Modularized H-bridge cascade multilevel mutual-balance power electronic transformer

Abstract

The invention provides a modularized H-bridge cascade multilevel mutual-balance power electronic transformer. Power electronic devices are formed on the basis of IGBTs, the power electronic transformer can achieve four-quadrant controlled operation through an effective control strategy, two-way power flow control can be performed, a H-bridge cascade multilevel modularized structure is adopted for a main circuit, large-scale modularized production is facilitated, actual high-voltage class application can be performed, the harmonic content of output voltage is lower, the switching frequency of the power electronic devices is low, loss is lower, and the voltage-sharing problem is avoided. The system structure of the modularized H-bridge cascade multilevel mutual-balance power electronic transformer is in an AC/DC/AC mode, the high-voltage stage, the isolation stage and the low-voltage stage are achieved, and while the voltage transformation function, the isolation function, the energy transmission function and the like of a conventional transformer are completed, the power flow control and the function of control over the quality of electric energy can be completed.

Description

technical field [0001] The invention relates to a transformer, in particular to a modularized H-bridge cascaded multi-level mutual balanced power electronic transformer. Background technique [0002] Power electronic transformer is also called solid-state transformer or flexible transformer. It is a new type of transformer based on power electronic conversion technology and electromagnetic induction technology. It completely changes the system structure of traditional transformers. On the basis of basic functions such as electrical isolation and energy transfer, it can also realize many additional functions such as bidirectional power flow control and power quality control. It is the key equipment for the construction of the next generation of smart grid. The flexible control of the power electronic transformer can be realized by using the fully-controlled composite power electronic device Insulated Gate Bipolar Transistor (IGBT), so that it can operate in four quadrants. H...

AI Technical Summary

Problems solved by technology

Some current power electronic transformer technologies do not have the ability to automatically balance three-phase electric energy, and need to be controlled separately to solve the problem.

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