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Supertension line fault phase selection method based on voltage fault component

A technology for line faults and voltage faults, applied in the field of high-voltage power grids, can solve problems such as complex algorithms and large calculations, and achieve the effects of reduced calculations, simple state equations, and good filtering effects

Inactive Publication Date: 2015-06-24
上海市南变配电站服务有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this technology needs to add compensation, and go through the model-phase transformation and solve the differential equation, the algorithm is complex and the amount of calculation is large

Method used

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  • Supertension line fault phase selection method based on voltage fault component
  • Supertension line fault phase selection method based on voltage fault component
  • Supertension line fault phase selection method based on voltage fault component

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Effect test

Embodiment 1

[0024] Such as figure 1 Shown is a schematic diagram of the structure of the EHV transmission system. Refer to the Beijing-Tianjin-Tangshan 500kV ultra-high voltage transmission line parameters.

[0025] Such as figure 2 As shown, the flow chart of the implementation of fault phase selection. The sampling value is filtered by Kalman to obtain the fundamental frequency component of the voltage, and then the identification coefficient of each fault phase is calculated. According to the characteristics of the coefficient in different fault conditions, the purpose of phase selection is achieved.

[0026] Step 1: By establishing a Kalman filter model, the purpose of extracting the fundamental frequency voltage component is achieved, and the influence of harmonics on the phase selection algorithm is reduced.

[0027] The harmonic components considered by the present invention are 2-5 harmonics, and the state transition matrix of the Kalman filter model used is a 10th order squar...

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Abstract

The invention provides a supertension line fault phase selection method based on a voltage fault component in the technical field of high voltage power grids. Three-phase voltage signals at a protective installation position at the time of a line fault are collected to calculate a three-phase voltage fault component, and an obtained proportional relation is used as a fault phase recognition coefficient; logical judgment is conducted according to the relation between the three-phase voltage signals, the three-phase voltage fault component and the fault phase recognition coefficient, namely a single-phase earth fault is judged first, a phase-to-phase fault between two phases is judged if the single-phase earth fault does not exist, and a three-phase earth fault is judged if the phase-to-phase fault does not exist; if the three-phase earth fault does not exist, a two-phase earth fault is judged finally to realize supertension line fault phase selection. The supertension line fault phase selection method based on the voltage fault component has quite high sensitivity and reliability under different fault conditions including fault positions, fault types, transition resistances and initial phase angles, and can select a fault phase quickly and accurately in a latter half cycle of the fault; meanwhile, the scheme of the supertension line fault phase selection method has sufficient sensitivity both on a strong power supply side and on a weak power supply side.

Description

technical field [0001] The invention relates to a method in the technical field of high-voltage power grids, in particular to a method for phase selection of ultra-high voltage line faults based on voltage fault components. Background technique [0002] With the extensive development of electric energy utilization, many countries are building large-capacity hydropower plants, thermal power plants, nuclear power plants, and power plant groups, and the power resources are often far away from the load center. Only by using ultra-high voltage power transmission can the power transmission task be effectively and economically realized. EHV transmission can increase the transmission capacity and transmission distance, reduce the project cost of power transmission per unit power, reduce line loss, save the area of ​​line corridors, and have significant comprehensive economic and social benefits. In addition, the interconnection between large power systems also requires ultra-high vo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/02G01R31/08
Inventor 陈旸胡炎邰能灵张沛超
Owner 上海市南变配电站服务有限公司
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