HVDC Continuous Commutation Failure Suppression Method Based on Adaptive Current Deviation Control

A technology of current deviation and commutation failure, which is applied in the direction of power transmission AC network, output power conversion device, conversion of AC power input to DC power output, etc., and can solve the problem of low sensitivity, inverter side voltage and DC transmission power adjustment Slow, slow response and other problems to achieve the effect of improving sensitivity, avoiding continuous commutation failure, and reducing the possibility

Active Publication Date: 2022-03-11
STATE GRID HUNAN ELECTRIC POWER +1
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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 Suppression Method Based on Adaptive Current Deviation Control
  • HVDC Continuous Commutation Failure Suppression Method Based on Adaptive Current Deviation Control
  • HVDC Continuous Commutation Failure Suppression Method Based on Adaptive Current Deviation Control

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Embodiment Construction

[0048] 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.

[0049] 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 suppression method based on adaptive current deviation control. On the one hand, the traditional linear current deviation control is transformed into adaptive current deviation control, and different current deviation controls are set according to the degree of decline of the AC voltage. The slope and working range of the characteristics enhance the dynamic response of the HVDC system in severe faults; on the other hand, by detecting the zero-sequence component of the system to judge whether a single-phase fault occurs in the system, and setting single-phase fault compensation control, it improves The sensitivity of the HVDC system to single-phase faults further reduces the possibility of continuous commutation failures in the HVDC system.

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 Patents(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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