Hybrid DC transmission system with fault processing function

A hybrid DC and power transmission system technology, applied in emergency treatment of AC circuit layout, AC network voltage adjustment, electrical components, etc., can solve the fault that cannot be effectively dealt with on the DC side, the active power cannot be output to the AC side, and increase the commutation. Station construction cost and other issues, to achieve the effect of reliable and smooth crossing, maintaining voltage, and simple structure

Pending Publication Date: 2019-09-24
NR ELECTRIC CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] but figure 1 and figure 2 In the hybrid DC transmission system, when the DC transmission line has a flashover due to insulation degradation or a ground fault caused by tree branch collision, the DC system will short-circuit for a short time, the active power cannot be output to the AC side, and a huge DC fault current is generated. However , the existing modular multilevel converter DC power transmission system based on half-bridge sub-modules has a big defect: it cannot effectively deal with DC side faults, and the system reliability is low
The above solutions have greatly increased the construction cost of the converter station, and at the same time increased the loss of the DC system

Method used

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  • Hybrid DC transmission system with fault processing function
  • Hybrid DC transmission system with fault processing function
  • Hybrid DC transmission system with fault processing function

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Embodiment Construction

[0046] The technical scheme of the present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention.

[0047] A hybrid direct current transmission system with a fault handling function, comprising a hybrid direct current transmission system and a fault handling device, wherein the hybrid direct current transmission system includes a rectifier and converter station for connecting to an alternating current grid at a sending end, and a station for connecting to an alternating current grid at a receiving end An inverter converter station and a direct current transmission line for connecting the rectifier converter station and the inverter converter station, the inverter converter station is connected to the AC power grid at the receiving end through a tr...

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Abstract

The invention discloses a hybrid DC transmission system with a fault processing function, which comprises a hybrid DC transmission system and a fault processing device, wherein the fault processing device includes a blocking unit and a measuring unit, or includes a blocking unit and a bypass switch, or includes a blocking unit, a bypass switch and a knife switch assembly, or includes a blocking unit, a measuring unit and a bypass switch, or includes a blocking unit, a measuring unit, a bypass switch and a knife switch assembly. The hybrid DC transmission system is low in cost and loss, the flexible control of the hybrid DC transmission system can be realized through the bridging bypass switch and measuring unit, DC transmission line faults of the hybrid DC transmission system can be effectively processed without locking a converter, fast recovery of the DC power can be realized after the fault, and the safety of an AC-DC transmission system is better protected.

Description

technical field [0001] The invention belongs to the field of hybrid direct current transmission, and in particular relates to a hybrid direct current transmission system with a fault processing function. Background technique [0002] HVDC systems can be divided into two types: conventional DC transmission systems (LCC-HVDC) based on thyristor technology and flexible HVDC systems based on fully controlled power electronic device technology (Flexible-HVDC). Among them, the conventional direct current transmission system (LCC-HVDC) has low cost, low loss, and mature operation technology. The inverter side is prone to commutation failure, strong dependence on the AC system, absorbing a large amount of reactive power, and large area occupied by the converter station. The new generation of flexible direct current transmission system (Flexible-HVDC) can realize the decoupling control of active power and reactive power, can supply power to the passive network, has a compact structu...

Claims

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Application Information

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IPC IPC(8): H02H7/26H02J3/36H02J3/16
CPCH02H7/268H02J3/36H02J3/16H02J3/001Y02E40/30Y02E60/60
Inventor 赵文强王永平杨建明卢宇李海英
Owner NR ELECTRIC CO LTD
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