Battery energy storage system based on modular multilevel AC-AC (Alternating Current-Alternating Current) converter topology

A modular multi-level, battery energy storage system technology, applied in flexible AC power transmission systems, AC power input conversion to AC power output, electrical components and other directions, can solve the problem of large module volume and weight, increase module assembly difficulty, protection , maintenance and replacement inconvenience and other issues, to achieve the effect of less energy conversion, low cost and small weight

Active Publication Date: 2013-08-07
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since multiple energy storage battery packs are scattered and placed in different modular units, it is necessary to perform complex balancing control on the state of charge of each battery pack, and the scattered placement of a large number of batteries makes protection, maintenance and replacement more inconvenient
In addition, because each module unit contains a battery, the module volume and weight are relatively large, which increases the difficulty of module assembly

Method used

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  • Battery energy storage system based on modular multilevel AC-AC (Alternating Current-Alternating Current) converter topology
  • Battery energy storage system based on modular multilevel AC-AC (Alternating Current-Alternating Current) converter topology
  • Battery energy storage system based on modular multilevel AC-AC (Alternating Current-Alternating Current) converter topology

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0024] figure 1 It is a structural diagram of the battery energy storage system based on the modularized multi-level AC-AC converter of the present invention. Such as figure 1 As shown, the energy storage system is composed of a modular multilevel three-phase AC / single-phase AC converter 1 , a single-phase high-frequency isolation transformer 2 , a single-phase rectifier 3 and an energy storage battery pack 4 . The modular multi-level three-phase AC / single-phase AC converter 1 is connected to the power grid through the grid-connected inductor 5 and the starting circuit 6, and the grid-connected inductor 5 and the starting circuit 6 are connected in series in the modular multi-level three-phase AC / single-phase Between AC converter 1 and the grid. The grid-side three-phase AC power is connected to the three-phase input side of the modular mult...

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Abstract

The invention relates to a battery energy storage system based on a modular multilevel AC-AC (Alternating Current-Alternating Current) converter topology. The battery energy storage system comprises a modular multilevel three-phase AC / single-phase AC converter (1), a single-phase high-frequency insulating transformer (2), a single-phase rectifier (3) and an energy storage battery pack (4), wherein the three-phase input side of the modular multilevel three-phase AC / single-phase AC converter (1) is connected with a power grid, the single-phase AC output end of the modular multilevel three-phase AC / single-phase AC converter (1) is connected with the primary side of the single-phase high-frequency insulating transformer (2), the secondary side of the single-phase high-frequency insulating transformer (2) is connected with the single-phase rectifier (3), and the DC (Direct Current) side of the single-phase rectifier (3) is connected with the energy storage battery pack (4).

Description

technical field [0001] The invention relates to a battery energy storage system applied to a medium voltage power system. Background technique [0002] At present, with the increasing grid-connected capacity of new energy power generation, the intermittence and volatility of new energy itself have an increasing impact on the stability of the power grid. In order to stabilize the power fluctuations of new energy power generation, a feasible solution The solution is to add an energy storage system. [0003] In the field of low-voltage power grids, due to the advantages of sufficient withstand voltage and simple structure of power electronic switching devices, energy storage systems usually adopt two-level topology. In medium and high voltage power grids, the three-phase two-level topology cannot be directly adopted due to the limitation of the withstand voltage performance of the current power electronic devices. There are two strategies for outputting high voltage, one is t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/32H02M5/297H02M5/293
CPCY02E40/10
Inventor 殷正刚唐西胜
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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