Power electronic transformer based on energy injection type direct AC-AC converter

Abstract

The invention discloses a power electronic transformer based on an energy injection type direct AC-AC converter. The power electronic transformer comprises a high-frequency transformer, a primary AC-AC converter topology module and a secondary AC-AC converter topology module. The primary AC-AC converter topology module and the secondary AC-AC converter topology module are in a symmetrical topology structure. The primary topology module is connected with the primary side of the high-frequency transformer. The secondary topology module is connected with the secondary side of the high-frequency transformer. According to the power electronic transformer, single-stage conversion and bidirectional transmission of the energy can be realized, the topology structure is simple, the conversion efficiency is high, the size is small, and the cost is low.

Description

technical field [0001] The invention relates to the technical field of transformers, in particular to a power electronic transformer based on an energy injection direct AC-AC converter. Background technique [0002] With the continuous development of society and economy, human beings' demand for energy is increasing day by day. With the continuous depletion of traditional fossil energy, the utilization of renewable energy is becoming more and more important. Although renewable energy has many advantages, most renewable energy has defects such as unstable power supply, discontinuity, and changes with climatic conditions. In order to solve this problem, it is necessary to study a bidirectional power electronic converter, which can control the bidirectional transmission of energy, and combine the energy storage device with the renewable energy generation unit to provide stable and continuous power. At the same time, this bidirectional power electronic converter can replace the...

AI Technical Summary

Problems solved by technology

The disadvantage of the thyristor phase-controlled inverter is that the output voltage frequency generally does not exceed one-third of the input, and the more phases of the input voltage, the more ideal the output waveform, so the efficiency is lower

Although the electrical performance of the matrix converter is excellent, the result is complicated and the control is difficult

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