Converter modular design and control method matched with battery grouping application

A technology of modular design and control method, which is applied in the direction of current collectors, battery circuit devices, electric vehicles, etc., can solve problems such as uneven current and circulation between battery packs, performance degradation of energy storage systems, and damage to battery characteristics, and achieve improved The effect of device efficiency, optimized operation mode and great versatility

Inactive Publication Date: 2012-02-15
BEIJING SIFANG JIBAO AUTOMATION +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the past battery applications, in order to meet the system requirements, batteries are often operated in parallel. Due to the differences in the differences and the complexity of the on-site environment, there will be unev

Method used

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  • Converter modular design and control method matched with battery grouping application
  • Converter modular design and control method matched with battery grouping application
  • Converter modular design and control method matched with battery grouping application

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Embodiment Construction

[0020] The technical solution of the present invention will be further described in detail below according to the drawings in the description and in combination with specific implementation examples.

[0021] figure 1 Shown is the main circuit diagram of the converter power module used in the present invention.

[0022] The power module in the converter of the present invention is composed of a three-arm power unit formed by an insulated gate bipolar transistor IGBT and an LCL filter. One end of the LCL filter is connected to the output of the three-arm power unit, and the other end of the LCL filter is connected to the output of the three-arm power unit. One end is connected to the external AC busbar, and the DC side of the three-bridge arm is connected to the battery pack after parallel connection of filter capacitors.

[0023] figure 1 As shown in , Cdc represents the DC bus filter capacitor; Udc represents the DC bus voltage, that is, the battery pack port voltage; La1 a...

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Abstract

The invention discloses a converter modular design and control method matched with battery grouping application. When power modules of a converter carry out grid-connected operations, independent constant power charge/discharge control of each power module can be realized through alternating current side active/reactive power decoupling by adopting grid voltage oriented vector control and voltage space vector pulse width modulation methods. When the converter operates, given N is the number of battery groups connected with the converter in parallel, and when the difference between the power instruction sent by the upper grid dispatcher and the rated power of the converter is greater than 1/N of the rated power of the converter, the states of charges of the batter groups are taken as the power allocation basis and the operation strategy of timesharing rotation and dynamic dormancy is adopted. The method has the following effects that: the problem of circular current caused by direct parallel use of the batteries can be thoroughly solved; the system loss can be reduced and the efficiency and electric energy quality of the converter device can be improved; and the method has good generality, practicability and an application prospect.

Description

technical field [0001] The invention belongs to the technical field of converter design for large-capacity energy storage power stations, and is suitable for the modular design and control of converters matching the application of large-capacity batteries in groups. Background technique [0002] As the future development direction of my country's power grid, smart grid will carry out technical improvements on all aspects of power grid operation. Energy storage technology, especially large-scale battery energy storage technology, is an indispensable key content of the smart grid. Due to its own characteristics, it will be widely used in the four major links of power generation, power transmission, power distribution, and power consumption. In 2007, the State Grid Corporation of China put forward the framework of "Research on key technologies of energy conversion---research on key technologies of energy storage" and made careful deployment. Based on the research direction of ...

Claims

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Application Information

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IPC IPC(8): H02J7/10
Inventor 刘树刘志超操丰梅梅红明刘建政王皆庆何岩陈秋荣将丙魁刘红媛
Owner BEIJING SIFANG JIBAO AUTOMATION
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