Unlock instant, AI-driven research and patent intelligence for your innovation.

Hybrid energy storage autonomous frequency division energy management method

A hybrid energy storage and energy management technology, which is applied in parallel operation of DC power supplies, electric vehicles, electrical components, etc. Extend service life and improve dynamic response

Active Publication Date: 2018-07-20
HUNAN UNIV
View PDF4 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The intermittent power output of distributed power generation devices and the variability of loads may lead to problems such as unbalanced system supply and demand, DC bus voltage fluctuations, and poor power quality, which makes energy storage an indispensable and important link in DC microgrids.

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 autonomous frequency division energy management method
  • Hybrid energy storage autonomous frequency division energy management method
  • Hybrid energy storage autonomous frequency division energy management method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] figure 1 It is a structural diagram of a DC micro-grid system according to an embodiment of the present invention, including a photovoltaic module, a hybrid energy storage module, a power electronic converter and a load; the output of the photovoltaic module is connected to the DC bus through a Boost circuit; the hybrid energy storage module consists of a supercapacitor and a battery The output is connected to the DC bus through a Buck / Boost circuit; the load is simulated by a DC / DC converter and a resistive load.

[0018] figure 2 It is a hybrid energy storage circuit and its control diagram, the battery is connected to the load through a bidirectional DC / DC1 converter, and the terminal voltage at both ends of the battery is U b , bidirectional DC / DC1 consists of inductance L 1 and switch tube S 1 , S 2 , and its parasitic diode D 1 、D 2 Composition; the supercapacitor is connected to the load through a bidirectional DC / DC2 converter, wherein the terminal voltag...

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 autonomous frequency division energy management method. The hybrid energy storage autonomous frequency division energy management method is characterized in that an energy storage capacitor and an energy storage battery complement the advantages of each other and the dynamic features of hybrid energy storage can be improved and optimal utilization ofenergy can be realized, by introducing virtual resistance-inductance and a virtual capacitor control loop into sagging control of each energy storage unit, changing the equivalent output impedance value of each converter, and reducing the influence of the system parameters and the voltage current double loop control on the equivalent output impedance values of the converters through reasonable parameter design so as to enable the equivalent output impedance values to show resistance-inductance features in a low frequency domain and show capacitance in a high frequency domain; when sudden loadchange occurs, the super capacitor quickly take actions to absorb the high frequency part of the system instantaneous power to improve dynamic response of the system; and the storage battery balancesthe low frequency part of power fluctuation, thus prolonging the service life and guaranteeing reliable operation of the system.

Description

technical field [0001] The invention relates to the technical field of DC microgrid energy storage control, in particular to an autonomous frequency division energy management method of a hybrid energy storage module composed of an energy storage battery with high energy density and an energy storage capacitor with high power density. Background technique [0002] With the increasingly serious energy crisis and environmental pollution, renewable and pollution-free new energy sources have received extensive attention and research. As a key technology for integrating renewable distributed power generation systems, energy storage devices and loads into controllable sub-networks, microgrids can work in grid-connected or isolated systems. Compared with AC microgrid, DC microgrid has the advantages of simple structure, less energy conversion times, no need to consider frequency, phase and reactive power compensation equipment, and high power supply quality, which promotes the rapi...

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
CPCH02J1/10H02J7/34H02J7/345
Inventor 陈燕东谭文娟周小平周乐明伍文华杨苓谢志为王伊罗安
Owner HUNAN UNIV