Battery energy storage system with reactive adjusting function

Abstract

The invention provides a battery energy storage system 10 with a reactive adjusting function. The system 10 comprises a renewable energy power generation device 12, a storage battery module 13, a static var generator (SVG) module 14, a first alternating current/direct current (AC/DC) two-way conversion current module 16, a DC bus, a second AC/DC two-way conversion current module 15 and a monitoring device 11, the first AC/DC two-way conversion current module 16 is used for connecting and isolating the energy storage system 10 and a power distribution network 20, and the second AC/DC two-way conversion current module 15 is used for connecting the renewable energy power generation device 12 and the DC bus. The battery energy storage system with the reactive adjusting function has the advantages that change conditions of output power of the renewable energy power generation device can be correctly predicted, a control strategy gives consideration to power distribution network dispatch requirements and energy storage system operation conditions, active power and reactive power can be provided for the power distribution network simultaneously, the dispatch requirements of the power distribution network can be met, meanwhile, power supply reliability is achieved, the safety of the energy storage system is guaranteed, and the service life of the energy storage system is prolonged.

Description

Technical field [0001] The invention relates to a battery energy storage system with reactive power adjustment function. Background technique [0002] In recent years, under the dual pressure of energy demand and environmental protection, distributed power generation technology represented by photovoltaic, wind power and gas power generation has developed rapidly. Moreover, the emerging concept of microgrid has also been proposed along with the widespread use of distributed energy. However, due to the natural discontinuity of distributed energy sources, the stability of the system is gradually being threatened. In order to give full play to the advantages and benefits of renewable energy power generation, balance its random fluctuations, maintain system stability, improve power quality, and provide uninterrupted Power supply functions, etc., must be equipped with a certain capacity energy storage unit in the system at the same time. [0003] In the application of micro-gri...

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Problems solved by technology

[0004] However, the cost of energy storage is high. Considering the economic cost of microgrid operation, the life of energy storage should be extended as much as possible while ensuring the safe operation of the microgrid system

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