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Battery health state optimal control method for modular multi-level battery energy storage system

A battery energy storage system, a modular multi-level technology, applied in the direction of secondary battery charging/discharging, secondary battery repair/maintenance, AC network load balancing, etc., can solve the problem of inconsistent battery health status and narrow the difference , Improve system robustness and avoid measurement errors

Active Publication Date: 2017-06-27
SHANDONG UNIV
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  • Abstract
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Problems solved by technology

[0008] In order to solve the problem of inconsistent battery health status, the present invention proposes a battery health status optimization control method for a modular multi-level battery energy storage system. The operating life of the entire energy storage system also ensures its energy efficiency and output power quality

Method used

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  • Battery health state optimal control method for modular multi-level battery energy storage system
  • Battery health state optimal control method for modular multi-level battery energy storage system
  • Battery health state optimal control method for modular multi-level battery energy storage system

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Embodiment Construction

[0051] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0052] figure 1 It is a schematic diagram of the grid-connected structure of a modular multi-level battery energy storage system. Modular Multilevel Converter (MMC), the modular multilevel converter includes three-phase bridge arms, each phase bridge arm is composed of an upper bridge arm and a lower bridge arm, and the upper bridge arm and the lower bridge arm They are all composed of several sub-modules and an inductance element connected in series; when MMC is used as an energy converter of a power grid-connected system, independent DC power can be connected to each module without a unified DC power supply.

[0053] Each sub-module includes a DC power supply, a filter capacitor, a fuse and a half-bridge switch circuit, the DC power supply is connected in parallel with the capacitor, and is connected in parallel with the capacitor and the switching device;...

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Abstract

The invention discloses a battery state-of-health (SOH) optimization control method for a modular multilevel battery energy storage system, comprising the following steps: determining the relative SOH of all battery packs by measuring the rate of change in state of charge of the battery packs; presetting a state-of-charge change curve of each sub module battery pack; and balancing the SOH of all the battery packs in the charge / discharge state of the energy storage system according to the proportion of real-time input / output power assigned to different battery packs in the total power, and finally narrowing the difference between the battery packs in SOH. When the performance of an individual battery pack decreases, the discharge ratio and the discharge depth of the battery pack can be reduced by controlling corresponding modules of an MMC, and therefore, the battery pack is protected. Moreover, the thermal management requirement of the modular multilevel battery energy storage system is lowered.

Description

technical field [0001] The invention relates to the technical field of optimal control of a battery energy storage system, in particular to a method for optimal control of a modular multi-level battery energy storage system and prolonging the overall life of a battery pack. Background technique [0002] With the rapid development of society and economy, the demand for energy in various countries is increasing day by day. Compared with limited fossil fuels, environmentally friendly new energy sources represented by solar energy and wind energy have renewable characteristics and have broad development prospects. However, the power generation of new energy sources will change with different weather conditions, and has strong intermittent and random fluctuations. Therefore, in order to provide stable power to the grid or users, energy storage systems become indispensable. At the same time, deploying an energy storage system in the power grid is also conducive to improving the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/28H01M10/44
CPCY02E60/10
Inventor 高峰张倩
Owner SHANDONG UNIV
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