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A Calculation Method of Power Line Parameters

A line parameter and calculation method technology, applied in the field of electric power, can solve the problems of calculation result deviation, dependence on known quantities, inaccurate power line parameters, etc., and achieve the effect of improving accuracy and reliability

Inactive Publication Date: 2018-07-06
CHINA SOUTHERN POWER GRID COMPANY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This calculation method is the most intuitive, but it relies heavily on the known quantities, that is, the accuracy of the measured values ​​of current and voltage at both ends of the line. A slight disturbance of the measured quantities will cause a large deviation in the calculation results. Therefore, the power calculated by the existing technology Inaccurate line parameters and poor reliability

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  • A Calculation Method of Power Line Parameters
  • A Calculation Method of Power Line Parameters
  • A Calculation Method of Power Line Parameters

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Embodiment Construction

[0038]The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0039] see figure 1 , a method for calculating power line parameters provided in this embodiment, including:

[0040] S1. Sampling the data measured by the synchrophasor measurement unit to obtain sampled data;

[0041] Specifically, set the initial time t, the time interval s, and collect the data V measured by the synchronized phasor measurement unit within the time interval [t-s, t] S , I S , V R , I R , where V S , V R Represent the voltages at the transm...

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Abstract

The invention discloses a method for calculating power line parameters. The method includes an S1 step of sampling measurement data of a synchronized phasor measurement unit and obtaining sampled data; an S2 step of solving an optimization problem with constraints for the sampled data and obtaining line parameter values to be determined; and an S3 step of determining whether the line parameter values to be determined satisfies preset conditions, if so, taking the line parameter values to be determined as final line parameter values, otherwise removing bad data that do not satisfy the preset conditions in the sampled data, and returning back to the S2 step to continue to make a solution for the sampled data after the removal of the bad data. The embodiment of the invention can be used for accurately calculating power transmission line impedance parameters, so that the accuracy and reliability of the power line parameters obtained are greatly improved.

Description

technical field [0001] The invention relates to the technical field of electric power, in particular to a calculation method of electric line parameters. Background technique [0002] The safe operation of the power system is an important guarantee for the healthy development of the social economy, and the safe operation of the power grid has always been a problem that power grid companies attach great importance to. Scheduling and operating personnel's grasp of the characteristics of the power grid is increasingly dependent on real-time monitoring and analysis based on the power grid model. Accurate grid parameters are the basis for forming an accurate grid model, and then performing power system calculations such as state estimation, power flow calculation, network loss analysis, fault analysis, and relay protection setting calculation. Due to various reasons, the existing line parameters calculated on the basis of traditional methods often have some errors, which affect ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00G06F17/50
CPCY02E40/70Y02E60/00Y04S10/00Y04S10/22
Inventor 赵旋宇荆朝阳周华锋
Owner CHINA SOUTHERN POWER GRID COMPANY