Charging method and system

Abstract

The invention discloses a charging method and system, which are applied to an energy storage power station. The charging method comprises the steps of entering a charging monitoring mode when an energy storage bidirectional converter is detected to charge a battery pack; obtaining battery state information, wherein battery state parameters of the battery pack are detected; and performing batterycharging control, wherein whether the detected battery state parameters are within a preset numerical range or not is judged, if yes, the step of obtaining the battery state information is carried out, and if not, a power adjustment instruction is sent to the energy storage bidirectional converter for enabling the energy storage bidirectional converter to reduce charging power after receiving thepower adjustment instruction and charge the battery pack with the reduced charging power; and whether preset charging stop conditions are met or not is judged, if not, the step of obtaining the battery state information is carried out, and if yes, the charging monitoring mode exits and a charging stop instruction is sent to the energy storage bidirectional converter. By adopting the scheme, the influence of a charging process on the cycle service life of the battery pack can be reduced.

Description

technical field [0001] The invention relates to the technical field of charging of energy storage power stations, in particular to a charging method and system. Background technique [0002] With the development of society, energy storage technology is ubiquitous in people's lives, and it plays an extremely important role in the power generation side, transmission side, power distribution side, and power consumption side of the power grid. [0003] At present, the charging method commonly used in energy storage power stations is constant power charging or constant power constant voltage charging. For energy storage power stations using lead-acid batteries When the charging voltage reaches the end-of-charging voltage set by the battery pack terminal of the energy storage power station, the energy storage bidirectional converter switches to constant voltage charging, and the battery continues to charge at this time. This charging method can better solve the problem of insuffic...

AI Technical Summary

Problems solved by technology

[0003] At present, the charging method commonly used in energy storage power stations is constant power charging or constant power constant voltage charging. For energy storage power stations using lead-acid batteries When the charging voltage reaches the end-of-charging voltage set by the battery pack terminal of the energy storage power station, the energy storage bidirectional converter switches to constant voltage charging, and the battery continues to charge at this time. This charging method can better solve the problem of insufficient charging power of the battery pack. However, for energy storage power stations using lithium batteries as battery packs, due to the characteristics of the batteries, if they continue to use constant voltage charging, it will seriously affect the safety performance of the batteries. Therefore, only constant power charging methods can be used, that is, the charging process In this case, if the charging voltage of the battery pack reaches the end-of-charge voltage set by the battery pack end of the energy storage power station, the energy storage bidirectional converter stops charging and turns to a standby state. However, this method will cause the battery pack to be insufficiently charged. Especially for high-power charging energy storage power stations, the effect of insufficient charging power will be more obvious. When the battery pack is in an operating state of insufficient charging power for a long time, it will seriously affect the cycle life of the battery pack.

Since the battery pack accounts for more than 50% of the construction cost of the entire energy storage power station, the existing charging method will lead to a longer investment recovery period of the entire energy storage power station, so an effective charging scheme is very necessary for the normal use of the energy storage power station

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