Dual-capacitor module based MMC type multi-port power electronic transformer

Abstract

The invention discloses a dual-capacitor module based MMC type multi-port power electronic transformer. The transformer comprises a modular multilevel converter (MMC), a DC/DC converter and an inverter, wherein the MMC has two sub modules; the DC/DC converter comprises a primary part, a high frequency voltage transformation part and a secondary part, wherein the primary part has four kinds of selective topologies. The transformer can be operated on the high voltage direct current side at a low voltage; the transformer has fault ride-through capability, and relatively less devices are used; the module in the MMC and the DC/DC converter are responsible for direct current voltage control and power control respectively; a single capacitor voltage of the module can be controlled independently, or two capacitor voltages of the module can be controlled simultaneously; the transformer is equipped with the four ports, including a high voltage direct current port, a high voltage alternating current port, a low voltage direct current port and a low voltage alternating current port, so that the transformer is suitable for multi-kind high-voltage high-power occasions of multiple voltage levels, and particularly suitable for the energy internet; for example, the transformer can be used as an energy router, and the like.

Description

technical field [0001] The invention belongs to the technical field of power electronics applications, and in particular relates to an MMC type multi-port power electronic transformer based on a double capacitor module. Background technique [0002] The electronic power transformer is a new type of intelligent transformer that combines power electronic conversion technology and power conversion technology based on the principle of electromagnetic induction to transform the power of one power characteristic into the power of another power characteristic. It can complete functions such as conventional transformer voltage transformation, isolation, and energy transfer, as well as waveform control, power flow control, or power quality regulation. Therefore, it has the potential to solve many new problems faced by power systems. However, the power electronic transformer with the existing structure also has some disadvantages, especially the application under the occasion of multi...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: the existing electronic power transformer has complex structure, high cost, high harmonic content, poor use effect, and cannot meet the application requirements in multi-power supply occasions

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