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

Hybrid energy storage frequency division control method considering unbalanced current change rate of direct current microgrid

A technology of DC microgrid and control method, applied in parallel operation of DC power supply, collectors, electric vehicles, etc., can solve the problems of reduced reliability and slow response speed of hybrid energy storage system, so as to reduce current stress and improve system reliability. Sexuality, the effect of improving recovery speed

Active Publication Date: 2019-07-26
SOUTH CHINA UNIV OF TECH
View PDF5 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this decomposition method does not consider that due to the slow dynamic response speed of the battery, the power with a high rate of change cannot be compensated, resulting in a slow response speed of the entire hybrid energy storage system; at the same time, this method needs to rely on the communication device to collect the power information of each unit. Reduced reliability

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
  • Hybrid energy storage frequency division control method considering unbalanced current change rate of direct current microgrid
  • Hybrid energy storage frequency division control method considering unbalanced current change rate of direct current microgrid
  • Hybrid energy storage frequency division control method considering unbalanced current change rate of direct current microgrid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0037] The implementation of the present invention will be described in further detail below in conjunction with the accompanying drawings. But the implementation of the present invention is not limited thereto.

[0038] The hybrid energy storage frequency division control method considering the unbalanced current change rate of the DC microgrid provided in this embodiment can be realized on the MATLAB / Simulink simulation platform, as shown in figure 1 As shown, the DC microgrid includes a photovoltaic power generation system (PV), a DC bus, loads (R L ), a first DC-DC bidirectional converter, a second DC-DC bidirectional converter, a single-phase Boost converter, and a hybrid energy storage system (HESS) composed of batteries and supercapacitors; among them, the photovoltaic power generation system (PV) is The single-phase Boost converter is connected to the DC bus, the storage battery is connected to the DC bus through the first DC-DC bidirectional converter, the supercapac...

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 hybrid energy storage frequency division control method considering unbalanced current change rate of a direct current microgrid. The method is mainly based on a traditionalfrequency division control method, a current change rate limit link is added, and the total current needing to be balanced by the hybrid energy storage system is decomposed into a high-change-rate current component, a low-change-rate instantaneous current component and a low-change-rate average current component; the sum of the high-change-rate current component and the low-change-rate instantaneous current component serves as the output reference current of a supercapacitor, and the low-change-rate average current component serves as a storage battery output reference current. The defect thata battery cannot track the high-change-rate current due to the slow dynamic response characteristic of the battery is overcome, the current stress borne by the battery is reduced, and the service life of the battery is prolonged; the distribution of unbalanced current is finer and more accurate, the recovery speed of the direct current bus voltage is increased, and the overshoot of bus voltage isreduced; and only the direct current bus voltage needs to be detected, the power information of each unit is not needed, and the requirement for communication is lowered.

Description

technical field [0001] The invention relates to the technical field of hybrid energy storage system control, in particular to a hybrid energy storage frequency division control method considering the unbalanced current change rate of a DC microgrid. Background technique [0002] The output power of the renewable energy power generation system has the characteristics of intermittent, fluctuating and random. Therefore, in the process of connecting to the grid or applying to the micro-grid, it is necessary to configure the energy storage system to smoothly control its output power. Batteries have high energy density but slow dynamic response and effective charge and discharge times. Supercapacitors have high power density and cycle life but low energy density. Therefore, these two energy storage elements are commonly used to form a hybrid energy storage system. The most common control method adopted for this hybrid energy storage system is the frequency division control strateg...

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): H02J1/10H02J7/34
CPCH02J1/10H02J7/345
Inventor 杜贵平张宇涵雷雁雄
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