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Control method and device of hybrid cascade direct current power transmission system and electronic equipment

A technology of DC transmission system and hybrid cascading, which is applied in the direction of emergency protection circuit devices, circuit devices, emergency protection circuit devices, etc. for limiting overcurrent/overvoltage, so as to relieve DC overvoltage, reduce input frequency and increase usage The effect of longevity

Active Publication Date: 2021-07-23
NR ELECTRIC CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When a fault occurs, switching on the DC energy consumption device can suppress the DC overvoltage during the fault, and frequent switching on and off of the energy consumption device may cause damage to the energy consumption device
[0004] The invention provides a DC overvoltage control method and control system for an AC fault in a hybrid cascaded DC system, which can alleviate the DC overvoltage problem during a fault on the basis of fully utilizing the power transmission capacity of the converter

Method used

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  • Control method and device of hybrid cascade direct current power transmission system and electronic equipment
  • Control method and device of hybrid cascade direct current power transmission system and electronic equipment
  • Control method and device of hybrid cascade direct current power transmission system and electronic equipment

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Embodiment Construction

[0040]Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this application will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals denote the same or similar parts in the drawings, and thus their repeated descriptions will be omitted.

[0041] The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided in order to give a thorough understanding of embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced without one or more of these s...

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Abstract

The invention relates to the field of high-voltage power transmission, in particular to a control method of a hybrid cascade direct-current power transmission system. The hybrid cascade direct-current power transmission system comprises a rectifier station and an inverter station, wherein the inverter station comprises a plurality of voltage source type converters connected in parallel. The method comprises the steps of obtaining a voltage effective value of the alternating-current side of each voltage source type converter; judging whether the voltage source type current converter breaks down or not based on the voltage effective value; and if the voltage source type current converter breaks down, controlling at least one of the voltage source type current converters which work normally to carry out power compensation.

Description

technical field [0001] The present application relates to the field of high-voltage power transmission, and in particular to a control method, device and electronic equipment for a hybrid cascaded direct current transmission system. Background technique [0002] The DC transmission project is divided into the rectification side and the inverter side. The conventional DC transmission system (LCC-HVDC) based on the commutation converter of the grid has the advantages of small loss, low cost, and mature operation technology, but at the same time, the inverter side is prone to Commutation failure, strong dependence on the AC system, absorption of a large amount of reactive power and other deficiencies. The flexible direct current transmission system (VSC-HVDC) based on the voltage source converter has the advantages of no commutation failure, active power and reactive power decoupling control, passive operation, and compact structure. When all VSC converters are used on the inv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02H9/04
CPCH02J3/36H02H9/045Y02E60/60
Inventor 常昊添王柯随顺科姜崇学董云龙卢宇赵文强侍乔明田杰李海英
Owner NR ELECTRIC CO LTD