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

A droop control method for low-voltage microgrid energy storage system considering unmatched line resistance

A technology of energy storage system and control method, which is applied in the field of micro-grid droop control optimization strategy design, which can solve the problems that SOC cannot achieve balance, does not consider the influence of line impedance and power distribution, and achieves correctness and effectiveness and reduces impact , to avoid the effect of over-discharge

Active Publication Date: 2021-10-08
SHANGHAI UNIVERSITY OF ELECTRIC POWER
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The SOC balance control strategy proposed in the above literature does not consider the line impedance. However, in actual engineering, the mismatched line impedance will have a great impact on the power distribution, resulting in the SOC of the BESU cannot be balanced, especially in the AC micro In the grid
The literature "State of Charge Balance and Voltage Restoration of Distributed Energy Storage Units in Microgrid" (Sun Xiaofeng, Hao Yancong, Wang Baocheng, et al. Proceedings of the Chinese Society for Electrical Engineering, 2016, 36(15): 4047-4054) considers the influence of line impedance on SOC balance impact, while using local pulse train coordinated control to achieve SOC balance and voltage recovery, but lacks the control details to specifically eliminate the impact of line impedance

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 droop control method for low-voltage microgrid energy storage system considering unmatched line resistance
  • A droop control method for low-voltage microgrid energy storage system considering unmatched line resistance
  • A droop control method for low-voltage microgrid energy storage system considering unmatched line resistance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0045] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0046] (1) Traditional P-V droop control principle

[0047] Such as figure 1 As shown, in the low-voltage microgrid, the line impedance is mainly resistive, and the inductive component of the line is ignored at this time, so the active power and reactive power transmission characteristics of the low-voltage microgrid are respectively:

[0048]

[0049]

[0050] V PCC and U are PCC (Point of Common Coupling, common coupling point) and DG unit output voltage amplitude, R L is the equivalent line resistance of the low-voltage microgrid, and δ is the phase angle difference betwee...

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 low-voltage micro-grid energy storage system droop control method considering unmatched line resistance, comprising: a dynamic virtual impedance control step; an SOC droop control step; wherein, when the low-voltage micro-grid energy storage system meets the SOC equilibrium condition , switching from the dynamic virtual impedance control step to the SOC droop control step. Compared with the prior art, the present invention can eliminate the influence of unmatched line impedance on the distribution accuracy of active power, so that the SOC of the island low-voltage microgrid energy storage system is balanced in the traditional droop control discharge process.

Description

technical field [0001] The invention belongs to the technical field of micro-grid droop control optimization strategy design, and in particular relates to a droop control method of a low-voltage micro-grid energy storage system considering unmatched line resistance. Background technique [0002] With the aggravation of energy and environmental problems worldwide, microgrids have received extensive attention from scholars from all over the world. The microgrid is a small and medium-sized power generation and distribution system composed of distributed power sources, loads, energy storage devices, power electronic converters, monitoring and protection devices, etc., and realizes the flexible control of distributed generation (DG). Due to the intermittent and random characteristics of the output power of DG, its safety and reliability are weak. Therefore, it is necessary to increase the battery energy storage system (BESS) to ensure the power balance of the microgrid. The ene...

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): H02J3/38H02J3/32
CPCH02J3/32H02J3/381H02J3/388H02J2203/20
Inventor 米阳蔡杭谊韩云昊符杨陈鑫喻思苏向敬黄玲玲魏书荣
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