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Modular design method of large-capacity battery energy storage system

A technology of battery energy storage system and modular design, which is applied in the direction of electric energy storage system, flexible AC transmission system, battery circuit device, etc.

Inactive Publication Date: 2013-04-03
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The collection of a large number of energy storage batteries poses a huge challenge to the operation, maintenance and management of the system

Method used

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  • Modular design method of large-capacity battery energy storage system
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  • Modular design method of large-capacity battery energy storage system

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Experimental program
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Effect test

Embodiment approach 1

[0019] Implementation Option 1: Application Mode of Peak Shaving and Valley Filling

[0020] In the application mode of peak shaving and valley filling, the typical capacity of the energy storage system is several hundred kW-tens of MW, and the time is 2-4h. This implementation plan takes the 1MW / 4MWh energy storage system as an example to carry out the scheme design.

[0021] The 1MW / 4MWh energy storage system is composed of one 1MW / 4MWh energy storage circuit, and each energy storage circuit is composed of four 250kW / 1MWh energy storage branches. The grid circuit breaker is connected to the 35kV busbar, such as Figure 4 shown.

[0022] The 250kW / 1MWh energy storage unit adopts a 250kW two-stage energy storage converter and five parallel 200kWh battery strings. The topology is as follows: Figure 5 shown. Each 200kWh battery string is composed of 180 3.2V / 360Ah unit batteries in series, with a working voltage range of 450-657V and a rated voltage of 576V. The compositio...

specific Embodiment approach 2

[0023] Specific implementation plan 2: new energy access application mode

[0024] In the new energy access mode, the energy storage system is used in conjunction with large-scale wind farms or photovoltaic power generation to smooth the output of wind power and photovoltaic power generation and improve the grid's ability to accept new energy. The typical capacity of the energy storage system is several MW-hundreds of MW, and the time is 2-4h. This implementation plan takes the 10MW / 20MWh energy storage system as an example for scheme design.

[0025] The 10MW / 20MWh energy storage system consists of five 2MW / 4MWh energy storage circuits, and each energy storage circuit consists of four 500kW / 1MWh energy storage branches. The grid circuit breaker is connected to the 35kV busbar, such as Figure 6 shown.

[0026] The 500kW / 1MWh energy storage unit adopts a 500kW two-stage energy storage converter and ten parallel 100kWh battery strings. The topology is as follows: Figure 7 ...

specific Embodiment approach 3

[0027] Specific implementation plan 3: application mode of peak regulation and frequency regulation

[0028] In the peak-shaving and frequency-regulating power station application mode, the energy storage system compensates the grid for active or reactive power, which can improve the power quality of the grid. The typical capacity of the energy storage system is tens of MW to hundreds of MW, and the time is 15 minutes to 1 hour. This implementation plan takes the 20MW / 5MWh energy storage system as an example to design.

[0029] The 20MW / 5MWh iron-lithium battery energy storage system consists of ten 2MW / 0.5MWh energy storage circuits. Each energy storage circuit is connected to the 400V bus, and connected to the 35kV bus through a 0.4 / 35kV step-up transformer unit, such as Figure 8 shown.

[0030] The 20MW / 5MWh iron-lithium battery energy storage system consists of 10 2MW / 0.5MWh energy storage circuits, and each energy storage circuit consists of 4 energy storage branches....

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Abstract

The invention discloses a modular design method of a large-capacity battery energy storage system which is defined into power MW level and comprises an energy storage battery, a battery management system, an energy storage converter, a monitoring system and the like. According to a modular design idea, the large-capacity battery energy storage system is reduced to an energy storage unit, an energy storage branch and an energy storage loop according to the hierarchy, wherein the energy storage unit is a basic module of an energy storage system and comprises an energy storage pile and an energy storage converter. According to the function division of the large-capacity energy storage system, the invention relates to specific applications under a peak load shaving mode, a new energy access mode and a peak-shaving frequency modulation mode, and comprises definition, composition, power / capacity design, topological structures, access modes and energy storage unit parameter design of all levels of structures in the energy storage system. The large-capacity battery energy storage system has the advantages of clear structure, well arrangement and favorability of operation and maintenance of a primary system and energy management and control of a secondary system, and the like.

Description

technical field [0001] The invention belongs to the technical field of electric power storage, and relates to a modular design method of a large-capacity battery energy storage system level and an energy storage battery body level. Background technique [0002] Large-capacity battery energy storage systems can be applied in the power generation, transmission and transformation links of smart grids. In the power generation link, the typical power of the energy storage system is more than tens of MW, and the storage time is tens of minutes to several hours. The impact of the large power grid improves the power grid's ability to accept new energy power generation; in the transmission link, the power of the energy storage system is MW to tens of MW, and the storage time is 15min to 4h. Give full play to the frequency regulation and voltage regulation of the power grid, and support the power grid to realize the role of active and reactive power dispatching; in the substation lin...

Claims

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Application Information

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IPC IPC(8): H02J15/00H02J7/02H02J3/32
CPCY02E40/10
Inventor 阮前途吴福保杨波叶季蕾薛金花何维国张宇
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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