Energy storage system operation optimization control method for prolonging service life of lithium battery

Abstract

The invention relates to an energy storage system operation optimization control method for prolonging the service life of a lithium battery. The energy storage system operation optimization control method is characterized by including the steps of according to experimental data of the maximum charging-discharging circulation time number of an energy storage battery under different charging-discharging depths, defining the charging-discharging circulation depth corresponding to the time when the maximum electric quantity can be handled under the different charging-discharging circulation depths in the service life cycle of the battery to be the standard charging-discharging circulation depth of the battery, and building a service life attenuation degree evaluation index of the battery under frequent and random charging-discharging occasions according to the degree of the battery operating charging-discharging circulation depth deviated from the standard charging-discharging depth. If a single battery energy storage system is used for completing the task of stabilizing contribution fluctuations, due to the randomness of wind power contributions and photovoltaic contributions, the battery operating charging-discharging circulation depth can not reach the standard charging-discharging depth. Based on the fact, the dual-battery energy storage unit main circuit structure and the coordination control strategy are designed, battery units are allowed to operate under the standard charging-discharging depth, and the energy storage life of the battery is prolonged to the maximum degree.

Description

technical field [0001] The invention relates to an operation optimization control method of an energy storage system for improving the service life of a lithium battery. Background technique [0002] Wind power generation has become an important choice to realize the sustainable development of low-carbon electricity due to its many advantages such as no pollution, primary energy can be used permanently and so on. However, due to the randomness, intermittentness and unpredictability of wind energy, large-scale wind power grid integration will inevitably bring many challenges to the operation, dispatch and control of the power system. Therefore, from the perspective of safe and economic operation of the power grid, how to improve the controllability of large-scale wind power is an urgent problem to be solved for wind power grid integration. [0003] Energy storage system is considered to be an effective means to improve the controllability of intermittent power supply and imp...

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Problems solved by technology

[0004] In order to solve the above-mentioned problems when battery energy storage is applied to new energy access, the present invention provides an energy storage system operation optimization control method that improves the life of lithium batteries, which solves the problem of frequent charge-discharge conversion and incomplete battery energy storage operation. The problem of adverse impact on battery energy storage life when the charge and discharge cycle is in operation

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