Online measurement method for impedance parameter of three-phase asymmetric power transmission line

A technology of transmission lines and measurement methods, which is applied in the direction of measuring resistance/reactance/impedance, measuring devices, measuring electrical variables, etc., and can solve problems such as the inability to calculate the distribution parameters of multi-circuit transmission lines on the same tower

Inactive Publication Date: 2015-08-05
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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Problems solved by technology

This method is more accurate in calculating the distribution parameters of single-circuit lines, but for multi-circuit transmission lines on the same tower with strong electromagnetic induction, the numbe

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  • Online measurement method for impedance parameter of three-phase asymmetric power transmission line
  • Online measurement method for impedance parameter of three-phase asymmetric power transmission line
  • Online measurement method for impedance parameter of three-phase asymmetric power transmission line

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Embodiment Construction

[0032] The online measurement method for impedance parameters of three-phase asymmetrical transmission lines of the present invention is suitable for tested three-phase asymmetrical transmission lines with a length less than 20 km, comprising the following steps:

[0033] Step 1: Install synchronous measuring devices at both ends of the three-phase asymmetrical transmission line under test, and at n different times (the line current differences at n different times are large enough to ensure that the established n equations are linearly independent) Synchronously measure the three-phase voltage and current signals at both ends of the three-phase asymmetric transmission line under test by the synchronous measuring device, so as to obtain n sets of measurement data at different measurement times, where n is a positive integer and n≥3;

[0034] Among them, the above-mentioned synchronous measurement device can be selected from the prior art based on the GPS synchronous clock to re...

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Abstract

The invention discloses an online measurement method for impedance parameter of a three-phase asymmetric power transmission line, which comprises the steps of: a first step, mounting synchronous measurement devices at two ends of a measured three-phase asymmetric power transmission line, and synchronously measuring the three-phase voltage and current signals at two ends of the measured three-phase asymmetric power transmission line through the synchronous measurement devices at n times; a second step, perform quick Fourier transform on n sets of three-phase voltages and current signals which are acquired in the first step, thereby calculating n sets of three-phase voltage industrial frequency vectors at two ends of the measured three-phase asymmetric power transmission line and n sets of three-phase current industrial frequency vectors at the first end of the measured three-phase asymmetric power transmission line; a third step, calculating the self impedance parameter of each phase and mutual impedance parameters among different phases; and a fourth step, calculating a positive sequence impedance, a negative sequence parameter, a zero sequence parameter and coupling impedance parameters among the phases. The online measurement method realizes online measurement for the impedance parameter of the three-phase asymmetric power transmission line, and furthermore has a relatively high measurement precision.

Description

technical field [0001] The invention relates to an on-line measurement method for impedance parameters of a three-phase asymmetric transmission line. Background technique [0002] The power frequency parameters of transmission lines are necessary parameters for power system calculation of power flow, short-circuit current calculation, relay protection setting calculation and formulation of operation mode, and its accuracy is directly related to the accuracy of these calculation results. If the transmission line parameters used in the calculation are inaccurate, it may have a great impact on the power system, and even cause major power accidents. [0003] There are mainly theoretical calculation methods and measurement methods to obtain transmission line parameters. The theoretical calculation method is to calculate the resistance, inductance, conductance and capacitance parameters of the transmission line by using the physical parameters such as the self-geometric mean dist...

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Application Information

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IPC IPC(8): G01R27/08
Inventor 张跃陈晓科赵艳军赵进全盛超孙闻付聪王钤骆潘钿唐景星安然然张健张远王奕胡玉岚王玲马明翁洪杰张俊峰郭明理高岩袁伟明何溪候岩岩万婉
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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