Method for high-voltage direct-current transmission commutation failure prevention

A high-voltage DC transmission and commutation failure technology, which is applied in the field of power transmission and distribution, can solve the problems of incomplete control and protection strategy research content and weak control and protection strategy research, so as to achieve excellent defense effect, prevent commutation failure, and reduce effect of magnitude

Inactive Publication Date: 2013-10-02
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +4
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

ABB, SIEMENS, etc. are the few companies in the world that can complete the design and manufacture of DC transmission control and protection systems. The control and protection systems currently used in China mainly adopt the schemes of the above two companies, and domestic research on control and protection strategies for HVDC system failures Relatively weak, the research content of the control and protection strategy for some specific faults is not complete

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  • Method for high-voltage direct-current transmission commutation failure prevention
  • Method for high-voltage direct-current transmission commutation failure prevention
  • Method for high-voltage direct-current transmission commutation failure prevention

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Embodiment Construction

[0041] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0042] Such as figure 1 A defense method for commutation failure of high-voltage direct current transmission is provided, the method comprising the following steps:

[0043] Step 1: Determine whether commutation failure caused by AC side fault occurs;

[0044] Step 2: The commutation failure defense system outputs a rectangular wave command to the control protection system;

[0045] Step 3: Subtract the rectangular wave from the trigger angle command of the control and protection system to trigger the thyristor in advance.

[0046] The step 1 includes the following steps:

[0047] Step 1-1: Measure the AC voltage u of phase A, B and C on the inverter side a , u b and u c ;

[0048] Step 1-2: Calculate the zero-sequence voltage u of the commutated bus voltage 0 , the corresponding α-component u of the phase voltage vector on the α-axis and β-axis on th...

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Abstract

The invention provides a method for high-voltage direct-current transmission commutation failure prevention. The method comprises the following steps that: whether commutation failure caused by alternating current-side faults occurs or not is judged; a commutation failure prevention system outputs rectangular wave commands to a control protection system; and rectangular waves are subtracted from trigger angle commands in the control protection system, and a thyristor is triggered in advance. With the method adopted, commutation failure can be prevented when grounding faults or interphase short-circuit faults occur on an alternating current system, and the reduction amplitude of direct-current voltage and power transmission can be lowered after the faults occur.

Description

technical field [0001] The invention belongs to the technical field of power transmission and distribution, and in particular relates to a defense method for commutation failure of high-voltage direct current transmission. Background technique [0002] After the thyristor valve period in the 1970s and 1980s, power electronics technology has greatly developed DC transmission, and has shown more advantages in the interconnection of large power grids. The traditional pure AC power grid has developed into an AC-DC hybrid power grid; Conventional power grid commutation HVDC (Line-Commutated-Converter High Voltage Direct Current, LCC-HVDC) with thyristors as commutation components has gained rapid worldwide popularity due to its large-capacity, long-distance power transmission, fast and controllable active power, etc. development of. [0003] The commutation failure (CF) of the converter station and the fault of the DC line are relatively common fault forms of the DC system. Whe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36
CPCY02E60/60
Inventor 刘济豪刘文静许韦华阳岳希赵成勇郭春义
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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