Hierarchical control method and system for energy storage device

An energy storage device, layered control technology, applied in circuit devices, AC network load balancing, reducing/preventing power oscillation, etc., can solve the problem of the decrease in the available capacity of the energy storage system, the different available capacity of the energy storage units, and the reduction of the frequency regulation economy. and other problems, to achieve the effect of avoiding the phenomenon of unbalanced work, avoiding irreversible damage, and using it accurately and rationally.

Pending Publication Date: 2022-05-13
STATE GRID JIANGSU ELECTRIC POWER CO ZHENJIANG POWER SUPPLY CO +1
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the differences in the energy storage unit itself, the temperature difference and other factors, the available capacity of the energy storage unit will be different. The energy storage unit with a small capacity will be fully charged first when charging, and empty first when discharging, thus restricting other energy storage systems in the energy storage system. The charge and discharge capacity of the unit causes the available capacity of the energy storage system to decrease; while the principle of the energy storage system participating in frequency regulation in the prior art 1 is that the state of charge reaches 100%, and according to the rated capacity of the energy storage system, the current state of charge and 100% % difference to determine the charging capacity that can participate in frequency regulation. In practical applications, the charging capacity allocated to the energy storage system in the frequency regulation control strategy cannot be fully absorbed by the energy storage system, resulting in the adjustable power allocated to the unit side. Too low to meet the actual demand for frequency regulation, resulting in secondary frequency regulation, reducing the economy of frequency regulation

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
  • Hierarchical control method and system for energy storage device
  • Hierarchical control method and system for energy storage device
  • Hierarchical control method and system for energy storage device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0104] The application will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present invention more clearly, but not to limit the protection scope of the present application.

[0105] The energy storage device includes multiple energy storage units, and the energy storage device participates in frequency regulation under the frequency fluctuation of the power grid.

[0106] Such as figure 1 , a hierarchical control method for an energy storage device, comprising:

[0107] Step 1: Collect the frequency change rate and frequency deviation of the current power grid; collect the state of charge of each energy storage unit, and extract the maximum value and minimum value of the state of charge of each energy storage unit.

[0108] In step 1, collect and sort the state of charge of each energy storage unit in ascending order, and obtain the maximum state of charge SOC of each...

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 hierarchical control method and system for an energy storage device. The method comprises the following steps: collecting a frequency change rate, a frequency deviation and a charge state of each energy storage unit; determining whether the energy storage device participates in frequency modulation according to the frequency change rate, the allowable value, the frequency deviation and the allowable value; when participating in frequency modulation, determining the frequency modulation power of each energy storage unit participating in frequency modulation according to the frequency modulation power direction, the maximum value and the minimum value of the state of charge in each energy storage unit and the frequency fluctuation degree coefficient; the first n energy storage units in the charge state sequence of the energy storage units are taken, and if the absolute value of the sum of the frequency modulation power of the first n energy storage units is not smaller than the absolute value of the reference frequency modulation power of the energy storage device, the first n energy storage units participate in frequency modulation; if the absolute value of the sum of the frequency modulation power of all the energy storage units is smaller than the absolute value of the reference frequency modulation power of the energy storage device, all the energy storage units participate in frequency modulation. Balanced management of the energy storage units with different charge states is realized, and the service life of the energy storage device can be maintained.

Description

technical field [0001] The present invention relates to the technical field of energy storage control, and more specifically, to a hierarchical control method and system for an energy storage device. Background technique [0002] Frequency is one of the key indicators of power grid quality. The dynamic balance of power load and power generation is an important guarantee for grid frequency stability. Therefore, changes in grid frequency also directly reflect the balance of power supply and demand. When the power generation is greater than the power load, the grid frequency increases; otherwise, the power load is greater than the power generation, and the grid frequency decreases. Wind power is clean, low-carbon and relatively mature technology, and its grid-connected capacity is increasing year by year. However, the current mainstream wind turbine rotor speed is decoupled from the system frequency, so it does not have frequency response capability, which brings great challen...

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): H02J3/48H02J3/24H02J3/32
CPCH02J3/48H02J3/241H02J3/32
Inventor 龚一平李相俊张子阳姜倩王晨晖修晓青张楠吴旭左帆李静陈永明
Owner STATE GRID JIANGSU ELECTRIC POWER CO ZHENJIANG POWER SUPPLY CO
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products