Distribution line impedance online identification method

A technology of distribution lines and identification methods, applied in the direction of circuit devices, AC network circuits, electrical components, etc., can solve the problems of complex calculation process, failure to fully utilize active power, reactive power, power factor, etc.

Active Publication Date: 2014-08-06
STATE GRID CORP OF CHINA +1
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  • Abstract
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Problems solved by technology

However, this method only uses information such as the voltage and current at the beginning and end of the line, and fails to make full use of the information such as active power, reactive power, and power factor that can be collected at both ends of the line, and uses complex numbers for calculation, which makes the calculation process more complicated.

Method used

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  • Distribution line impedance online identification method
  • Distribution line impedance online identification method
  • Distribution line impedance online identification method

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Embodiment Construction

[0050] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0051] With the development of distribution network, traditional parameter identification theory can no longer meet the needs of modern power system analysis, and new parameter identification theory and methods must be studied. For the actual operating lines in the distribution network, usually only the beginning and end of the line are equipped with measuring devices, which can collect information such as voltage, current, and power at this point. However, a point with a measuring device can collect a large amount of data at different times of the point. Based on the above considerations, as image 3 , the present invention provides a method for on-line identification of distribution line impedance, said method comprising the following steps:

[0052] Step 1: Establish a line impedance analysis calculation model;

[0053] Step 2: collect and select line d...

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Abstract

The invention provides a distribution line impedance online identification method. The method includes the following steps that a circuit impedance analytical calculation model is set up, and circuit data samples are collected and selected; the least square method is used for calculating circuit impedance. According to the distribution line impedance online identification method, information of voltages, currents, active power, reactive power (or voltage, current and power factors) and the like collected across the two ends of a circuit are fully utilized, calculation is simple, needed data are easy to acquire, the requirement for distinguishing a majority of distribution line parameters can be met, and the distribution line impedance online identification method is not affected by loads borne by the circuit and also not affected by a circuit position, environment factors and the like. Accurate calculation can be achieved in any external reason affection conditions, and practicability is high.

Description

technical field [0001] The invention belongs to the technical field of power system operation control, and in particular relates to an online identification method for distribution line impedance. Background technique [0002] The distribution network is at the end of the power system and is directly connected to the daily power loads and industrial, agricultural, and commercial electrical equipment, which makes the distribution lines prone to aging, environmental corrosion, and construction, transformation, and accidents during operation. and other effects, resulting in changes in line impedance. Line impedance changes will inevitably affect the final results of power flow calculation, fault analysis, network loss calculation, relay protection setting calculation, short-circuit current and fault location. Improper line parameters will cause the calculation results to be inconsistent with the actual situation, thus posing a potential danger to the system or causing unnecess...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00
Inventor 贾东梨宋晓辉盛万兴孟晓丽常松李建芳张瑜李雅洁赵姗姗高菲张琳
Owner STATE GRID CORP OF CHINA
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