A kind of energy control method and energy storage system

Abstract

The present application provides an energy control method and an energy storage system. The energy storage converter in the energy storage system is connected to N first energy storage devices, and is connected to M second energy storage devices one by one through M DC converters. equipment. In the energy control method, firstly, the preset converter among the M DC converters in the energy storage system balances the SOC between the first energy storage device and the second energy storage device; and the energy storage The general controller in the system controls the average power of each energy storage device; then, each DC converter controls its own operating power according to the above-mentioned balanced adjustment results and power average control results, thereby realizing SOC balanced adjustment and power The decoupling of the average control realizes the compatible management of the first energy storage device and the second energy storage device, improves the reliability of the control in the energy storage system; and also ensures the fast response and maximum output capacity of the energy storage system .

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to an energy control method and an energy storage system. Background technique [0002] Usually, the internal structure of the energy storage system exists in two forms, one such as Figure 1a As shown, multiple batteries are directly connected in parallel to the DC side of the energy storage converter; another such as Figure 1b As shown, multiple batteries are first connected in series with their respective DC converters, and then connected in parallel to the DC side of the energy storage converter. [0003] In the prior art, in order to meet the capacity expansion requirements of the energy storage system, the simplest expansion method is to directly connect devices of the same type in parallel on the DC side of the energy storage converter; however, the above two energy storage systems have corresponding problems after capacity expansion. It is impossible to meet the ...

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Problems solved by technology

[0003] In the prior art, in order to meet the expansion requirements of the energy storage system, the simplest expansion method is to directly connect the same type of device in parallel on the DC side of the energy storage converter; however, there are corresponding problems after the expansion of the above two energy storage systems. It cannot meet the expansion requirements of the energy storage system in practical applications, therefore, a situation such as figure 2 In the energy storage system shown, the new battery is first connected in series with its own DC converter, and then connected in parallel to the DC side of the energy storage converter

[0004] However, the existing DCDC converter parallel system usually adopts master-slave control or droop control, for figure 2 The structure of the energy storage system shown is still unable to achieve compatible management of old and new batteries, which will affect the effective use of battery performance

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