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Dynamic hybrid energy storage control strategy based on supercapacitor and lithium battery SOC

A supercapacitor and dynamic hybrid technology, which is applied in current collectors, electric vehicles, battery overcharge protection, etc., can solve problems such as overcharge and overdischarge, long program running time, and inability to quickly track hybrid energy storage power commands, etc., to achieve The effect of improving the service life

Inactive Publication Date: 2019-04-09
STATE GRID JIANGSU ECONOMIC RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of overcharging and overdischarging, the actual reference power of the battery and supercapacitor is not considered, which may still lead to overcharging and overdischarging.
In the high-pass filter time constant control process, the fixed step length change method is adopted, which will cause problems such as too long program running time and inability to quickly track the hybrid energy storage power command.

Method used

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  • Dynamic hybrid energy storage control strategy based on supercapacitor and lithium battery SOC
  • Dynamic hybrid energy storage control strategy based on supercapacitor and lithium battery SOC
  • Dynamic hybrid energy storage control strategy based on supercapacitor and lithium battery SOC

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Embodiment Construction

[0020] Embodiments of the patent of the present invention are described in detail below in conjunction with the accompanying drawings.

[0021] Such as figure 1 As shown, a structure model of photovoltaic microgrid with hybrid energy storage is built. The hybrid energy storage module and the photovoltaic power generation module are connected to the DC bus through the DC / DC converter, and then connected to the AC grid through the DC / AC inverter. Among them, DC / DC adopts reference power control, and DC / AC adopts constant voltage and constant frequency control.

[0022] Such as figure 2 Shown is the overall flow chart of hybrid energy storage control. The power distribution module uses the high-pass filter time constant to modify the time constant T output by the module for power distribution, and outputs the distribution result to the overcharge and overdischarge coordination protection and maximum power limit protection module; overcharge and overdischarge coordination prot...

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Abstract

The invention belongs to the fields of energy storage of new energy and energy storage and optimization of electric power systems, and relates to a dynamic hybrid energy storage control strategy basedon a supercapacitor and lithium battery SOC; and the power instructions of a hybrid energy storage system are reasonably distributed among energy storage elements. According to the control strategy,the fluctuation condition of the charging and discharging power of a storage battery can be effectively stabilized, the service life of the storage battery is prolonged, and for any situation, the over-charging and over-discharge protection of the energy storage device can be effectively completed; and meanwhile, the hybrid energy storage control strategy has the characteristic of being high in response speed.

Description

technical field [0001] The patent of this invention relates to the control strategy of dynamic hybrid energy storage based on supercapacitor and lithium battery SOC, specifically, it involves the coordination of power distribution and overcharge and overdischarge protection of the hybrid energy storage control system, which belongs to new energy storage and electric power System energy storage optimization field. Background technique [0002] With the increasingly serious environmental pollution caused by the burning of fossil fuels and the increasing demand for energy, countries around the world have reached a consensus on the development and utilization of renewable energy. However, renewable energy such as wind energy and solar energy has the characteristics of strong intermittency and large volatility, which leads to a decrease in the power quality and reliability of the power generation system. In order to solve this problem, an energy storage device is introduced into...

Claims

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Application Information

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IPC IPC(8): H02J7/34H02J15/00
CPCH02J7/0029H02J7/345H02J15/00H02J7/00302H02J7/00306
Inventor 李妍高玲张慧媛
Owner STATE GRID JIANGSU ECONOMIC RES INST