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Online virtual measuring method of distribution circuit impedance

A power distribution line and measurement technology, applied to circuit devices, AC network circuits, electrical components, etc., to achieve fast calculation speed, less measurement information, and simple calculation

Active Publication Date: 2013-04-03
CHINA ELECTRIC POWER RES INST +3
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Problems solved by technology

Traditional line parameter calculation methods can no longer meet the needs of modern power system analysis, and new impedance calculation methods must be studied

Method used

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  • Online virtual measuring method of distribution circuit impedance
  • Online virtual measuring method of distribution circuit impedance
  • Online virtual measuring method of distribution circuit impedance

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Embodiment Construction

[0110] The specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0111] For a power line section connected to multiple loads, a linear equivalent calculation model of the voltage drop of the line section with the end current and load current of the power line section as independent variables is established, and based on the collected head and end A, B, C of the line section The three-phase current and voltage information are analyzed and calculated using mathematical methods such as regression analysis or average value solution method to calculate the coefficients of the voltage drop linear equivalent calculation model. The coefficient corresponding to the terminal current is the impedance of the line section, so as to realize the line Online identification of parameters.

[0112] The overall process of the online virtual measurement method for the impedance of the distribution line provided by the p...

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Abstract

The invention relates to an online virtual measuring method of distribution circuit impedance. The method comprises the following steps of: (1) numbering network topology of a distribution network, power circuit sections and nodes; (2) establishing a circuit section voltage dropout linear equivalent calculation model; (3) configuring measuring devices at the head end and the tail end of the circuit section and collecting M groups of data of voltage and current at the head and the tail ends as sample data; (4) analyzing the sample data and calculating impedance of the circuit section; and (5) judging whether the circuit section impedance residual error is subjected to normal distribution with a mean value of zero and a variance of Sigma2. The equivalent impedance is introduced in the online virtual measuring method disclosed by the invention; the circuit section voltage dropout linear equivalent calculation model is established; the impedance of the circuit section is analyzed and calculated by using mathematical methods such as regression analysis methods or mean value equation solving methods; and the online identification of the circuit parameters is realized. The method has the advantages of simplicity in calculation, high calculation speed and high calculation precision, makes up the shortcomings of the traditional method, is suitable for analysis and calculation of the intelligent distribution network and can guarantee precision and real-time performance of calculation.

Description

Technical field [0001] The invention relates to a measurement method in the technical field of power system operation control, in particular to an online virtual measurement method of the impedance of a distribution line. Background technique [0002] The distribution network is at the end of the power system and is directly connected to the electrical loads in daily life and industrial, agricultural, and commercial electrical equipment, causing the distribution lines to be prone to aging, environmental corrosion, construction, transformation, and accidents during operation. And other influences, causing the line impedance to become larger, and adversely affecting the safety and economic operation of the power grid. At present, there are four methods to obtain line parameters: (1) Accurate calculation method: According to the structure, material, temperature, environment and other conditions of the line, the specific parameters are substituted into the calculation formula one by ...

Claims

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Application Information

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IPC IPC(8): H02J3/00G06N3/02
Inventor 盛万兴宋晓辉贾东梨史常凯张瑜李建芳仉天舒胡丽娟刘永梅
Owner CHINA ELECTRIC POWER RES INST
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