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The SOC equilibrium and power average control method of DC micro -grid energy storage system

A technology of DC micro-grid and energy storage system, applied in AC network load balance, charge balance circuit, circuit monitoring/indication, etc., can solve problems such as excessive bus voltage drop, achieve power sharing and avoid bus voltage drop Effect

Active Publication Date: 2022-08-05
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

[0004] The invention provides an SOC balance and power sharing control method for a DC microgrid energy storage system, the purpose of which is to solve the problem that the traditional SOC balance control strategy uses droop control combined with low-bandwidth communication, causing the bus voltage drop to be too large

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  • The SOC equilibrium and power average control method of DC micro -grid energy storage system
  • The SOC equilibrium and power average control method of DC micro -grid energy storage system
  • The SOC equilibrium and power average control method of DC micro -grid energy storage system

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Embodiment Construction

[0027] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0028] Aiming at the problem that the existing SOC equalization control strategy adopts droop control combined with low-bandwidth communication, resulting in excessive bus voltage drop, the present invention provides a SOC equalization and power sharing control method for a DC microgrid energy storage system.

[0029] like Figure 1 to Figure 9 As shown, an embodiment of the present invention provides a method for SOC equalization and power sharing control of a DC microgrid energy storage system, including: Step 1, acquiring the state of charge of the first battery and the second battery in real time through low-bandwidth communication step 2, calculate the average value of the state of charge value of the first battery and the second bat...

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Abstract

The present invention provides a method for SOC equalization and power sharing control of a DC microgrid energy storage system, comprising: step 1, acquiring the state-of-charge values ​​of the first battery and the second battery in real time through low-bandwidth communication; step 2, calculating The average value of the state of charge value of the first battery and the second battery; step 3, the state of charge value of the first battery or the state of charge value of the second battery and the average value after making a difference and inputting the first PI The controller, the first PI controller outputs the adjustment amount. The invention effectively avoids the bus voltage drop caused by the droop coefficient, adopts low-bandwidth communication, calculates the average value of SOC of different energy storage units, adopts SOC average value PI closed-loop control, and applies the adjustment amount to the output voltage reference value of the converter, The SOC of each energy storage unit is balanced, and the power is equally shared when the capacity of each group of energy storage units is the same.

Description

technical field [0001] The invention relates to the technical field of DC microgrid operation and control, in particular to a method for SOC equalization and power sharing control of a DC microgrid energy storage system. Background technique [0002] With the increasing global energy and environmental problems, microgrids have received extensive attention from scholars from all over the world. The DC microgrid does not need to consider the problems existing in the AC microgrid such as reactive power and harmonic current, so the research on the DC microgrid is gradually increasing. The continuous increase of DC equipment such as electric vehicles and computers is the trend of future smart grid development. Distributed energy generation is affected by geographical and other factors, resulting in randomness, intermittency and volatility of new energy generation. Direct access to the microgrid system will challenge the stability of the grid. The energy storage unit adopts an e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36H02J3/32H02J3/46H02J7/00H02J7/02
CPCH02J3/36H02J3/32H02J3/46H02J7/0014H02J7/0048H02J7/02Y02E60/60
Inventor 王文周美娜高雄江洪伟王煊博
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY