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

A Thevenin Equivalent Parameter Identification Method Based on Reduced Self-Sensitivity

A Thevenin equivalent, parameter identification technology, applied in the field of value parameter identification, can solve the problems of difficult application, large amount of calculation, and difficult to obtain, and achieves the effect of simple acquisition, small amount of calculation, and expanded application scope.

Active Publication Date: 2021-07-13
HARBIN INST OF TECH
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the existing single-time Thevenin equivalent parameter calculation method has a large amount of calculation and it is difficult to obtain the WAMS vector in some power system wide-area measurements, and when the accuracy and speed cannot be guaranteed, the existing single-time Thevenin It is difficult to apply the equivalent parameter calculation method, and a Thevenin equivalent parameter identification method based on reduced-order self-sensitivity is proposed

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
  • A Thevenin Equivalent Parameter Identification Method Based on Reduced Self-Sensitivity
  • A Thevenin Equivalent Parameter Identification Method Based on Reduced Self-Sensitivity
  • A Thevenin Equivalent Parameter Identification Method Based on Reduced Self-Sensitivity

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0025] DETAILED DESCRIPTION OF THE INVENTION The specific process of Davidan equivalent parameter identification method based on down-order self-sensitivity is, figure 1 Down:

[0026] Step 1, the active transmission sensitivity indicator R of all branches in the power system TP,i And reactive transmission sensitivity indicator R TQ,i , Have a power transmission sensitivity indicator R TP,i And reactive transmission sensitivity indicator R TQ,i The value is sorted from large to small;

[0027] Step II. Judgment the active transmission sensitivity indicator R TP,i And reactive transmission sensitivity indicator R TQ,i Whether the sequence is hopping, depending on whether the hop judgment power system is a simple power system or complex power system, if the power system is a simple power system, step three; if the power system is a complex power system, step four;

[0028] Step 3, the power system is a simple power system, screen the branch and establish a collection S SA , Perform ...

specific Embodiment approach 2

[0033] DETAILED DESCRIPTION OF THE INVENTION 2: This embodiment is different from that of the particular embodiment is that the active transmission sensitivity indicator R of all branches in the power system is calculated in the step one in the step one. TP,i And reactive transmission sensitivity indicator R TQ,i The specific process is:

[0034] Definition line L l1,l2 The equivalent active power of the transmission and the equivalent reactive power of the Identification of the active power and reactive power division of the load node i are line active transmission sensitivity indicator R. TP,i,l12 Dissactive sensitivity indicator R TQ,i,l12 The expression is as follows:

[0035]

[0036]

[0037] Where: P T,l12 Line L l1,l2 Powerful power transmitted by the upper transmission; Q T,l12 Line L l1,l2 Upload reactive power; P i Injective power for the injection of the load node i; Q iFor the injection reactive power of the injection node i; the line is the general name of the br...

specific Embodiment approach 3

[0054] DETAILED DESCRIPTION OF THE INVENTION The present embodiment is different from that of the specific embodiment: the formula (8), (9) The specific process is:

[0055] Sensitivity parameters include associated sensitivity parameters and self-sensitivity parameters;

[0056] Associated sensitivity parameters;

[0057] definition Associated sensitivity parameters between nodes m and n; definition The self-sensitivity parameter of Node M; M represents any node in the power system line, represents L1 or L2, N represents any node other than M in the power system line, m ≠ n;

[0058] If the sensitivity matrix C represents the sensitivity matrix of power and voltage, all nodes of self-sensitivity parameters and associated sensitivity parameters constitute a sensitivity matrix C. -1 Elements, through the sensitivity parameters of all nodes to obtain the inversion matrix in the sensitivity matrix C;

[0059] The sensitivity matrix C expression is as follows:

[0060]

[0061]...

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

A Thevenin equivalent parameter identification method based on reduced-order self-sensitivity, the invention relates to the Thevenin equivalent parameter identification method. The purpose of the present invention is to solve the problem that the existing single-time Thevenin equivalent parameter calculation method has a large amount of calculation and it is difficult to obtain the WAMS vector in some power system wide-area measurements, and when the accuracy and speed cannot be guaranteed, the existing single-time Thevenin The problem that the equivalent parameter calculation method is difficult to apply. The process is: calculate the active and reactive power transmission sensitivity indicators of all branches in the power system, and sort the values ​​from large to small; judge whether there is a jump in the sequence, judge whether the power system is simple or complex, and if it is simple, establish a set ; If it is complex, set up a set; divide the sensitivity matrix into blocks according to the set, construct a reduced-order sensitivity matrix, and replace the sensitivity matrix; calculate self-sensitivity parameters; calculate Thevenin equivalent parameters. The invention is used in the field of power system safety analysis.

Description

Technical field [0001] The present invention relates to a method of Davidan equivalence parameter identification method involving power system control. Background technique [0002] With the rapid growth of electricity and the large number of intermittent energy such as wind power, solar energy, the power dispatch center needs to monitor and evaluate the operating state of the system in real time to ensure the stable operation of the power system. The Wide Area Measurement System is composed of a parent measuring unit (PMU), a phaventric data collection system (PDC), the High Speed ​​Communication Network System (HSCNS), and the Application Center (AAC), is an acquisition of synchronous phase data, Integrated technology for collecting, transmitting, analyzing and applications. Voltage data can be obtained by wide-area measurement techniques to obtain a large number of real-time measurements of nodes in the equivalent system, providing a basis for analyzing model parameter identif...

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
Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00G06F17/16
CPCG06F17/16H02J3/00H02J2203/20
Inventor 李成玉孙天奎吕钦刚任洪林牟晓明
Owner HARBIN INST OF TECH