Battery state-of-health optimization control method for modular multilevel battery energy storage system
A battery energy storage system, modular multi-level technology, applied in secondary battery charging/discharging, secondary battery repair/maintenance, AC network load balancing, etc., can solve problems such as inconsistent battery health status, and reduce differences , Avoid measurement error, the effect of small internal resistance
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[0050] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:
[0051] figure 1 It is a schematic diagram of the grid-connected structure of a modular multi-level battery energy storage system. Modular multilevel converter (ModularMultilevelConverter, MMC), modular multilevel converter includes three-phase bridge arm, each phase bridge arm is composed of upper bridge arm and lower bridge arm, the upper bridge arm and lower bridge arm are composed of Several sub-modules and an inductance element are 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.
[0052] 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 de...
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