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A fault processing device and fault processing method for a hybrid direct current transmission system

A hybrid DC power transmission and power transmission system technology, applied to emergency protection circuit devices, information technology support systems, electrical components, etc., can solve the problems of long restart recovery time, unfavorable transient stability of AC and DC power transmission systems, etc., and achieve simple structure, The effect of maintaining voltage and protecting equipment safety

Active Publication Date: 2019-06-21
NR ELECTRIC CO LTD +1
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  • Application Information

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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 DC transmission system uses a voltage source converter and one end uses a thyristor converter, when the DC transmission line of the hybrid DC transmission system fails, the general thyristor converter adopts the processing method of the conventional DC transmission system, and the voltage source The type converter adopts the processing method of the flexible DC transmission system, so the restart 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 transient stability of the AC-DC transmission system

Method used

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  • A fault processing device and fault processing method for a hybrid direct current transmission system
  • A fault processing device and fault processing method for a hybrid direct current transmission system
  • A fault processing device and fault processing method for a hybrid direct current transmission system

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Embodiment Construction

[0035] The technical solutions and beneficial effects of the present invention will be described in detail below with reference to the accompanying drawings.

[0036]The present invention provides a fault handling device for a hybrid DC power transmission system, wherein the hybrid DC power transmission system includes a rectifier and converter station for connecting to the sending-end AC power grid, an inverter and converter station for connecting to the receiving-end AC power grid, and a A DC transmission line connecting the rectifier and converter station and the inverter converter station, the inverter converter station is connected to the AC power grid at the receiving end through a transformer, the rectifier converter station includes at least one group of voltage source converter units, the inverter converter The station includes at least one set of thyristor converter units.

[0037] The rectifier-converter station adopts a voltage source converter based on fully-contr...

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Abstract

The invention discloses a hybrid DC transmission system fault handling device, which comprises an acquisition unit, a fault identification unit and a fault handling unit. The invention also disclosesa hybrid DC transmission system fault handling method. The DC voltage and the DC of the hybrid DC transmission system, the AC voltage of an AC power grid connected with an inverter converter station and a rectifier converter station and the voltage of a submodule capacitor of a voltage source converter in the rectifier converter station are acquired; whether the hybrid DC transmission system failsis identified; and if fault happens, the rectifier converter station is controlled to switch a DC instruction value and / or a DC voltage instruction value, and the inverter converter station is controlled to switch a trigger angle instruction value. Due to the above technical scheme, the DC transmission line fault in the hybrid DC transmission system can be effectively handled in a condition in which the converter is not locked, 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 power transmission, and particularly relates to a fault processing device and a fault processing method of a hybrid direct current power transmission system. Background technique [0002] HVDC transmission systems can be divided into two types: conventional direct current transmission system based on thyristor technology (LCC-HVDC) and flexible direct current transmission system 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. At present, almost all the DC transmission systems in operation in the world are LCC-HVDC systems, but conventional direct current transmission systems (LCC-HVDC) exist. The inverter side is prone to commutation failure, has strong dependence on the AC system, absorbs a large amount of reactive power, and the conv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26H02J3/36
CPCH02H7/268H02J3/36Y02E60/60Y04S10/52
Inventor 赵文强王永平杨建明卢宇俞翔王俊生
Owner NR ELECTRIC CO LTD
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