Battery energy storage system and control method based on single battery pack

Abstract

The invention relates to a storage battery energy-storage system based on single accumulator batteries. The storage battery energy-storage system comprises a power supply bus and a plurality of single accumulator batteries which are connected with the power supply bus, wherein each single accumulator battery comprises a battery jar, a micro bidirectional transducer, a micro battery control device and a storage battery which is arranged in the battery jar, wherein the storage battery is connected with the power supply bus by the micro bidirectional transducer and controlled by the micro battery control device. According to the storage battery energy-storage system disclosed by the invention, the utilization rate of the stored energy, the reliability and the compatibility of the system can be improved based on the single accumulator batteries. Correspondingly, the invention further discloses a method for controlling the storage battery energy-storage system based on the single accumulator batteries, so that the power supply efficiency can be effectively improved while the power supply is guaranteed. Moreover, unnecessary electric energy waste is avoided, and the service life of the batteries is ensured.

Description

technical field [0001] The invention relates to a battery energy storage system and a control method based on a single battery pack. Background technique [0002] With the development of the national economy, the demand for electricity is growing rapidly, and the scale of the power grid is continuously expanding. customized power supply needs. With the development of power electronics technology, the power system gradually tends to be miniaturized and distributed, and a new term - microgrid has emerged. [0003] The microgrid is composed of a series of loads and micro power sources, and it is a single controllable system that provides power and heat for its area. It is a system composed of distributed energy sources and their loads according to a certain topology, which better realizes distributed Advantages of generating electricity. At present, AC microgrids are widely used, but compared with AC microgrids, DC microgrids have the following obvious advantages: [0004] ...

AI Technical Summary

Problems solved by technology

Such a battery energy storage system is called a "centralized battery energy storage system". Although such a system is relatively mature at present, it has many defects: (1) The system needs to consider the voltage equalization problem between battery packs; (2) High cost of production process; (3) Overcharge / overdischarge of battery pack; (4) Poor system compatibility; (5) Low system reliability; (6) Low system energy utilization

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