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Modularized medium-voltage energy storage system

An energy storage system and modularization technology, applied in the field of medium voltage energy storage system and modular energy storage system, can solve the problems of significant short-board effect of batteries, inability to guarantee long-term stable operation, high DC side voltage of power converters, etc., to achieve The effects of small current harmonics, low cost, and low capacity requirements

Inactive Publication Date: 2014-07-02
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Considering that the efficiency of single-stage power converter is <98%, the efficiency of two-stage power converter is <96%, the loss of transformer is 2%, and the total efficiency of energy storage system is <96% and <94%, respectively, the system efficiency is low
[0006] The voltage on the DC side of the power converter of ABB’s energy storage system is too high, which requires an extremely large number of batteries to be used in series. The short board effect of the battery is significant. The existing battery balancing technology Can not guarantee its long-term stable operation

Method used

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  • Modularized medium-voltage energy storage system
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  • Modularized medium-voltage energy storage system

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Embodiment

[0024] This embodiment is a 2MW battery energy storage system with a rated voltage of 10kV.

[0025] Such as image 3 As shown, the power module of this embodiment includes: 1 battery pack, 1 resistor, 1 contactor, 4 IGBTs and 1 set of capacitors. There are 11 energy storage units in each of the three phases A, B, and C, according to figure 2 The way of connection constitutes the entire medium-voltage energy storage system.

[0026] In this embodiment, the rated voltage of one storage battery unit is 1200V, and the nominal capacity is 400Ah.

[0027] In this embodiment, the pre-charging circuit is composed of a resistor R1 and a contactor K1. Among them: R1 and K1 are connected in parallel. One end of the resistor R1 and the contactor K1 is connected to the positive pole of the battery pack, which is the input end of the pre-charging circuit; the other end of the resistor R1 and the contactor K1 is the output end of the pre-charging circuit. The resistance value...

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Abstract

The invention discloses a modular medium-voltage energy storage system, which includes an energy storage battery unit, a pre-charging circuit, a single-phase H-bridge converter and a connecting inductor, wherein the output end of the energy storage battery unit is connected to the input end of the pre-charging circuit To transmit DC voltage, the output terminal of the pre-charging circuit is connected to the DC terminal of the single-phase H-bridge converter to transmit DC voltage, thus forming an energy storage unit, and the AC side of each energy storage unit in the three phases is connected in series, and one end is a modular medium voltage The other end of the neutral point of the energy storage system is connected to the connecting inductor, and the other end of the connecting inductor is connected to the grid to form the three phases of the medium voltage energy storage system. Under the same power, the present invention has high voltage, low current, and small current harmonics, and has low requirements on the capacity of battery cells; redundancy can be realized through bypasses, and reliability is high; and it has the function of balancing batteries. The cost of the MW-level large capacity is lower than that of the high-voltage solution.

Description

technical field [0001] The invention relates to a modular medium-voltage energy storage system, in particular to a modular energy storage system adopting a cascade structure, which is used in large-capacity battery energy storage occasions. It belongs to the field of battery energy storage. Background technique [0002] The use of battery energy storage to smooth wind power and photovoltaic power generation is an effective way to solve the difficulty of new energy grid connection and the problem of "abandoning wind" of wind power. The application of large-scale battery energy storage in the power grid will change the history that electric energy can only be transmitted but not stored, will have a revolutionary impact on the production and operation of the power grid, and will greatly promote the development of my country's smart grid. [0003] The battery energy storage system uses an AC / DC bidirectional power converter to realize the bidirectional flow of power between the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J15/00H02J7/00H02J7/02
Inventor 凌志斌
Owner SHANGHAI JIAOTONG UNIV