Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Judgment method for transient stability of AC/DC hybrid power system with flexible DC

An AC-DC hybrid, transient stability technology, applied in the direction of AC network circuits, power transmission AC networks, electrical components, etc., can solve the problems of imperfect flexible DC structure and research, ignoring DC line losses, and ignoring DC line dynamics. And other issues

Active Publication Date: 2021-10-26
BEIJING JIAOTONG UNIV +1
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the application of the direct method in the AC / DC hybrid power system is still in its infancy, and the research on the construction of the energy function of the AC / DC hybrid power system is limited. power load, so that the energy function of the AC-DC hybrid system can be equivalently represented by the energy function of the AC system. The DC line model constructed by this method is too simplified; there are also literatures that deduce the energy functions of the DC system and the AC system. The weighted and defined as the TEF of the AC-DC hybrid power system, this method ignores the dynamic problems of the DC line; the Padiyar method ignores the loss of the DC line, and the TEF analytical expression of the DC line can be obtained; some literatures propose a method that considers the traditional DC transmission line Transient energy function of a dynamic AC / DC hybrid power system structure-preserving model in which the DC transmission line is modeled in detail as an equivalent dynamic load affected by both the converter bus port voltage and the DC line current
The above method has studied and evolved the construction of the energy function of the traditional DC line, but the construction and research of the energy function of the flexible direct current (VSC-HVDC) is not yet perfect, and needs further research

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
  • Judgment method for transient stability of AC/DC hybrid power system with flexible DC
  • Judgment method for transient stability of AC/DC hybrid power system with flexible DC
  • Judgment method for transient stability of AC/DC hybrid power system with flexible DC

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0085] figure 1 It is a schematic flow chart of a method for determining the transient stability of an AC-DC hybrid power system with flexible DC in this embodiment, referring to figure 1 , the method includes:

[0086] S1 establishes a mathematical model of the AC / DC hybrid power system that takes into account the dynamics of the DC line and the transient response of the voltage source converter.

[0087] The mathematical model of AC / DC hybrid power system includes: AC transmission network model, load model, generator model and voltage source (Voltage Source Converter, VSC) converter equivalent model;

[0088] The AC buses in the AC transmission network include n generator buses, m load buses, and l converter buses. The power balance equation on the i-th AC bus is the AC transmission network model as shown in the following formula (1):

[0089]

[0090] in:

[0091]

[0092] P Li and Q Li is the load power on the AC bus; P ei and Q ei is the electromagnetic powe...

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 for judging the transient stability of an AC / DC hybrid power system with flexible DC, comprising: establishing a mathematical model of the AC / DC hybrid power system taking into account the dynamics of the DC line and the transient response of the voltage source converter; Based on the mathematical model of the AC / DC hybrid power system, the transient energy function of the AC / DC hybrid power system with flexible DC under the structure preservation model is constructed, and the energy value of the initial state of the system after a fault is calculated according to the transient energy function; The iterative potential energy boundary surface method is used to calculate the critical energy value of the system; the transient stability of the AC / DC hybrid power system with flexible DC is judged according to the energy value of the initial state of the system after the fault and the critical energy value of the system. This method is based on the transient stability analysis of the AC-DC hybrid system with flexible DC transmission based on the energy function, and can determine the stability of the system quantitatively in real time.

Description

technical field [0001] The invention relates to the technical field of media communication, in particular to a method for judging the transient stability of an AC / DC hybrid power system with flexible DC. Background technique [0002] Voltage Source Converter High Voltage Direct Current (VSC-HVDC) based on Voltage Source Converter is suitable for both small-capacity power transmission and large-capacity power transmission. VSC-HVDC technology is widely used in long-distance large-capacity power transmission, asynchronous networking and other fields. The energy imbalance caused by the transient action of the switch has a more serious impact on the transient stability of the system. In order to avoid the safety and stability risk of the AC-DC hybrid power system due to the VSC-HVDC transient commutation process, it is of great significance to study the transient stability assessment of the two-zone AC-DC hybrid interconnection system with flexible DC. [0003] The traditional ...

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): H02J3/00H02J3/24H02J3/36
CPCH02J3/00H02J3/24H02J3/36Y02E60/60
Inventor 许寅黄天啸和敬涵王丰谢欢吴翔宇刘苗李烜曹天植陈星张秋芳陈瑞罗婧徐鹏王炳辉王晓斐
Owner BEIJING JIAOTONG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com