A control method for a bidirectional multi-port non-isolated DC converter

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 invention relates to a non-isolated DC converter and a control method thereof, and more particularly to a control method of a bidirectional multi-port non-isolated DC converter. Background technique: [0002] With the continuous development of smart grid, 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 of large power grids, and it has also brought great convenience and opportunities for the utilization and utilization of various distributed power sources. 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 supply access and easy implementation, etc., and is adopted by many power consumption occasions that require high power supply...

AI Technical Summary

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 the DC converter There are several problems in the application of micro-grid: 1. The insulation problem of the high-voltage DC system to the ground; 2. The compatibility of DC sources with different voltage levels connected to the converter; 3. The redundancy design of the capacity DC conversion system

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