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HVDC continuous commutation failure inhibition method based on self-adaptive current deviation control

A technology of current deviation and commutation failure, applied in power transmission AC network, output power conversion device, AC power input into DC power output and other directions, can solve the problem of slow response, low sensitivity, inverter side voltage and DC The transmission power adjustment is slow and other problems, so as to reduce the possibility, improve the sensitivity, and avoid continuous commutation failure.

Active Publication Date: 2018-09-28
STATE GRID HUNAN ELECTRIC POWER +1
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the sensitivity of traditional CEC is not high. When a serious three-phase or single-phase fault occurs in the system, its response is slow, and the inverter side voltage and DC transmission power are adjusted slowly, making it difficult to avoid continuous commutation failures in the system.

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  • HVDC continuous commutation failure inhibition method based on self-adaptive current deviation control
  • HVDC continuous commutation failure inhibition method based on self-adaptive current deviation control
  • HVDC continuous commutation failure inhibition method based on self-adaptive current deviation control

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Embodiment Construction

[0047] The traditional current deviation control characteristic is linear, so when a serious fault occurs in the system, its dynamic response is slow, resulting in slow adjustment of the inverter side voltage and DC transmission power, and it is difficult to avoid continuous commutation failure in the system. Therefore, by detecting the voltage drop on the inverter side in real time, the slope and working range of the current deviation control characteristic can be dynamically adjusted. When a serious fault occurs, the slope of the control characteristic can be increased to enhance the sensitivity of the system when a serious fault occurs.

[0048] figure 1 It is the characteristic diagram of adaptive current deviation control. Characteristic 1 is the traditional current deviation control characteristic, while characteristics 2 and 3 are the corresponding control characteristics of adaptive current deviation control under different voltage changes, and 3 corresponds to the sit...

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Abstract

The invention discloses a HVDC continuous commutation failure inhibition method based on self-adaptive current deviation control. On the one hand, the traditional linear current deviation control is converted into the self-adaptive current deviation control, the slopes and the work intervals of the different current deviation control characteristics are set according to the dropping degree of theAC voltage, and the dynamic response of the HVDC system in serious fault is enhanced; on the other hand, whether the system is in single-phase fault is judged by detecting the zero-sequence componentof the system, and the single-phase fault compensation control is set; the sensitivity on the single-phase fault by the HVDC system is improved, and the possibility of the continuous commutation failure of the HVDC system is further reduced.

Description

technical field [0001] The invention relates to the field of HVDC continuous commutation failure suppression control, in particular to an HVDC continuous commutation failure suppression method based on adaptive current deviation control. Background technique [0002] my country's primary energy and load demand are in reverse distribution, which objectively requires the optimal allocation of energy in a wide range. High-voltage direct current transmission (HVDC) has a large power transmission capacity, high transmission reliability, and can realize asynchronous interconnection of AC power grids. Therefore, it has become an important means of long-distance and cross-regional grid interconnection in my country. However, the grid commutation converter high-voltage direct current transmission (LCC-HVDC) uses the thyristor as the commutation device, which is easily affected by faults such as the drop of the AC voltage on the inverter side and the short-term increase of the DC curr...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02M1/32H02M7/505
CPCH02J3/36H02M1/32H02M7/505Y02E60/60
Inventor 孟庆强刘泽洪罗安周小平汪鑫夏海涛洪乐荣刘一锋姜劲松王霞
Owner STATE GRID HUNAN ELECTRIC POWER
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