An energy storage multi-working-condition operation control method and device for an energy router

A technology of operation control and energy storage control, applied in circuit devices, battery circuit devices, transportation and packaging, etc.

Active Publication Date: 2021-07-06
JIANGSU ELECTRIC POWER CO +5
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, when the energy storage enters the constant voltage charging mode, if there is a practical need for discharging at this time, how to seamlessly switch back to the constant current discharging mode is also a major difficulty
Existing literature has conducted some research on energy storage from constant current mode to constant voltage mode, but there is a lack of comprehensive research on seamless switching between the two

Method used

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  • An energy storage multi-working-condition operation control method and device for an energy router
  • An energy storage multi-working-condition operation control method and device for an energy router
  • An energy storage multi-working-condition operation control method and device for an energy router

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Experimental program
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Embodiment

[0089] Take the three-port energy router as an example, such as figure 2 As shown, before 3.5s, the energy storage has been working in the constant current charging mode, the charging current remains unchanged, and the energy storage SOC gradually increases, as shown in image 3 shown. At this time, the photovoltaic output is completely absorbed by the energy storage, and the VSC (Voltage Source Converter, voltage source grid-connected converter) current is basically zero, such as Figure 4 shown. Due to the symmetry of the three-phase current, select C-phase voltage (reduced by 200 times) and C-phase current as a comparison description. As the energy storage SOC increases, its terminal voltage also gradually increases. At 3.5s, the energy storage port voltage reaches the critical value V t , the energy storage is switched from constant current charging mode to constant voltage charging mode. Since the output of the constant voltage control loop tracks the constant curre...

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Abstract

The invention discloses an energy storage multi-working-condition operation control method and device for an energy router, including adding a current tracking loop to the traditional voltage droop control loop, so that the energy storage can transmit any power within the capacity range, thereby realizing power control. Precise distribution; based on state following, seamless switching between energy storage constant current mode and constant voltage mode is realized, thereby realizing flexible control of energy storage and ensuring the power quality of the DC bus when the mode is switched.

Description

technical field [0001] The invention discloses an energy storage multi-working-condition operation control method and device for an energy router, belonging to the technical field of multi-working-condition coordinated control of an energy router. Background technique [0002] In the multi-port energy router, the energy storage device is a key device, which not only improves the local consumption of renewable energy, but also improves the operational reliability of the system. Therefore, it is a hot spot to study how to design the charging and discharging control strategy of energy storage. Existing research mainly focuses on controlling the charging and discharging of energy storage to control the DC bus voltage stability and maintain system power balance. Although this is very beneficial to the reliable operation of the energy router, it lacks the consideration of the operation of the energy storage itself. In practice, as the state of charge (SOC) gradually approaches th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J1/10H02J7/34H02J3/32
CPCH02J1/10H02J3/32H02J7/34
Inventor 肖宇华韦斌黄健孙广明张卫国陈良亮顾琳琳陈嘉栋杨凤坤周材邵军军余洋李化刘永相
Owner JIANGSU ELECTRIC POWER CO
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