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Bidirectional multi-mode hybrid energy storage circuit

A hybrid energy storage, multi-mode technology, applied in the direction of circuit devices, battery circuit devices, collectors, etc., can solve the problems of unfavorable high energy density and high power density, complex structure and control, high configuration cost, etc., to avoid frequent charging discharge, simple structure and low cost

Pending Publication Date: 2020-04-17
中国能源建设集团天津电力设计院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the configuration cost of the active energy storage system is high, and the structure and control are complicated. The DC / DC converter is affected by the power demand, and the configuration is relatively large, which is not conducive to the realization of high energy density and high power density.

Method used

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  • Bidirectional multi-mode hybrid energy storage circuit
  • Bidirectional multi-mode hybrid energy storage circuit
  • Bidirectional multi-mode hybrid energy storage circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Energy-type energy storage element directly supplies power to the load mode: open the controllable switches K1, K2, K3, and close the switch K4.

[0043] When the hybrid energy storage system is applied to occasions that require energy recovery, the hybrid energy storage system should ensure that as much energy is recovered as possible to avoid waste. When the power type energy storage element is fully charged and energy recovery is no longer possible, power will be supplied to the energy type energy storage element. The hybrid energy storage system works in working mode 1, such as figure 2 As shown, in this mode, the controllable switches K1, K2, and K3 are disconnected, K4 is closed, and the bidirectional DC / DC converter stops working.

Embodiment 2

[0045] The power type energy storage element directly supplies power to the load mode: open the controllable switches K1, K2, K4, and close the switch K3.

[0046]When the hybrid energy storage system is applied to occasions that require energy recovery, the hybrid energy storage system should ensure that as much energy is recovered as possible to avoid waste. When the SOC of the power type energy storage element is high, the energy type energy storage element is not needed to charge the power type energy storage element through a bidirectional DC / DC converter. Combined power supply works in working mode 2, such as image 3 As shown, in this mode, the controllable switches K1, K2, and K4 are opened, K3 is closed, and the bidirectional DC / DC converter stops working.

Embodiment 3

[0048] The power type energy storage element supplies power to the load through a bidirectional DC / DC converter. Mode: open the controllable switches K1, K3, K4, and close the switch K2.

[0049] When the hybrid energy storage system is discharging, the working mode of the hybrid energy storage system is judged according to the typical characteristics of the load power demand. When the power demand of the load is not large and changes drastically, and the SOC of the power-type energy storage element is at a high level, the energy storage system works in working mode 3, such as Figure 4 shown. In this mode, the controllable switches K1, K3, K4 are open and K2 is closed. In this mode, the power-type energy storage element is solely responsible for the power demand of the load through the bidirectional DC / DC converter. Using the power-type energy storage, it has the ability to charge and discharge with high power in a short period of time. It can charge and discharge more times...

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PUM

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Abstract

The invention relates to a bidirectional multi-mode hybrid energy storage circuit. The circuit comprises an energy type energy storage element BAT, a power type energy storage element C, switch groupsK1, K2, K3 and K4, an inductor L, a bidirectional DC / DC converter D and a load R, one end of the positive electrode of the energy type energy storage element is connected with the positive input endof the bidirectional DC / DC converter through a first switch K1; the other end of the positive electrode of the energy type energy storage element is connected with the positive output end of the bidirectional DC / DC converter through the inductor L and the fourth switch K4 in sequence; one end of the positive electrode of the power type energy storage element is connected with the positive input end of the bidirectional DC / DC converter through the second switch K2, and the other end of the positive electrode of the power type energy storage element is connected with the positive output end of the bidirectional DC / DC converter through the third switch K3. The negative electrodes of the energy type energy storage element and the power type energy storage element are jointly connected with thenegative input end of the bidirectional DC / DC converter. According to the invention, full utilization of the power type energy storage element is realized, and the service life of the energy storagesystem is prolonged.

Description

technical field [0001] The invention belongs to the technical field of power systems, and relates to an energy storage circuit in the power system, in particular to a bidirectional multi-mode hybrid energy storage circuit. Background technique [0002] At present, in the power system, the energy storage system has the characteristics of real-time absorption and release of energy, and improves the quality of electric energy. It can usually be divided into two types: energy-based energy storage technology and power-based energy storage technology. Energy-based energy storage technology has the advantages of high energy density and long energy storage time, but the power density is small and the cycle life is short, so it is not suitable for compensating short-term pulse power fluctuations, such as batteries, lithium batteries, pumped water storage, compressed air energy storage, etc. . Power-type energy storage components have the advantages of high power density, fast respon...

Claims

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Application Information

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IPC IPC(8): H02J1/14H02J7/34
CPCH02J1/14H02J7/34
Inventor 刘建伟李学斌赵号刘剑王明王侃陈世龙马麟刘建鹏吴伟铭
Owner 中国能源建设集团天津电力设计院有限公司
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