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

A Method for Existence and Stability Analysis of Power Flow Solution in DC Distribution System

A technology of DC power distribution and analysis method, applied in the direction of AC network circuits, circuit devices, AC networks with the same frequency with different sources, etc. Achieve accurate upper limit of load, reduce conservatism, and achieve a wide range of effects

Active Publication Date: 2020-02-04
SOUTH CHINA UNIV OF TECH +1
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the scale of the DC power distribution system is large, there are many loads, and the line impedance is high, due to line loss, as the load increases, the system may lose its balance point, resulting in voltage collapse, which cannot be controlled by the above methods voltage 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
  • A Method for Existence and Stability Analysis of Power Flow Solution in DC Distribution System
  • A Method for Existence and Stability Analysis of Power Flow Solution in DC Distribution System
  • A Method for Existence and Stability Analysis of Power Flow Solution in DC Distribution System

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Provided is a method for analyzing the existence and stability of power flow solutions of DC power distribution systems. The DC power distribution system is a network structure composed of n converter nodes and m load nodes. The converter nodes and load nodes connected, adjacent load nodes are electrically connected; the analysis method includes the following steps:

[0053] S10. Using graph theory, perform equivalent topology on the DC power distribution system to obtain the transmission network admittance matrix Y; according to Ohm's law, obtain the current injected into the transmission network by each node [i s ,i L ] T , where i s is the output current of the converter node, i L Current injected into the network for load nodes;

[0054] S20. When the converter is under droop control, calculate and obtain the output voltage u s the expression;

[0055] S30. Based on the output voltage u S The expression of the constant power load and the volt-ampere character...

Embodiment 2

[0089] This embodiment is an application example of Embodiment 1. In this embodiment, a DC power distribution system including 10 converters and 20 loads is built. The converter nodes are marked with numbers 1-10, and the load nodes are marked with numbers 11-20. , the resistance between the converter node and the load node, and the resistance between the load nodes are marked in figure 1 middle. This embodiment provides six calculation examples and a comparative calculation example:

[0090] Calculation example 1: Assume that the maximum load vector of the DC power distribution system is P max =10 4 [10 10 10 10 10 8 8 8 88 10 10 10 10 10 10 12 12 12 12] T W, take the sag coefficient as k 1 =k 2 =...=k 10 =2. Then, when the voltage of the converter satisfies Equation (7), the system has a power flow feasible solution. take v 1 =v 2 =…=v 10 =2463V.

[0091] Calculation example 2: The maximum load vector is the same as the calculation example 1, take v 1 =v 2 =24...

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 relates to the technical field of power running and in particular to an existence and stability analysis method for a power flow solution of a DC power distribution system. The existenceand stability analysis method comprises the steps of performing equivalent topology on the DC power distribution system to obtain an admittance matrix Y of a power transmission network; acquiring a current, injected to the power transmission network, of each node; calculating an output voltage us when a converter is in droop control; obtaining an expression of a steady-state working point of theDC power distribution system and a power flow equation of the DC power distribution system according to an expression of the output voltage us and voltage current characteristic of a constant-power load; and calculating the power flow solution by an iterative algorithm and by combining a feasible sufficient condition T of the DC power distribution system. The existence of the power flow solution of the system after load access and voltage abrupt change can be rapidly estimated according to an existence condition of a numerical value-type system, and the running state of the DC power distribution system is obtained; and moreover, the characteristic of a circuit system is fully utilized, a closed nested interval-based method is proposed, and the existence condition of the power flow solutionwith lower conservative property is obtained.

Description

technical field [0001] The invention relates to the technical field of electric power operation, and more specifically, to a method for analyzing the existence and stability of a power flow solution of a DC power distribution system. Background technique [0002] With the increase in the proportion of DC power sources such as photovoltaics and energy storage batteries, as well as DC loads such as electric vehicles and data service stations, the application demand for DC power distribution systems will increase. At present, domestic research on distribution networks is mainly concentrated on AC distribution networks. Compared with AC distribution networks, DC distribution networks have the following advantages: less conversion links, low conversion loss rate and high reliability; no reactive power, High transmission efficiency; no frequency synchronization problem, easier to connect renewable energy to the grid and system stability. Therefore, the DC power distribution syste...

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): H02J3/06
CPCH02J3/06H02J2203/20
Inventor 刘尧管霖郑建平谭喆陈建福杨昆柳张杰裴星宇
Owner SOUTH CHINA UNIV OF TECH
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