Angle type modularized electric energy storage system

Abstract

The invention discloses an angle type modularized electric power energy storage system, which comprises a first phase energy storage conversion module, a second phase energy storage conversion module and a third phase energy storage conversion module, the input end of the first-phase energy storage conversion module is connected with the output end of the third-phase energy storage conversion module, and the output end of the first-phase energy storage conversion module is connected with the input end of the second-phase energy storage conversion module; and the output end of the second-phase energy storage conversion module is connected with the input end of the third-phase energy storage conversion module. Each phase energy storage conversion module comprises a filtering device and a plurality of energy storage sub-modules. According to the angular modularized electric energy storage system provided by the embodiment of the invention, the low-voltage modularized cascade module is adopted for energy storage, the direct parallel connection of the battery clusters and the limitation of the difference between the battery clusters on the output of the energy storage system are avoided, the available energy is utilized to the maximum extent, and the manufacturing cost of the electric energy storage system is reduced.

Description

technical field [0001] The invention relates to the technical field of electrochemical energy storage, in particular to an angular modular electric energy storage system. Background technique [0002] Electrochemical energy storage refers to the conversion of electrical energy into chemical energy and other forms of energy and storage, and then converted into electrical energy and released when needed. The electrochemical energy storage system can be applied to the power generation, transmission, distribution and consumption of the power system, and can play an important role in the efficient and stable operation of the power system. On the power generation side, energy storage technology solves the randomness and volatility of new energy power generation to a large extent, effectively adjusts the changes in grid voltage and frequency caused by new energy power generation, and enables new energy power generation to be connected to the grid flexibly and friendly. Ancillary s...

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Problems solved by technology

[0003] At present, the battery clusters in the electrochemical energy storage system are directly connected in parallel. Due to the difference in the consistency of the battery itself, the current deviation between the clusters may result, resulting in a difference in capacity, which limits the output of the energy storage system.

In addition, due to the high voltage level of the AC side of the PCS, such as 6~35kV, the insulation level of the battery cluster is high and the design is difficult; the high insulation level requires a large electrical clearance, which reduces the energy density of the battery cluster

The connecting cables between the H-bridge modules need to match the voltage level of the AC side, and the insulation level is high, so the cost is also high

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