Direct current predicting and setting method for inhibiting commutation failure

A commutation failure, DC current technology, applied in the direction of DC network circuit devices, irreversible DC power input to AC power output, electrical components, etc. Reduce the turn-off angle and other problems, to achieve the effect of enhancing control, reducing the probability of commutation failure, and reducing the trigger delay angle

Inactive Publication Date: 2013-05-01
HOHAI UNIV +2
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] According to the constraints of the trigger delay angle range of the inverter working in the inverter mode, if the commutation voltage drops seriously, it may be difficult to ensure the successful commutation of the inverter if the maximum trigger delay angle is advanced; in addition, more commutation a

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  • Direct current predicting and setting method for inhibiting commutation failure
  • Direct current predicting and setting method for inhibiting commutation failure
  • Direct current predicting and setting method for inhibiting commutation failure

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Embodiment Construction

[0027] Below in conjunction with accompanying drawing and specific embodiment, further illustrate the present invention, should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various aspects of the present invention Modifications in equivalent forms all fall within the scope defined by the appended claims of this application.

[0028] Below in conjunction with accompanying drawing, the technical scheme of invention is described in detail:

[0029] The commutation failure of the DC transmission system (mainly the commutation failure of the inverter) seriously threatens the safe and stable operation of the DC transmission system. There have been many studies on its predictive control technology, and the commutation failure predictive control module can better solve the problem. In order to increa...

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Abstract

The invention discloses a direct current predicting and setting method for inhibiting commutation failure. Aiming at the commutation failure problem of an inverter of a direct current power transmission system, the direct current predicting and setting method is effectively established by detecting the direct current at the inverse side of the direct current power transmission system and the alternating current bus voltage, comprehensively considering the influence of the direct current and the alternating current bus voltage on the commutation process of the inverter, and utilizing alternating current bus voltage zero-sequence voltage component, abc-alpha beta conversion and alternating voltage valid values. The method provided by the invention can be used for laying a good foundation for further researching the predicting control method for commutation failure of a direct current power transmission system.

Description

technical field [0001] The invention belongs to the technical field of power system operation and control, and in particular relates to a DC current prediction and setting method for suppressing commutation failure. Background technique [0002] DC transmission has the advantages of large transmission capacity, low loss, rapid and flexible power regulation, and strong asynchronous connection capabilities, making it widely used in large-area grid interconnection and long-distance large-capacity power transmission. With the continuous improvement of my country's power grid construction level, DC transmission projects have become an important technical means to optimize the allocation of power grid resources and coordinate regional economic development. Commutation failure is a common typical system failure in HVDC transmission system, which will cause DC voltage drop and DC current increase for a short time; continuous commutation failure will easily lead to derating operation...

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Application Information

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IPC IPC(8): H02J1/00H02M7/42
Inventor 卫志农袁阳刘振亚郭剑波孙国强孙永辉杨雄陆子刚王炜
Owner HOHAI UNIV
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