Two-level charge-discharge system

A technology for charging and discharging batteries, applied in the field of bidirectional power conversion systems, which can solve the problems of simple operation mode, small capacity, and short power support time

Active Publication Date: 2012-07-25
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a two-stage charging and discharging system, which solves the problems of small capacity, short power support time and simple operation mode existing in the existing two-stage charging and discharging system, and realizes multi-mode and highly reliable operation

Method used

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Embodiment Construction

[0133] Such as figure 1 As shown, the embodiment of the present invention includes a bidirectional AC-DC converter, a controller, and N sets of bidirectional DC converters. The controller generates the first to sixth driving signals and sends them to the bidirectional AC-DC converters, the controller generates the seventh to (6+2N) driving signals and sends them to N bidirectional DC converters, and N bidirectional DC converters The output terminals of the inverters are respectively used to connect N groups of batteries, and coordinately control the bidirectional AC-DC converters and N sets of bidirectional DC converters. The AC bus can pass through the grid-connected switch K as needed g Connection to grid or via local switch K L Connect to local load.

[0134] Such as figure 2 As shown, the controller includes a mode judgment module, an island operation module, a grid-connected discharge module, a grid-connected charging module, a segmented constant current charging mod...

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Abstract

A two-level charge-discharge system belongs to bidirectional power transformation systems and solves the problem that an existing two-level charge-discharge system is low in capacity, short in power supporting time and simple in operating mode. The two-level charge-discharge system comprises a bidirectional direct-current and alternating-current converter, a controller and N bidirectional direct-current converters. The bidirectional direct-current and alternating-current converter is in parallel connection with input ends of the N bidirectional direct-current converters through a direct-current bus, and output ends of the N bidirectional direct-current converters are connected with N groups of batteries respectively. The controller comprises a mode judging module, an island operating module, a synchronous discharging module, a synchronous charging module, a segmented constant-current charging module and a constant-current and constant-voltage charging module. Driving signals generated by the controller are transmitted to the bidirectional direct-current and alternating-current converter and the N bidirectional direct-current converters respectively. The two-level charge-discharge system is high in capacity, rich in operating modes, high in reliability, capable of realizing five operating modes including island operating, synchronous discharging, synchronous charging, segmented constant-current charging and constant-current and constant-voltage charging, and applicable to megawatt-level power accumulation systems.

Description

technical field [0001] The invention belongs to a bidirectional power conversion system, in particular to a two-stage charging and discharging system, which is suitable for the application of a megawatt-level power energy storage system. Background technique [0002] Large-scale battery energy storage power stations have the characteristics of fast switching of working conditions, flexible operation, high efficiency, safety and environmental protection, low operation and maintenance costs, short construction period, and strong scalability. They can be used to support the terminal voltage of the grid and improve the power quality of the grid. The load realizes uninterrupted power supply, and it can also realize load handling after its scale reaches a certain level. The key to the construction of large-scale battery energy storage power stations lies in large-scale charging and discharging technology. Large-scale charging and discharging technology includes energy storage carr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/02H02J7/10
Inventor 段善旭陈昌松蔡涛刘宝其方支剑
Owner HUAZHONG UNIV OF SCI & TECH
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