Flywheel energy storage and lithium battery composite energy storage system and working method thereof

Abstract

The invention discloses a flywheel energy storage and lithium battery composite energy storage system and a working method thereof, and belongs to the technical field of energy storage. The system comprises a DC-AC module, a combined energy storage management system, DC-DC modules, a lithium ion battery energy storage unit and a flywheel energy storage unit. The lithium ion battery energy storage unit and the flywheel energy storage unit are respectively and correspondingly connected with DC-DC modules, all DC-DC modules are connected in parallel and then are connected with the combined energy storage management system, the combined energy storage management system is connected with the DC-AC module, and the DC-AC module is connected with an external power grid. Advantages of flywheel energy storage and the lithium battery can be brought into full play, parts borne by the flywheel energy storage and the lithium ion battery energy storage in different application scenes are optimized, performance advantages of the composite energy storage system are reasonably and efficiently matched and brought into full play, the peak and frequency modulation capacity of the energy storage system under complex conditions is greatly improved, and the defects of a single energy storage system are overcome.

Description

technical field [0001] The invention belongs to the technical field of energy storage, and in particular relates to an energy storage system combined with a flywheel energy storage and a lithium battery and a working method thereof. Background technique [0002] In recent years, with the support of national policies and continuous technological progress, new energy sources such as wind power and photovoltaics have grown rapidly, and the installed capacity has far exceeded the local consumption capacity, resulting in more abandoned wind and light in some areas. Renewable energy sources such as photovoltaics are intermittent and volatile, resulting in a continuous decline in grid regulation and anti-interference capabilities, which poses a series of major challenges to the consumption of new energy on the grid and the stable operation of the grid. The use of energy storage devices can effectively manage the fluctuations and uncertainties associated with high proportions of win...

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Problems solved by technology

[0005] In order to solve the above existing problems, the object of the present invention is to provide a flywheel energy storage and lithium battery composite energy storage system and its working method, which can give full play to the advantages of flywheel energy storage and lithium battery, and greatly improve the energy storage system. The ability of peak regulation and frequency regulation under complex conditions solves the shortcomings of a single energy storage system

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