Three-dimensional parameter reconstruction method for single-wire current

A line current and parameter technology, which is applied in the field of power system operation monitoring and measurement calculation, can solve the problems of high calculation complexity, deviation of the result from the real value, and high requirements for the measurement platform, so as to improve the calculation accuracy and simplify the inversion calculation process Effect

Pending Publication Date: 2019-08-16
TSINGHUA UNIV +2
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Problems solved by technology

As the most common type of current source in power systems, line current is generally based on two-dimensional magnetic field for current inversion, which has the disadvantages of high requirements on the measurement platform and large inversion error. Current inversion for three-dimensional magnetic field is subject to The influence of calculation model complexity, in the nonlinear optimization solution for all types of parameters, not only the calculation complexity is large, but the result is easy to deviate from the real value and fall into the local optimum

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  • Three-dimensional parameter reconstruction method for single-wire current
  • Three-dimensional parameter reconstruction method for single-wire current
  • Three-dimensional parameter reconstruction method for single-wire current

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[0029] The present invention will be specifically described below in conjunction with the accompanying drawings.

[0030] A three-dimensional parameter reconstruction method for a single wire current, comprising a model building step, a data processing step, and a parameter propagation step, wherein the model building step, data processing step, and parameter inversion step are performed sequentially,

[0031] In the model building step, a three-axis Cartesian coordinate system is established, and a single long straight line current model including position parameters, angle parameters, and amplitude parameters is set,

[0032] In the data processing step, multiple sets of data processing methods are used to sequentially solve the direction parameter, position parameter, and amplitude parameter of the current,

[0033] In the parameter inversion step, the time-varying curve of the magnetic field intensity is discretized, and the amplitude parameters at multiple times are subje...

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Abstract

A three-dimensional parameter reconstruction method for a single-wire current comprises a model establishment step, a data processing step and a parameter multiplication step, and the model establishment step, the data processing step and the parameter inversion step are sequentially carried out. The method has the beneficial effects that the inversion calculation process is simplified, the parameter calculation precision is improved, and a local optimal solution is effectively prevented from being caught in nonlinear optimization solution. The current traditional line current measurement modecan be replaced to a certain extent, and an accurate parameter reconstruction result can be rapidly obtained under the condition that all line current parameters are unknown.

Description

technical field [0001] The invention relates to the field of power system operation monitoring and measurement calculation, in particular to a three-dimensional parameter reconstruction method of a single line current. Background technique [0002] Power systems have different measurement requirements for currents at different voltage levels and in different electrical equipment. Usually, the measurement range of steady-state current is 5mA-6kA, and the measurement range of small currents such as leakage current is 100μA -10mA, the measurement range of large currents such as transient currents is 10kA-100kA, the amplitude of different currents spans 8-9 orders of magnitude, and the frequency ranges from DC to about 50MHz. This global measurement range puts forward higher requirements for the measurement device, including high measurement accuracy, large measurement range, small temperature drift, easy installation, and low cost. According to different principles, the curren...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 胡军赵根欧阳勇吴阳王博张波余占清曾嵘何金良马慧远于希娟
Owner TSINGHUA UNIV
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