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A PMU-based identification method and system for T-type line parameters of distribution network

A line parameter and identification method technology, which is applied in the field of power system line parameter identification, can solve the problem that the identification of parameters cannot be simply borrowed, and achieve the effects of fast calculation speed, improved identification accuracy, and high identification accuracy

Active Publication Date: 2022-03-04
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the T-type overhead line widely existing in the distribution network is a line composed of three branch lines. Since only one end of each branch line has the measurement conditions of PMU, the identification of its parameters cannot simply borrow the power transmission line. The double-terminal π-type equivalent line model of the network needs to study the identification method specially suitable for T-type lines

Method used

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  • A PMU-based identification method and system for T-type line parameters of distribution network
  • A PMU-based identification method and system for T-type line parameters of distribution network
  • A PMU-based identification method and system for T-type line parameters of distribution network

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Embodiment 1

[0030] In the technical solutions disclosed in one or more embodiments, such as figure 1 As shown, a PMU-based T-line parameter identification method for distribution network, the specific steps are as follows:

[0031] Step 1. Read the PMU measurement data at the three ends of the T-shaped line that needs to be identified;

[0032] Step 2, aiming to minimize the difference between the estimated value of the quantity measurement and the measured data of the PMU, and establishing a T-type line parameter identification model based on the least squares method;

[0033] Step 3: Using the Newton iterative method to solve the T-shaped line parameter identification model based on the least square method to obtain the T-shaped line parameters.

[0034] As a further improvement, the T-type line parameter identification model based on the least squares method includes an objective function and a calculation model of the estimated value of the quantity measurement, and the steps of usin...

Embodiment 2

[0088] This embodiment provides a PMU-based T-type line parameter identification system of distribution network, including:

[0089] PMU measurement data reading module: used to read the PMU measurement data at the three ends of the T-shaped line that needs to be identified;

[0090] Model building module: used to establish a T-type line parameter identification model based on the least square method with the goal of minimizing the difference between the estimated value of the quantity measurement and the measured data of the PMU;

[0091]T-shaped line parameter solving module: used for solving the T-shaped line parameter identification model based on the least square method by using Newton iteration method to obtain T-shaped line parameters.

[0092] Further, the T-shaped line parameter solving module includes:

[0093] Initialization module: for setting the T-type line parameter initial value and the initial estimated value of the voltage amplitude and the voltage phase ang...

Embodiment 3

[0099] This embodiment provides an electronic device, including a memory, a processor, and computer instructions stored in the memory and run on the processor. When the computer instructions are run by the processor, the method described in any one of Embodiment 1 is completed. step.

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Abstract

This disclosure proposes a PMU-based T-line parameter identification method and system in distribution network. The identification method includes reading the PMU measurement data at the three terminals of the T-line that needs to be identified; measuring the estimated value and the PMU measurement data The minimum difference between them is the goal, and a T-type line parameter identification model based on the least square method is established; the Newton iterative method is used to solve the T-type line parameter identification model based on the least square method, and the T-type line parameters are obtained. It has the advantages of high identification accuracy, fast calculation speed, and strong practicability. It can not only accurately identify resistance and reactance parameters, but also can identify susceptance parameters considering the influence of parallel capacitors.

Description

technical field [0001] The present disclosure relates to the related technical field of power system line parameter identification, and in particular, relates to a PMU-based T-type line parameter identification method and system of a power distribution network. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] The power system is one of the infrastructures of modern industry, and maintaining the safe and stable operation of the power system is of great significance to economic and social life. Power system operation requires state estimation, power flow calculation, short-circuit current calculation, grid relay protection setting, safety and stability assessment, and control decision-making, etc., and the parameters of power grid equipment components are the basis for these analyzes and controls. Safe, economical operation and effective c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/02G01R27/26G01R25/00G06F30/20
CPCG01R27/02G01R27/2605G01R25/00
Inventor 周健侯彦若方陈张恒旭刘舒曾平石访
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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