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

Abstract

The invention provides a power balancing method, an energy management system and a collaborative management system of an energy storage system; the physical parameters of each battery container in anenergy storage unit under the current working condition are obtained, and the physical parameters of each battery container are calculated, and the voltage change rate and the capacity change rate ofeach battery container are obtained; then, the voltage change rate and the capacity change rate of each battery container are compared separately, and a power distribution rule corresponding to the relatively large one of the voltage change rate and the capacity change rate is adopted for distributing the power of each battery container in the energy storage unit; and no matter the battery container is located in any one charging and discharging area, the power distribution rule corresponding to the relatively large one of the voltage change rate and the capacity change rate in the area is adopted for distributing power, so that the optimal selection of the power distribution basis is realized, the power distribution accuracy is improved, the balance management for each battery container is effectively realized, and the safety risk is reduced.

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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