Charge-discharge control system and method capable of prolonging service life of energy-storage battery

Abstract

The invention discloses a charge-discharge control system and method capable of prolonging service life of an energy-storage battery. The system comprises a partition module, a power measurement module, an output intensity calculation module, a fuzzy controller, an SOC (state of charge) measurement module, an SOC deviation calculation module, a judgment module, a power correction module, an amplitude limiting module, a load classification module, a power supply insufficiency punishment cost calculation module, a cost comparison module, an annual average cost calculation module, a battery service life calculation module and a charge-discharge depth analysis module. When the SOC of the energy-storage battery approaches an overcharge warning area or an overdischarge warning area in the charging or discharging process, the charge-discharge control system and method are adopted, the charging power of the energy-storage battery is reduced, meanwhile, the SOC approaches an upper limit slowly but does not exceed the upper limit, so that the SOC of the energy-storage battery can be in a normal area to the largest extent, the cycle life of the energy-storage battery is prolonged, and the annual net earning off the system is maximized.

Description

technical field [0001] The invention relates to the technical field of charge and discharge control of energy storage batteries. More specifically, it relates to a charging and discharging control system and method for improving the service life of an energy storage battery. Background technique [0002] In the planning and operation of distributed power generation systems, the cost of energy storage batteries accounts for a large proportion of the entire system cost. The cycle life of the energy storage battery device is limited, and its life span is related to the state of charge (SOC-state of charge) and the depth of discharge (DOD-depth of discharge) of the energy storage battery. The relationship between the cycle life of the energy storage battery device and the depth of discharge is a nonlinear relationship. The larger the depth of discharge, the shorter the cycle life, and the smaller the depth of discharge, the longer the cycle life. There is also a certain relati...

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Problems solved by technology

In the prior art, the charging and discharging control methods for energy storage batteries do not consider the relationship between the SOC of the energy storage battery, the depth of discharge and the cycle life, so it is impossible to ensure the reliability of power supply and the maximum annual income of the system at the same time.

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