Multi-machine parallel autonomous control device and multi-machine parallel autonomous control method for battery energy storage system

A battery energy storage system and energy storage system technology are applied in the field of multi-machine parallel autonomous control devices of battery energy storage systems, and can solve the problems of inability to realize plug-and-play of battery energy storage systems, large power and frequency fluctuations, etc.

Pending Publication Date: 2019-08-16
CHINA ELECTRIC POWER RES INST +1
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Problems solved by technology

When the battery energy storage system is connected in parallel with multiple machines in the microgrid, there will be large power and frequency fluctuations when the battery

Method used

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  • Multi-machine parallel autonomous control device and multi-machine parallel autonomous control method for battery energy storage system
  • Multi-machine parallel autonomous control device and multi-machine parallel autonomous control method for battery energy storage system
  • Multi-machine parallel autonomous control device and multi-machine parallel autonomous control method for battery energy storage system

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[0042] The specific embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0043] Such as figure 2 As shown, a multi-machine parallel autonomous control device for a battery energy storage system, the topology of the battery energy storage system is as follows figure 1 Shown.

[0044] The circuit topology of the control device is based on the traditional three-phase bridge circuit, and the autonomous fast current sharing control method samples the voltage and current output by the respective battery energy storage system itself, requiring a total of 6 sampling branches. The sampled signal is calculated by the DSP digital processing chip through the transformer and the conditioning circuit. The DSP digital processing chip obtains the modulation signal according to the control method proposed by the present invention, and then drives the IGBT (DC / AC power conversion of the three-phase bridge circuit through the ...

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Abstract

The invention provides a multi-machine parallel autonomous control device and a multi-machine parallel autonomous control method for a battery energy storage system. The multi-machine parallel autonomous control device comprises a converter main circuit connected with a multi-machine parallel energy storage system, and an upper computer and a digital signal processor which are mutually connected with the converter main circuit; and the upper computer is connected with the digital signal processor through the RS232, and is configured to issue a control instruction to the multi-machine parallelenergy storage system according to the received micro-grid voltage and output power sent by the multi-machine parallel energy storage system under frequency modulation control. The micro-grid voltagesof the multi-machine parallel energy storage system in twice frequency modulation control are detected in real time, and when the voltage of the micro-grid exceeds the limit, the excitation voltage control is executed to allow each battery energy storage system to rapidly connect into the micro-grid so as to meet the requirement of plug and play. When the power output between the multi-machine parallel energy storage systems has difference, virtual impedance is added to achieve power sharing.

Description

technical field [0001] The invention relates to the field of battery energy storage system control, in particular to a multi-machine parallel autonomous control device and method for a battery energy storage system. Background technique [0002] At present, there are two main aspects that restrict the development of the battery energy storage system industry: one is the battery itself, and the other is the power converter. With the development of battery technology, high-power converter systems have become a current research hotspot. The use of high-power battery energy storage systems can improve the ability of the power grid to cut peaks and fill valleys, and accept the power of wind power and photovoltaics, which meets the development requirements of smart grids. [0003] In the prior art, the power converters of the high-power energy storage system are often modularized and paralleled when expanding capacity due to the performance limitations of components. When multip...

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Application Information

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IPC IPC(8): H02J3/32
CPCH02J3/32
Inventor 闫涛胡娟惠东徐少华牛萌渠展展
Owner CHINA ELECTRIC POWER RES INST
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