Flying capacitor three-level unipolar current module

Abstract

The present invention proposes a flying capacitor three-level unipolar current module, which consists of a first parallel branch, a second parallel branch and a second capacitor C 2 Composition, the first parallel branch includes the first full-control switching device T 1 , the second full control switching device T 2 , the first diode D 1 , the second diode D 2 and the first capacitor C 1 , the second parallel branch includes a fully controlled switching device unit T 3 , diode unit D 3 ,T 1 emitter with T 2 connected to the collector, T 1 collector with D 2 connected to the anode, D 1 anode with D 2 connected to the cathode, C 1 anode with D 1 anode and D 2 connected to the cathode, C 1 The cathode of T1 is connected to the emitter of T1 and the collector of T2, T 3 emitter with D 3 The cathode connection of the first parallel branch, the anode of the second parallel branch and C 2 The anodes of the first parallel branch are connected to each other, the cathode of the first parallel branch, the cathode of the second parallel branch and C 2 The cathodes are connected to each other. The invention has the advantages of low cost and compact structure.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a flying capacitor three-level unipolar current module. Background technique [0002] A power module is the basic unit of a high-power multilevel converter, including cascaded multilevel converters, modular multilevel converters and other converters, which include a large number of power module units. Multilevel converters represented by cascaded multilevel converters and modular multilevel converters have good current harmonic characteristics, decoupling control of active and reactive power, modular design, and easy implementation of faults. Fault-tolerant operation and other advantages have been widely used in high-voltage and high-power power conversion occasions, such as flexible DC transmission, large-capacity dynamic reactive power compensation, power quality control, and motor variable frequency drive. [0003] Taking a modular multilevel converter as an example...

AI Technical Summary

Problems solved by technology

However, the two controllable switching devices in the diagonal bridge module are distributed in the diagonal positions of the module, so the controllable switching devices can only use a single device module, and cannot use a more integrated Dual-pipe module is not conducive to the integrated design of the module

Moreover, every time a diagonal bridge module is added, the total level of the converter will only increase by two. In the high-voltage application field, a large number of diagonal bridge modules are required, and the overall use space of auxiliary equipment and equipment is relatively large, and the structure is not compact enough.

Images