Double loop cross wire failure type discriminating method for stabilizing control system

Abstract

The invention relates to a method for judging fault types of double-loop interline for a stabilized control system, which comprises the following steps: firstly, the method of getting ready for judging interline faults, secondly, a method for judging double-loop same-name phase interline grounding faults comprises rapidly judging the fault as double-loop area same-name phase interline grounding faults before a brake in an integral group is repeatedly closed if the line and an adjacent line both have some same-name single-phase faults, thirdly, a method for judging double-loop different-name phase interline grounding faults comprises rapidly judging the fault as the line area different-name interline grounding faults when the line interphase faults jump a single phase and an adjacent single-phase faults jump a single phase, fourthly, a method for judging the faults of double-loop single phase which strides a plurality of phases comprises rapidly judging the faults of single phase which strides a plurality of phases in double-loop area if a single phase of the line is instantly judged out and adjacent line phases go wrong, fifthly, a method for judging the faults of double-loop multiple phases which strides multiple phases comprises rapidly judging faults of multiple phases which stride multiple phases in a double-loop area if the line and the adjacent both have interphase faults.

Description

1. Technical field [0001] The invention relates to a method for judging cross-line faults of double-circuit lines by applying the principle of line distance protection, which is applied to the judgment of cross-line fault types of double-circuit lines in a high-voltage AC transmission system in a safety and stability control system. 2. Background technology [0002] At present, the method of safety and stability control system to solve the problem of transient stability of power system is to rely on its own identification of fault trips and non-fault trips in the system, and cut machines and loads according to established strategies to ensure system stability. In this case, the reliable identification of the fault type of the system directly affects the strategy implemented by the safety and stability control system. [0003] In the current power system safety and stability control devices, the existing line fault discrimination criteria are all for the single-line fault typ...

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Problems solved by technology

[0036] For the first time, the present invention will use the principle of distance protection to discriminate the types of cross-line faults of parallel double-circuit lines on the same pole. The safety and stability control device can formulate corresponding strategies to cut machines and loads according to the judgment results of the method provided by the present invention. This solves the problem of The original single-line criterion may cause the problem of insufficient load shedding when crossing the line, which is more conducive to system stability

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