multiple direct current lines; a direct current circuit breaker and a fault recovery unit which are connected in series with each other are arranged on one side or two sides of the direct current lines; and the fault recovery units comprise resistors and mechanical switches which are connected in parallel. According to the flexible direct current power transmission system, by the arrangement of the direct current circuit breakers and the fault recovery units on the direct current lines, when a certain direct current line has faults and is needed to be put into operation, the corresponding fault recovery unit enables the line to be controlled to be charged, so that the phenomenon of over-voltage of voltage oscillation caused by empty charging of the direct current line is effectively avoided, and the disturbance in a direct current line fault recovery process is reduced; the system is simple in structure; the method is simple and reliable; the fault recovery process is simple and effective; and the flexible direct current power transmission system is applicable to engineering application and has good application prospects.
Description
technical field [0001] The invention relates to the technical field of flexible direct current transmission in power systems, in particular to a flexible direct current transmission system and a fault recovery method thereof. Background technique [0002] Recently, with the depletion of fossil energy and the increasing pressure to improve the environment, China and the world are facing a strategic adjustment of energy structure, large-scale development and utilization of new energy is imperative. Flexible DC transmission uses a voltage source converter, which can independently and quickly control active power and reactive power, thereby improving the stability of the flexible DC transmission system, suppressing fluctuations in frequency and voltage of the flexible DC transmission system, and improving the efficiency of new energy sources. Steady-state performance of grid-connected AC power generation systems. [0003] With the development of flexible DC transmission to high...
Claims
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IPC IPC(8): H02J3/36
CPCH02J3/001H02J3/36Y02E60/60
Inventor 汪楠楠田杰卢宇董云龙姜崇学李钢王辉鲁江邹晓峰徐洁
Owner NR ELECTRIC CO LTD