Power balance method, energy management system and collaborative management system of energy storage system

Abstract

The invention provides a power equalization method, an energy management system and a collaborative management system of an energy storage system. Firstly, the physical parameters of each battery container in the energy storage unit are obtained under the current working condition, and the physical parameters of each battery container are calculated to obtain The voltage change rate and capacity change rate of each battery container; then compare the voltage change rate and capacity change rate of each battery container respectively, and according to the power distribution rule corresponding to the larger one of the voltage change rate and capacity change rate, The power of each battery container in the energy storage unit is allocated; no matter what charging and discharging interval the battery container is in, the power is allocated according to the power allocation rule corresponding to the larger change rate of the voltage and capacity in the interval, thus realizing The optimal selection of the power distribution basis improves the accuracy of power distribution, effectively realizes the balanced management of each battery container, and reduces safety risks.

Description

technical field [0001] The invention belongs to the technical field of electrical engineering, and more specifically relates to a power equalization method of an energy storage system, an energy management system and a collaborative management system. Background technique [0002] With the development of new energy technology, the total power generation of photovoltaic power generation and wind power generation is increasing, and the energy storage technology of large-scale energy storage is developing rapidly, which enables the realization of large-scale energy storage and further realization through large-scale energy storage technology Peak shaving, frequency modulation, peak shaving and valley filling functions. [0003] At present, the structure of a typical energy storage system, such as figure 1 As shown, the energy storage system includes a plurality of energy storage units, wherein the energy storage unit includes an energy management system (Energy Management Syst...

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Problems solved by technology

[0004] for figure 1 The existing power balance distribution scheme of the energy storage system shown is: the voltage or SOC of the battery container is obtained through the BMS in the battery container, and the power is distributed to the battery container according to one of the distribution rules corresponding to the voltage or SOC of the battery container. However, since the voltage and SOC do not show a linear change during the entire charging and discharging process of the battery container, using any one of them as the basis for the power allocation of the entire charging and discharging process cannot ensure accuracy, and thus cannot effectively achieve a Balanced management of each battery container leads to inconsistent status of battery containers in the energy storage system, thereby increasing safety risks

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