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

A DC Microgrid Power and Voltage Regulation Method Considering Line Impedance and Local Load

A local load and line impedance technology, applied in the direction of DC network circuit devices, DC power supply parallel operation, electrical components, etc., can solve the problems of high selection requirements, bus voltage deviation, etc., to achieve stable output voltage, improve efficiency, and increase load Effect of Power Distribution Accuracy

Active Publication Date: 2021-12-07
SHANGHAI UNIVERSITY OF ELECTRIC POWER
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The literature "Yang Jie, Jin Xinmin, Wu Xuezhi, et al. An improved current load distribution control strategy for DC microgrid [J]. Chinese Journal of Electrical Engineering, 2016, 36(1): 59-67" proposed a A droop control strategy that uses the voltage change rate instead of the voltage to realize the precise distribution of the load current, but there is still a large deviation in the bus voltage
The literature "Jiang Weiming, Zhao Jinbin, Gao Mingming, et al. Research on the control strategy of independent DC microgrid with voltage self-recovery characteristics [J]. Grid Technology, 2019.1315: 1-9" obtains line impedance information through the method of single pulse injection, and It is introduced into the droop coefficient in the form of negative compensation to suppress the adverse effects of line impedance inconsistency on current distribution, but this strategy has high requirements for the selection of measurement interval time after pulse injection

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 DC Microgrid Power and Voltage Regulation Method Considering Line Impedance and Local Load
  • A DC Microgrid Power and Voltage Regulation Method Considering Line Impedance and Local Load
  • A DC Microgrid Power and Voltage Regulation Method Considering Line Impedance and Local Load

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0043] In this example, the overall structural model of the microgrid, the analysis of the load power distribution error between DGs under the traditional droop control strategy, the analysis of the equivalent circuit model including local loads, the improved droop power distribution strategy, the voltage recovery control strategy, and different working methods based on MATLAB The present invention will be further described in several aspects such as the calculation example verification under the condition.

[0044] (1) Microgrid structure model

[0045] A typical DC microgrid structure such as figure 1 As shown, it includes a common DC bus, distributed power sources (including energy storage units) and different types of loads, and each unit is connected in parallel to the common DC bus through corresponding converters. At the same time, the DC microgrid can also be connected to the external AC grid through a grid-connected converter.

[0046] When the external AC grid fail...

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 present invention relates to a DC micro-grid power and voltage regulation method considering line impedance and local load. The method is used in the island operation mode of the DC micro-grid. The DC micro-grid contains multiple sets of DGs and different types of loads, each The DGs are connected in parallel to the common DC bus through the corresponding converters. This method uses an improved droop control strategy to make each DG distribute load power according to its rated capacity, eliminate the influence of line impedance and local load on power distribution, and maintain the bus voltage. Stablize. Compared with the prior art, the power distribution control and voltage recovery control strategy of the island DC microgrid proposed by the present invention can effectively improve the load power distribution accuracy among parallel multiple distributed power sources in the island DC microgrid, and improve the efficiency of distributed power sources. Efficiency, give full play to the "plug and play" feature of DG. At the same time, maintaining the DC bus voltage enables the microgrid system to operate stably.

Description

technical field [0001] The invention relates to a coordinated output power control and bus voltage stabilization of a DC microgrid connected in parallel to a common DC bus, in particular to a DC microgrid power and voltage regulation method considering line impedance and local load. Background technique [0002] Considering the current environmental pollution and the shortage of fossil fuels, distributed power generation technology based on renewable energy sources (RES) has been proposed and widely used. Connecting distributed generation (DG) to the distribution network in the form of a microgrid is generally considered to be one of the effective ways to utilize distributed generation. Traditionally, microgrids are divided into DC microgrids and AC microgrids according to the type of access bus. Compared with the AC microgrid, the DC microgrid has no problems such as phase and reactive power, which makes the voltage distribution independent of the inductance and capacitanc...

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): H02J1/00H02J1/10
CPCH02J1/00H02J1/10
Inventor 米阳马宇辰韩云昊常俊飞李振坤姜恩宇赵耀王育飞刘蓉晖
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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