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Bidirectional multiport non-isolated DC converter and control method thereof

A technology of a DC converter and a control method, which is applied in the direction of conversion equipment without intermediate conversion to AC, can solve the problems of high-voltage DC system-to-ground insulation, capacity DC conversion system redundancy, etc.

Active Publication Date: 2016-03-23
STATE GRID CORP OF CHINA +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the DC microgrid technology, the DC converter plays a very important role. The bidirectional DC converter can realize the bidirectional transmission of energy. The polarity of its input and output voltage remains unchanged, but the direction of the input and output current can be changed; while

Method used

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  • Bidirectional multiport non-isolated DC converter and control method thereof
  • Bidirectional multiport non-isolated DC converter and control method thereof
  • Bidirectional multiport non-isolated DC converter and control method thereof

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Embodiment 1

[0090] Such as Figure 1-7 As shown, the inventive bidirectional multi-port non-isolated DC converter of this example includes at least two DC converter modules one of which is connected to the microgrid; the DC converter module includes two series-connected upper tubes module, a lower tube module, a capacitor C1 connected in parallel with the upper tube module, and a capacitor C2 connected in parallel with the lower tube module; the upper tube module includes an upper tube switch T1 and a lower tube switch T2 connected in series, and the lower tube The switch T2 is connected in parallel with the capacitor C3; the lower tube module includes the upper tube switch T3 and the lower tube switch T4 in series, and the upper tube switch T3 is connected in parallel with the capacitor C4.

[0091] The upper tube switch T1 is a switch and connected in antiparallel with the diode D1; the lower tube switch T2 is switched and connected in antiparallel with the diode D2; the upper tube swit...

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Abstract

The invention relates to a bidirectional multiport non-isolated DC converter and a control method thereof. The DC converter comprises at least two DC converter modules, and one end of each DC converter module is connected with a micro power grid; each DC converter module comprises an upper diode module, a lower diode module, a capacitor C1 connected with the upper diode module in parallel and a capacitor C2 connected with the lower diode module in parallel, and the upper diode module and the lower diode module are connected in series; the upper diode module comprises an upper diode switch T1 and a lower diode switch T2 which are connected in series, and the lower diode switch T2 is connected with a capacitor C3 in parallel; and the lower diode module comprises an upper diode switch T3 and a lower diode switch T4 which are connected in series, and the upper diode switch T3 is connected with a capacitor C4 in parallel. The control method comprises a positive bus voltage control process, a negative bus voltage control process, a positive bus current control process and a negative bus current control process. Each module of the application can achieve bidirectional flow of energy, and can specify voltage or power of a port as needed.

Description

Technical field: [0001] The present invention relates to a non-isolated DC converter and a control method thereof, and more particularly to a bidirectional multi-port non-isolated DC converter and a control method thereof. Background technique: [0002] With the continuous development of smart grids, micro-grid technology is a new direction for the development of power grid technology. Its appearance has brought great convenience and opportunities to solve many problems in large power grids. Development provides new ideas. As a branch of microgrid technology, DC microgrid technology has gradually entered people's field of vision with its unique advantages. It has the advantages of high stability, simple control method, convenient power access and easy implementation, and is adopted by many power consumption occasions that require high power supply reliability. [0003] In the DC microgrid technology, the DC converter plays a very important role. The bidirectional DC conver...

Claims

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Application Information

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IPC IPC(8): H02M3/10
Inventor 李官军丁杰胡金杭陶以彬周晨余豪杰杨波赫卫国冯鑫振刘欢曹远志朱红保李跃龙卢俊峰鄢盛驰俞斌桑丙玉王德顺
Owner STATE GRID CORP OF CHINA
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