Unlock instant, AI-driven research and patent intelligence for your innovation.

Method and device for realizing power grid state estimation based on line temperature dynamic change

A power grid state estimation and dynamic change technology, applied in measurement devices, design optimization/simulation, special data processing applications, etc., can solve problems that do not conform to power grid operation conditions, aggravate the range of changes, and violent fluctuations in line temperature, etc., to achieve design principles Reliable, minimal changes, easy programming effects

Pending Publication Date: 2021-01-19
STATE GRID SHANDONG ELECTRIC POWER COMPANY WEIFANG POWER SUPPLY +1
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because meteorological conditions change at any time, unexpected events and abnormal weather exacerbate the range of change, resulting in the line temperature changing all the time, so the above assumption that the line temperature is in a constant state is obviously not true in practice; moreover, if it is necessary to Calculating the line temperature in a short time scale, ignoring the above dynamic change process of the line temperature will lead to drastic fluctuations in the line temperature, which is obviously not in line with the actual operation of the power grid

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method and device for realizing power grid state estimation based on line temperature dynamic change
  • Method and device for realizing power grid state estimation based on line temperature dynamic change
  • Method and device for realizing power grid state estimation based on line temperature dynamic change

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] Such as figure 1 As shown, the present invention provides a method for realizing grid state estimation based on line temperature dynamic changes, including the following steps:

[0082] S1. Obtain the topological relationship between grid nodes, the electrical parameters and line material parameters of each transmission line between nodes;

[0083] S2. collect the real-time electrical quantity measurement data of the whole network of the power grid and the meteorological quantity measurement data at the position of each transmission line;

[0084] S3. Using the grid node voltage amplitude and phase angle as the state quantity parameters, establish an electrical quantity measurement equation, and use the weighted least square method, and based on the collected real-time electrical quantity measurement data of the entire power grid, establish an objective function to calculate the state quantity parameters estimated value of

[0085] S4. Calculate the real-time current ...

Embodiment 2

[0088] Such as figure 2 As shown, the present invention provides a method for realizing grid state estimation based on line temperature dynamic changes, including the following steps:

[0089] S1. Obtain the topological relationship between grid nodes, the electrical parameters and line material parameters of each transmission line between nodes; the electrical parameters of transmission lines between nodes include resistance R, reactance X, susceptance B, line length l, and line rated voltage level U b ; The line material parameters of the transmission line include the heat capacity mC p and conductor heat absorption coefficient α;

[0090] S2. Collect the real-time electrical quantity measurement data of the whole network of the power grid and the meteorological quantity measurement data at the location of each transmission line; the electrical quantity measurement data include node voltage amplitude, node injection power and power flow data of all transmission lines conne...

Embodiment 3

[0113] Such as Figure 4 As shown, to obtain the topological relationship between power grids, the IEEE39 node calculation example is used. In this calculation example, 1, 3, 5, 7, 9, 10, 13, 15, 17, 19, 21, 23, 25, 27, 29 , 30, 31, 32, 33, 34, 35, 37, and 39 nodes to install SCADA measurement equipment;

[0114] Obtain the electrical parameters of each transmission line in the power grid, including line resistance, reactance, susceptance parameters (after per unitization), line length, and initial temperature of the line, such as Figure 5 , Image 6 as well as Figure 7 shown;

[0115] Assume that the rated capacity of the system is Sb=100MVA, the voltage level of all nodes is set to Ub=345kV, the model of all lines is LGJ-300 / 40, the heat capacity is mCp=852.72J / (m·℃), and the line parameters are For the data at the rated temperature of 20°C, the heat absorption coefficient α of the conductor is 0.0039, the radiation heat transfer coefficient Ar of the wire is 2.13*10-9...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a method and a device for realizing power grid state estimation based on line temperature dynamic change. The method comprises the following steps: S1, acquiring a topological relation between power grid nodes, and electrical and line material parameters of each power transmission line between the nodes; S2, acquiring real-time electrical quantity measurement data of the whole power grid and meteorological quantity measurement data of each power transmission line; S3, establishing an electrical quantity measurement equation by taking the voltage amplitude and the phase angle of the power grid node as state quantity parameters, and then establishing a target function to calculate estimated values of the state quantity parameters; S4, calculating real-time current according to the estimated value of the state quantity parameter, and calculating various types of heat on the power transmission line per unit length according to the real-time current and the meteorological quantity measurement data; differentiating the heat balance differential equation, and obtaining a temperature estimation value of each power transmission line by using iterative computation; andS5, correcting the electrical parameters of each power transmission line according to the temperature estimation value of each power transmission line, and returning to the step S2.

Description

technical field [0001] The invention belongs to the technical field of power grid state estimation, and in particular relates to a method and device for realizing power grid state estimation based on dynamic changes in line temperature. Background technique [0002] With the rapid increase of electricity load, the operation of the power grid is getting closer and closer to the limit of stability. In order to accurately conduct real-time power grid dispatching and prevent large-scale collapse of the power grid due to local faults, accurate state estimation of the power grid is very important. At present, the main factors affecting the accuracy of grid state estimation are the accuracy of the measurement device and the accuracy of the grid model. Therefore, starting from the above two types of influencing factors, reducing the errors of measurement devices and network models can improve the accuracy of grid state estimation. [0003] At present, the modeling of transmission ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G06F30/20G06F17/13G01D21/02
CPCG06F30/20G06F17/13G01D21/02
Inventor 于学良夏文强刘栋范贝贝惠鑫欣唐行萍曾乐宏于霞范志毅周涛吕海林陈文佼
Owner STATE GRID SHANDONG ELECTRIC POWER COMPANY WEIFANG POWER SUPPLY