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Judgment method of grid voltage stability under simultaneous multi-circuit DC faults

A voltage stability and simultaneous fault technology, applied in the direction of AC network voltage adjustment, fault location, power transmission AC network, etc., can solve the problem of poor accuracy of voltage stability judgment, achieve intuitive and accurate judgment, improve power quality of power grid transmission, high precision effect

Active Publication Date: 2022-07-19
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID NINGXIA ELECTRIC POWER COMPANY +2
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Problems solved by technology

[0004] In view of this, the present invention provides a method for judging grid voltage stability under simultaneous multi-circuit DC faults to solve the technical problem of poor accuracy of voltage stability judgment in the state of simultaneous faults of multi-circuit DC grids in the prior art

Method used

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  • Judgment method of grid voltage stability under simultaneous multi-circuit DC faults
  • Judgment method of grid voltage stability under simultaneous multi-circuit DC faults
  • Judgment method of grid voltage stability under simultaneous multi-circuit DC faults

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Embodiment Construction

[0040] The technical solutions and technical effects of the present invention will be further elaborated below with reference to the accompanying drawings of the present invention.

[0041] see figure 1 , In a specific embodiment, a method for judging grid voltage stability under simultaneous multi-circuit DC faults includes the following steps:

[0042] Obtain fault characterization data of multi-circuit DC grid;

[0043] Calculate the voltage margin factor A based on the fault characterization data u , AC side reactive power influence coefficient A Q and the voltage recovery capability factor A ω ;

[0044] According to the voltage margin factor A u , AC side reactive power influence coefficient A Q , Voltage recovery ability coefficient A ω , through the formula (I), calculate the comprehensive evaluation coefficient A of voltage stability:

[0045]

[0046] According to the comprehensive evaluation coefficient A of voltage stability, the voltage stability of the...

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Abstract

The invention provides a method for judging power grid voltage stability under simultaneous faults of multiple-circuit direct current, belonging to the technical field of direct current transmission. Through the fault characterization data of the multi-circuit DC power grid, the voltage margin coefficient A is calculated and obtained separately u , AC side reactive power influence coefficient A Q and the voltage recovery capability factor A ω , and then according to the voltage margin factor A u , AC side reactive power influence coefficient A Q , Voltage recovery ability coefficient A ω , calculate the voltage stability comprehensive evaluation coefficient A, and directly judge the voltage stability of the multi-circuit DC power grid under simultaneous faults according to the voltage stability comprehensive evaluation coefficient A. The judgment is intuitive and accurate, and the accuracy is high. In order to take reasonable measures to improve the power transmission of the power grid Quality provides a reference, which is conducive to reducing economic costs.

Description

technical field [0001] The invention belongs to the technical field of direct current transmission, and in particular relates to a method for judging the voltage stability of a power grid under simultaneous faults of multiple direct currents. Background technique [0002] Influenced by urban planning, in order to increase the transmission capacity, it is necessary to increase the voltage level and increase the transmission circuit. The multi-circuit DC grid came into being. The multi-circuit power grid not only meets the requirements of power grid construction but also meets the needs of local urban development planning, which is conducive to the coordinated and sustainable development of social and economic development and power grid construction. With the development of multi-circuit DC power grids, the judgment of voltage stability in the event of multi-circuit DC power grid faults has also attracted more and more attention. [0003] The method for judging the voltage s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08G01R31/00H02J3/16H02J3/36
CPCG01R31/088G01R31/00H02J3/16H02J3/36Y02E40/30
Inventor 田志浩王峰摆世彬孙丽香刘刚卓谷颖王超刘敏张迪张星薛飞徐得超杨慧彪牛琳琳任勇徐树文梁剑郑伟杰徐翌征
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID NINGXIA ELECTRIC POWER COMPANY
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