Phase-changing failure suppression method based on direct current prediction control

A commutation failure, predictive control technology, applied in the direction of DC network circuit devices, irreversible DC power input to AC power output, electrical components, etc. Phase, commutation failure and other problems, to achieve the effect of enhancing control, conducive to safe and stable operation, and reducing the probability of commutation failure

Inactive Publication Date: 2013-05-01
STATE GRID CORP OF CHINA +3
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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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  • Phase-changing failure suppression method based on direct current prediction control
  • Phase-changing failure suppression method based on direct current prediction control

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Embodiment Construction

[0014] 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.

[0015] Below in conjunction with accompanying drawing, the technical scheme of invention is described in detail:

[0016] 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 phase-changing failure suppression method based on direct current prediction control, and the method comprises the following steps of inputting direct current Id_inv at an inversion side and alternative-current bus three-phase instantaneous voltage ua, ub and uc; adopting a phase-changing failure prediction control module to detect the operation state of a current alternative-direct-current system so as to judge whether the phase-changing failure of an inverter happens or not; adopting a phase-changing failure prediction control module to predict and output an inverter trigger retardation angle variation value delta ainv_PREV; detecting a judgment signal of the phase-changing failure prediction control module, predicting a direct current setting value if the phase-changing failure possibly occurs to obtain a prediction value Id_PREV, and otherwise enabling the direct current to be a normal setting value Id_NOR; and outputting the Id_PREV and the delta ainv_PREV to a rectifier and inverter control system to be used for suppressing the phase-changing failure. Due to the adoption of the phase-changing failure suppression method, the phase-changing failure probability of a direct-current power transmission system can be reduced.

Description

technical field [0001] The invention belongs to the technical field of power system operation and control, and in particular relates to a commutation failure suppression method based on direct current predictive control. 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 oper...

Claims

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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袁鲁海
Owner STATE GRID CORP OF CHINA
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