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Short-circuit current calculation method based on power grid characteristics

A technology of short-circuit current and calculation method, which is applied in the direction of calculation, calculation model, circuit device, etc., can solve the problems of low efficiency and low accuracy of short-circuit current calculation, and achieve the effect of fast calculation speed and high accuracy

Active Publication Date: 2020-04-24
HUZHOU ELECTRIC POWER SUPPLY CO OF STATE GRID ZHEJIANG ELECTRIC POWER CO LTD +1
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a short-circuit current calculation method based on grid characteristics in order to solve the problem of low efficiency and low accuracy of short-circuit current calculation

Method used

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  • Short-circuit current calculation method based on power grid characteristics
  • Short-circuit current calculation method based on power grid characteristics
  • Short-circuit current calculation method based on power grid characteristics

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Experimental program
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Embodiment 1

[0046] Embodiment one, such as figure 1 As shown, a short-circuit current calculation method based on grid characteristics, including steps:

[0047] A) Select the characteristics of the distribution network. The characteristics of the distribution network include type I characteristics and type II characteristics. The type I characteristics include the node voltage amplitude, node voltage phase angle, active power of line transmission and reactive power of line transmission in the distribution network Power, active power of load nodes and reactive power of load nodes. Class II characteristics include IIDG injection current, input distribution network conditions, IIDG input capacity and cut-off lines. The short-circuit current I flowing through the measurement point after being connected to IIDG f_DG As sample labels, the sample composition is shown in Table 1.

[0048] Table 1 Sample Composition

[0049]

[0050] Table 1B) as figure 2 As shown, the IEEE34 node power d...

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Abstract

The invention relates to the technical field of power systems, and discloses a short-circuit current calculation method based on power grid characteristics. The method comprises the steps of A) selecting power distribution network characteristics, and taking short-circuit current If_DG flowing through a measurement point after IIDG access as a sample label; B) performing power grid modeling and simulation by utilizing simulation software to obtain a sample set; C) establishing a machine learning model through a machine learning integration method, and performing error analysis; and D) using the trained machine learning model for short circuit current calculation. According to the short-circuit current calculation method, by analyzing the power distribution network characteristics related to the short-circuit current, a power distribution network characteristic combination is provided; power grid modeling and simulation are carried out by utilizing simulation software to form the sampleset; short-circuit current calculation is accurately carried out; the calculation speed is high; and the calculation result accuracy is high.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a short-circuit current calculation method based on grid characteristics. Background technique [0002] With the continuous development of the global economy and society, more and more distributed generators (DG) are integrated into the distribution network through power electronic inverters. -interfaced distributed generator, IIDG). Due to the strong nonlinear characteristics of IIDG, when a short circuit occurs in the distribution network, the output short-circuit current is very different from that of the traditional power supply, which makes the calculation method of the traditional distribution network short-circuit current unsuitable. Therefore, the research on the distribution network under the high penetration of IIDG The calculation method of short-circuit current has important theoretical and practical significance. [0003] For example, a kind of "AC short-circ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00G06F30/20G06F30/27G06N20/00G06F113/04
CPCH02J3/00G06N20/00
Inventor 黄志华沈建良王小仲刘莹姚建锋沈竹李正明楼国强杨劲松韩磊张霄霄
Owner HUZHOU ELECTRIC POWER SUPPLY CO OF STATE GRID ZHEJIANG ELECTRIC POWER CO LTD
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