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A Complex Fault Series Integration Method Based on Power System Bottom Fault Information
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A fault information and power system technology, applied to electrical components, emergency protection circuit devices, etc., can solve problems such as roughness, complex calculation, and inability to identify multiple complex faults in series, so as to improve accuracy, reduce calculation process, and improve The effect of recognition accuracy
Active Publication Date: 2018-04-10
HUAZHONG UNIV OF SCI & TECH +1
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[0006] In view of the above deficiencies, the present invention provides a complex fault series integration method based on the underlying fault information of the power system, aiming to solve the problem that the existing complex fault identification process is relatively rough and accurate. The technical problem that it is impossible to accurately identify multiple complex faults in series due to the coupling between them
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[0180] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0181] In order to better verify the invented complex fault series integration method based on the underlying fault information of the power system, the embodiment of the present invention discusses the fault series integration under complex fault scenarios.
example 1
[0183] figure 2 It is a schematic diagram of the system structure of 10 machines and 39 nodes in New England. It is assumed that lines 4-14 in the system of 10 machines and 39 nodes in New England are erected as double-circuit lines on the same tower. The capacity limit of each line in the system is set with reference to the power flow under the standard working condition, as shown in Table 1.
[0187] Assuming that the system has the following faults in a short period of time, the time when the first fault occurs is set as the origin of time:
[0188]1) At 0s, the lightning strikes the 250th base tower of the 4-14 double circuit line on the same tower, resulting in a phase A trip event on the 4-14(I) and 4-14(II) lines at 0.1s, and the line overlaps successfully at 1.1s;
[0189] 2) At 8s, a BC two-phase permanent short circuit occurred on line 6-7, resulting in a three-ph...
example 2
[0210] Assuming that the system in Example 1 has the following faults in a short period of time, let the time when the first fault occurs be the origin of time:
[0211] 1) Line 3-18 is struck by lightning at 0s, phase A jumps at 0.1s, and the line recloses successfully at 1.1s;
[0212] 2) Line 16-17 was struck by lightning at 0.04s, phase B jumped out at 0.14s, and the line reclosed successfully at 1.2s;
[0213] 3) Under the influence of strong short-circuit interference, the high-frequency transceiver is not connected to the grounding copper bar, and the stop signal optocoupler action voltage is too low, resulting in high-frequency protection stop signal, causing lines 18-17 to approach The side of bus bar 17 malfunctioned in 0.1s, and the lines 18-17 were cut off, and then the lines reclosed successfully.
[0214] 4) At 15s, the lightning strikes the 250th base tower of the 4-14 double-circuit line on the same tower, resulting in a phase A trip event on the 4-14Ⅰ line an...
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Abstract
The invention discloses a complex fault series integration method based on power system underlying fault information. The complex fault series integration method comprises the follow steps of obtaining underlying fault information of underlying faults, and listing the underlying faults in a time axis according to the sequence of a first sequencing time; arranging a starting point of a time window at a first sequencing time of the first underlying fault; identifying correlation between every two underlying faults in the time window, and distinguishing types of the complex faults; correcting identified nonadjacent cascading faults at the first sequencing time and identified nonadjacent protection hidden faults at the first sequencing moment; moving the starting point of the time window to a first sequencing time of the next adjacent underlying fault, and identifying correlation among the underlying faults in the time window; repeating the above process until correlation of all the underlying faults is identified, and the series integration result of the complex faults is obtained. The complex fault series integration method is advantageous in that, a large amount of underlying fault information uploaded after the complex faults is in a series integration into an accident chain easy to understand, a reference basis is provided for an operation dispatching worker to understand occurrence and development process of faults.
Description
technical field [0001] The invention relates to the technical field of power system fault diagnosis methods, in particular to a method for series integration of complex faults based on bottom fault information of the power system. Background technique [0002] Complex faults in the power system include multiple independent faults, cascading faults, common mode faults, etc., which may include malfunctions or refusal of protection or switches. Independent multiple faults refer to several independent faults that occur within a certain period of time in the power system; cascading faults refer to a fairly clear causal relationship between previous and subsequent faults, that is, the previous fault changes the state of the system, thereby triggering the next fault Fault; common mode fault refers to the failure of several components caused by an external cause at the same time. A large number of literatures have studied the generation mechanism and development form of cascading f...
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