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Fault handling device and method for hybrid DC transmission system with fault restart function

A hybrid DC and power transmission system technology, applied in the direction of circuit devices, emergency protection circuit devices, emergency protection devices with automatic disconnection, etc., can solve the problems of long restart recovery time, unfavorable transient stability of AC and DC transmission systems, etc., and achieve structural Simplicity, safety protection, and the effect of protecting equipment safety

Inactive Publication Date: 2018-07-06
NR ELECTRIC CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the DC line fault disappears, the converters on the rectification and inverter sides will first close the DC side switch, then re-close the AC side circuit breaker for pre-charging, and finally restore the power of the DC system, so that the entire system can be restarted and restored The time is long, usually at the second level, which is not conducive to the transient stability of the AC-DC transmission system
Since at least one end of the hybrid HVDC system uses a flexible HVDC converter and the other end uses a conventional HVDC converter, when the HVDC line fails, one end of the HVDC system generally adopts a conventional HVDC converter. The processing method of the system adopts the processing method of the flexible DC transmission system at one end of the flexible DC transmission converter, so the restart and recovery time of the entire hybrid DC transmission system is also relatively long, usually on the order of seconds, which is not conducive to the temporary maintenance of the AC-DC transmission system. State stable

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  • Fault handling device and method for hybrid DC transmission system with fault restart function
  • Fault handling device and method for hybrid DC transmission system with fault restart function
  • Fault handling device and method for hybrid DC transmission system with fault restart function

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Embodiment Construction

[0039] The technical solutions and beneficial effects of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0040] The present invention provides a hybrid direct current transmission system fault processing device with a fault restart function, wherein the hybrid direct current transmission system includes a rectifier and converter station for connecting to the AC power grid at the sending end, and an inverse conversion station for connecting to the AC power grid at the receiving end A rectifier station and a direct current transmission line for connecting the rectification converter station and the inverter converter station. The thyristor converter unit, the other includes at least one set of current source converter units based on fully controlled power electronic devices (hereinafter referred to as: fully controlled current source converter).

[0041] Generally, the rectifier converter station adopts a converter based o...

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Abstract

The invention discloses a fault handling device for a hybrid DC transmission system with a fault restart function, which comprises an acquisition unit, a fault identification unit and a fault handlingunit. The invention also discloses a fault handling method. The DC voltage and the DC of the hybrid DC transmission system and the AC voltage and the AC of an AC power grid connected with a rectifierconverter station and an inverter converter station are acquired; whether the hybrid DC transmission system fails is identified according to the acquired analog; and if fault happens, a thyristor converter is controlled to switch a trigger angle instruction value, and a current source-type converter based on a fully-controlled power electronic device is controlled to switch a DC instruction valueand / or a DC voltage instruction value. the above technical scheme can effectively handle the DC transmission line fault of the hybrid DC transmission system, reliable fault ride through can be realized, fast DC power recovery after the fault disappears can be realized, the stability of the AC / DC transmission system can be better maintained, and the safety of the AC / DC transmission system is protected.

Description

technical field [0001] The invention belongs to the field of hybrid direct current transmission, and in particular relates to a fault processing device and a fault processing method of a hybrid direct current transmission system with a fault restart 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 su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02H7/26H02H3/087H02H3/06
CPCH02H3/066H02H3/087H02H7/268H02J3/36Y02E60/60
Inventor 赵文强王永平杨建明俞翔鲁江卢宇李海英
Owner NR ELECTRIC CO LTD
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