Three-phase separating type hybrid power electronic transformer and control method thereof

Abstract

The invention discloses a three-phase separating type hybrid power electronic transformer and a control method thereof. The three-phase separating type hybrid power electronic transformer comprises amulti-winding transformer, an H-bridge back-to-back transformer and a static switch. According to the three-phase separating type hybrid power electronic transformer disclosed by the invention, quality regulation and control of electric energy can be realized, the capacity of a power electronic transformer can be effectively amplified, and high-power electric energy transmission can be realized; by adopting the three-phase separating type H-bridge back-to-back transformer, per-phase circuits adopt one single-phase full-bridge circuit, the per-phase circuits can be completely independent, reactive power independent compensation and independent control of each per-phase circuit and reactive current compensation and dynamic voltage recovery on split phases can be realized, and stability of output voltage can be ensured; meanwhile, effective switching of serial transformers can be realized through reasonable control on the static switch, the output voltage is enabled not to be influenced under normal operation, and the influence of harmonic waves generated by a compensation circuit to the electric energy quality can be effectively reduced.

Description

technical field [0001] The invention relates to the application field of power electronic devices in power systems, in particular to a three-phase separated hybrid power electronic transformer and a control method thereof. Background technique [0002] With the development and wide application of power electronic technology, power electronic transformers are attracting more and more attention. While the power electronic transformer has the advantages of small footprint, compact structure, and strong regulation ability, it also has the disadvantages of small capacity, low input and output voltage levels, and its power transmission capacity is much lower than that of traditional transformers. [0003] At present, the main function of the traditional transformer is to realize the transformation of the AC voltage level, realize the power transmission and distribution function of the power grid, and does not have the ability to adjust the power quality of the power grid, and the ...

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Problems solved by technology

[0005] A three-phase separated hybrid power electronic transformer and its control method are provided to solve the problems that the traditional transformer does not have the ability to adjust the power quality of the power grid and the current power electronic transformer has a small capacity. The reactive power of each phase circuit cannot be dynamically independently compensated and independently controlled, and the current voltage compensation circuit brings more harmonics to the power grid, which has a greater impact on power quality.

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