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

DC side stability analysis method suitable for multi-terminal DC power transmission system

A transmission system, multi-terminal DC technology, applied in the power field, can solve problems such as difficulty in analyzing the impact of DC side stability, and inability to provide analysis criteria for DC power grids.

Active Publication Date: 2021-03-16
HANGZHOU ELECTRIC EQUIP MFG +2
View PDF2 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional input impedance method and eigenvalue analysis method can judge the stability of the system through numerical calculation, but its disadvantages are that it cannot give the analytical criteria for the stability of the DC power grid, and it is also difficult to analyze the impact of system parameters, control parameters and system operating conditions on the DC power grid. side stability

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
  • DC side stability analysis method suitable for multi-terminal DC power transmission system
  • DC side stability analysis method suitable for multi-terminal DC power transmission system
  • DC side stability analysis method suitable for multi-terminal DC power transmission system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0063] In order to facilitate those skilled in the art to better understand the present invention, the present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. The following is only exemplary and does not limit the protection scope of the present invention.

[0064] Such as figure 1 As shown, the DC side stability analysis method applicable to the multi-terminal DC transmission system described in this embodiment includes the following steps:

[0065] Step S1, establishing a mathematical model of the multi-terminal direct current transmission system under droop control.

[0066] In this embodiment, it is assumed that the AC side is in an ideal state and the inner loop current control is ignored, so the mathematical model only includes the system equations and control equations of the DC side, such as figure 2 shown;

[0067] The system equation of the DC side is:

[0068] (1)

[0069] (2)

[0...

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 discloses a DC side stability analysis method suitable for a multi-terminal DC power transmission system, and the method comprises the steps: S1, building a mathematic model, including aDC side system equation and a control equation, of the multi-terminal DC power transmission system under the action of droop control; S2, linearizing a steady-state operation point of the multi-terminal DC power transmission system to obtain a linearized stability analysis model of the mathematical model, and obtaining a transfer function between a direct-current variable quantity and a direct-current voltage variable quantity after the multi-terminal DC power transmission system is disturbed; S3, deriving a DC stability criterion of the multi-terminal DC power transmission system based on the transfer function; S4, judging whether a droop parameter set under the current electrical parameter is in a stable range of the multi-terminal direct-current power transmission system or not based on a stability criterion; if the droop parameter exceeds the stable range, adjusting a controller parameter and / or changing an operation point of the DC power transmission system; otherwise, requiringno processing. The method achieves the quick discrimination of the stability of a DC power grid, and facilitates the design or adjustment of the parameters of the controller by a power system operator.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a DC side stability analysis method applicable to a multi-terminal DC transmission system. Background technique [0002] In recent years, with the development of multi-terminal DC transmission (multi-terminal, MTDC) systems, converters based on droop control have attracted extensive attention from scholars and power technicians at home and abroad. Droop control can conveniently realize the power distribution of the DC grid, and is expected to become the mainstream control strategy for multi-terminal DC system converters. But at the same time, the power fluctuation of the grid, the unreasonable design of the controller parameters, and the mutual coupling between the DC transmission network and the controller will bring a series of challenges to the stable operation of the DC grid. Analyzing and judging the stability of the DC power grid under droop control has become a ke...

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 Applications(China)
IPC IPC(8): H02J3/36
CPCH02J3/36H02J2203/20Y02E60/60
Inventor 江奕军洪昊姜坤徐寅飞李佳朋姜建李宇骏宋佳王芳何雨微徐坤婷卢家驹
Owner HANGZHOU ELECTRIC EQUIP MFG
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