Flying capacitor three-level monopole current module

Abstract

The invention provides a flying capacitor three-level monopole current module. The flying capacitor three-level monopole current module consists of a first parallel branch, a second parallel branch and a second capacitor C2, wherein the first parallel branch comprises a first fully-controlled switch device T1, a second fully-controlled switch device T2, a first diode D1, a second diode D2 and a first capacitor C1; the second parallel branch comprises a fully-controlled switch device unit T3 and a diode unit D3; the emitter of the T1 is connected with the collector of the T2; the collector of the T1 is connected with the positive electrode of the D2; the positive electrode of the D1 is connected with the negative electrode of the D2; the positive electrode of the C1 and the positive electrode of the D1 are connected with the negative electrode of the D2; the negative electrode of the C1 is connected with the emitter of the T1 and the collector of the T2; the emitter of the T3 is connected with the negative electrode of the D3; the positive electrode of the first parallel branch and the positive electrode of the second parallel branch are connected with the positive electrode of the C2 mutually; and the negative electrode of the first parallel branch and the negative electrode of the second parallel branch are connected with the negative electrode of the C2 mutually. The flying capacitor three-level monopole current module 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.

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