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Power grid voltage stability judgment method under multi-circuit direct-current simultaneous fault

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, high precision, and improve power grid The effect of delivered power quality

Active Publication Date: 2021-03-26
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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  • Power grid voltage stability judgment method under multi-circuit direct-current simultaneous fault
  • Power grid voltage stability judgment method under multi-circuit direct-current simultaneous fault
  • Power grid voltage stability judgment method under multi-circuit direct-current simultaneous fault

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Embodiment Construction

[0039] The technical solutions and technical effects of the present invention will be further described in detail below in conjunction with the accompanying drawings of the present invention.

[0040] Please see figure 1 , in a specific implementation manner, a method for judging grid voltage stability under simultaneous multi-circuit DC faults, comprising the following steps:

[0041] Acquire fault characterization data of multi-circuit DC grid;

[0042] According to the fault characterization data, calculate the voltage margin coefficient A u , AC side reactive power influence coefficient A Q And the voltage recovery ability coefficient A ω ;

[0043] According to the voltage margin factor A u , AC side reactive power influence coefficient A Q , Voltage recovery ability coefficient A ω , through formula (I), calculate the comprehensive evaluation coefficient A of voltage stability:

[0044]

[0045] According to the comprehensive evaluation coefficient A of voltag...

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Abstract

The invention provides a power grid voltage stability judgment method under a multi-circuit direct-current simultaneous fault, and belongs to the technical field of direct-current power transmission.A voltage margin coefficient Au, an alternating-current side reactive power influence coefficient AQ and a voltage recovery capability coefficient Aomega are obtained through calculation according tofault representation data of a multi-loop direct-current power grid, and then a voltage stability comprehensive evaluation coefficient A is calculated according to the voltage margin coefficient Au, the alternating-current side reactive power influence coefficient AQ and the voltage recovery capability coefficient Aomega. According to the voltage stability comprehensive evaluation coefficient A, the voltage stability of the multi-loop direct-current power grid under simultaneous faults is directly judged, judgment is visual and accurate, the accuracy is high, reference is provided for taking reasonable measures and improving the power grid transmission power quality, and the economic cost is reduced.

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 grid under simultaneous faults of multiple direct currents. Background technique [0002] Affected 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 power grid came into being. The multi-loop power grid not only meets the requirements of power grid construction but also adapts to the needs of local urban development planning, which is conducive to the coordination and sustainable development of social and economic development and power grid construction. With the development of multi-loop DC grid, the voltage stability judgment of multi-loop DC grid faults has also attracted more and more attention. [0003] The method for judging the voltage stability of the DC grid includes th...

Claims

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Application Information

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Patent Type & Authority Applications(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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