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PMU-based power distribution network T-shaped line parameter identification method and system

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 achieves the effects of fast calculation speed, high identification accuracy, and improved identification accuracy.

Active Publication Date: 2020-01-14
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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  • PMU-based power distribution network T-shaped line parameter identification method and system
  • PMU-based power distribution network T-shaped line parameter identification method and system
  • PMU-based power distribution network T-shaped line parameter identification method and system

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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-shaped 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 a...

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

The invention provides a PMU-based power distribution network T-shaped line parameter identification method and a system. The identification method comprises the following steps: reading Power Management Unit (PMU) measurement data required to be identified at three ends of a T-shaped line; establishing a T-shaped line parameter identification model based on least square method in order to measureminimum differences between estimation values and the PMU measurement data; and solving the T-shaped line parameter identification model based on the least square method by using the Newton iterationmethod to obtain T-shaped line parameters. The PMU-based power distribution network T-shaped line parameter identification method and the system has the advantages of high identification precision, high calculation speed and strong practicability, and according to the method and the system, not only can resistance and reactance parameters be accurately identified, but also an influence of shunt capacitance can be taken into account to identify susceptance parameters.

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 Applications(China)
IPC IPC(8): G01R27/02G01R27/26G01R25/00G06F30/20
CPCG01R27/02G01R27/2605G01R25/00
Inventor 周健侯彦弱方陈张恒旭刘舒曾平石访
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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