Energy storage system efficiency control method and device and energy storage system

Abstract

The invention discloses an energy storage system efficiency control method and device and an energy storage system. The method comprises the following steps: acquiring different charging and discharging efficiencies of an energy storage system under different charging and discharging powers, and constructing a mapping relation curve between the charging and discharging powers and the charging and discharging efficiencies; obtaining a to-be-performed charging and discharging task and calculating the minimum charging and discharging power required for completing the charging and discharging task; and acquiring a corresponding charge-discharge efficiency interval between the minimum charge-discharge power and the preset rated charge-discharge power on the mapping relation curve, and selecting the charge-discharge power corresponding to the maximum charge-discharge efficiency in the interval as the target charge-discharge power. According to the invention, the mapping relation curve between the charging and discharging power and the charging and discharging efficiency is pre-stored in the energy storage system, and the energy storage system uses the mapping relation curve to calculate the target charging and discharging power capable of enabling the charging and discharging efficiency to reach higher target charging and discharging power according to the charging and discharging demand of the charging and discharging task, so that the charging and discharging efficiency of the energy storage system is improved; and the overall benefit of the energy storage system is improved.