Dynamic voltage sharing circuit of storage battery in energy storage and frequency modulation system and control method of dynamic voltage sharing circuit

Abstract

The invention relates to a storage battery, and further relates to a dynamic voltage sharing circuit of a storage battery in an energy storage and frequency modulation system and a control method of the dynamic voltage sharing circuit, The dynamic voltage sharing circuit of the storage battery in the energy storage and frequency modulation system comprises a first storage battery 1, a second storage battery 2, a third storage battery 3, a fourth storage battery 4, a switch device K1, a switch device K2, a switch device K3, a switch device K4, a switch device K5, a switch device K6, a switch device K7, a switch device K8 and a dual-winding high-frequency transformer 5. Compared with the prior art, the dynamic voltage sharing circuit has the beneficial effects that the four storage batteriesare connected in series to generate a DC voltage with a certain rated voltage, voltage sharing control among the four storage batteries employs a topological structure proposed by the invention, energy exchange among the storage batteries can be achieved, and voltage sharing control is rapidly achieved.

Description

Technical field: [0001] The invention relates to a storage battery, and further relates to a dynamic voltage equalizing circuit and a control method of the storage battery in an energy storage frequency modulation system. Background technique: [0002] The battery is used as the energy storage medium in the energy storage frequency modulation system, and the voltage of the battery cell is generally below 4V. For example, the voltage of a lithium battery cell is 3.3V, and the voltage of a lead-acid battery cell is 2V. Generally, multiple battery cells are connected in series to increase the overall voltage of the battery pack. For example, for a battery pack with a terminal voltage of 400V, more than 100 lithium battery cells need to be connected in series. In order to ensure the consistency of charge and discharge of the cells, it is necessary to screen the cells of the lithium battery, and select the cells with the same parameters and characteristics for series connection, ...

AI Technical Summary

Problems solved by technology

And when the number of battery cells connected in series is large, it is difficult to guarantee the parameter consistency of the cells throughout the life cycle. Once some of the cells are damaged or their characteristics are degraded, the available electric energy storage capacity of the entire battery pack will be greatly reduced. decline or even lead to overall failure

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