Method and system for acquiring measure amount of direct current bipolar line fault of flexible direct current grid
A line fault, flexible straightening technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of lack of safety control device design method, threat to the safety of flexible DC power grid engineering, stable operation level, lack of safety control system, etc.
Active Publication Date: 2019-03-19
CHINA ELECTRIC POWER RES INST +1
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Problems solved by technology
[0005] At present, for the flexible DC power grid project, there is a lack of design methods for its safety control devices, especially the calculation method for the amount of fault measures for the safety control system in the event of a fault. This lack will seriously threaten the safe and stable operation of the flexible DC power grid project.
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[0051] Exemplary embodiments of the present invention will now be described with reference to the drawings; however, the present invention may be embodied in many different forms and are not limited to the embodiments described herein, which are provided for the purpose of exhaustively and completely disclosing the present invention. invention and fully convey the scope of the invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings do not limit the present invention. In the figures, the same units / elements are given the same reference numerals.
[0052] Unless otherwise specified, the terms (including scientific and technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it can be understood that terms defined by commonly used dictionaries should be understood to have consistent meanings in the context of their related fields, and should not be understood as idealized or over...
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The invention discloses a method and a system for acquiring the measure amount of a direct current bipolar line fault of a flexible direct current grid, which belongs to the technical field of power system safety and stability control. The method provided by the invention comprises the steps that the fault of a direct current bipolar line Li is determined; the measure amount of the direct currentbipolar line fault is determined when a converter Si_x is locked due to the direct current bipolar line fault; and when a converter station Si is locked due to the direct current bipolar line fault,the measure amount of the direct current bipolar line fault is determined; and when single pole locking and single station locking are not caused by the direct current bipolar line fault, the measureamount of the direct current bipolar line fault is determined. According to the invention, when a flexible direct current grid safety control system has a converter locking fault, the safety control system thereof can calculate the correct fault measure amount; and safe and stable operation of the flexible direct current grid can be effectively ensured.
Description
technical field [0001] The present invention relates to the technical field of power system safety and stability control, and more specifically relates to a method and system for obtaining fault measure quantities of DC bipolar lines in flexible DC power grids. Background technique [0002] The grid-connected transmission and consumption of large-scale new energy power generation is of great significance. Flexible DC transmission is an advanced DC transmission technology. Based on flexible DC transmission technology, a flexible DC power grid can be formed, which can realize different regions and different types of new energy grid-connected collections, and achieve functions such as smoothing new energy output fluctuations. Therefore, the flexible DC grid has significant advantages in the integration and consumption of new energy power generation, and it is one of the important directions for the future grid development. [0003] The power system security control device is a...
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Login to View More IPC IPC(8): H02H7/26
CPCH02H7/268
Inventor 卜广全赵兵王姗姗王铁柱李英彪孙华东吴广禄马士聪
Owner CHINA ELECTRIC POWER RES INST