Multifunctional hybrid power electronic transformer and control method based on mmc matrix converter
A technology of matrix converter and power transformer, which is applied in the direction of converting AC power input to AC power output, AC network voltage adjustment, electrical components, etc., and can solve the problem of complicated capacitor voltage balance control, limited application range, and unfavorable power density of power electronic transformers. and other problems, to achieve the effect of overcoming the failure of normal operation, reducing the amount of calculation, and compact structure
Active Publication Date: 2021-02-26
SOUTHEAST UNIV
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Problems solved by technology
For the existing technical solutions using AC-DC-AC converters, since they are used in medium-high voltage and high-power applications, the input side mostly adopts H-bridge cascade structure or modular multi-level converters, and the capacitor voltage balance control very complicated
At the same time, the isolation link requires multiple DC-DC converters and medium and high frequency transformers, which is not conducive to the power density of power electronic transformers
On the other hand, the existing technical solutions using AC-AC converters are limited by the withstand voltage value of the power switching devices in the converters, making them unsuitable for high-voltage and large-capacity occasions, which limits their application range
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[0021]The technical solution of the present invention will be further described below in conjunction with the drawings and embodiments.
[0022]Such asfigure 1 Shown is the topological structure diagram of a multifunctional hybrid power electronic transformer based on MMC matrix converter, which mainly includes power transformer and MMC matrix converter. The primary winding of the power electronic transformer is connected to the power grid, and the secondary winding is connected in a star shape to the input of the MMC matrix converter. The output of the MMC matrix converter is connected to the isolation transformer after passing through the LC filter. One end of the isolation transformer is connected to the secondary winding. Connect the load at the other end.
[0023]figure 2 Shown is the topological structure diagram of the MMC matrix converter in the power electronic transformer. The MMC matrix converter is a single-phase modular multi-level matrix converter. Its structure contains fou...
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The invention discloses a multifunctional hybrid power electronic transformer and a control method based on an MMC matrix converter. The power electronic transformer includes a power transformer and an MMC matrix converter. The primary winding of the power electronic transformer is connected to the power grid, and the secondary winding adopts a star Type connection, connected to the input terminal of the MMC matrix converter, the output terminal of the MMC matrix converter is connected to the isolation transformer after passing through the LC filter, one end of the isolation transformer is connected to the secondary winding, and the other end is connected to the load. The invention improves the electric energy conversion efficiency of the power electronic transformer, and improves the compactness of the device; the MMC matrix converter in the transformer topology is based on a modular multi-level structure, so that the device can be applied to high-voltage and high-power occasions; when the power grid fails It can perform voltage compensation and improve the power quality of the power grid; at the same time, each bridge arm branch of the matrix converter structure is relatively independent, which improves the flexibility of the control strategy.
Description
Technical field[0001]The invention belongs to the technical field of power electronics, and in particular relates to a multifunctional hybrid power electronic transformer based on an MMC matrix converter and a control method.Background technique[0002]As the basic equipment of the power system, the traditional power transformer has the characteristics of simple structure and high reliability. However, with the continuous development of power grid systems, the defects of traditional power transformer equipment, such as large size, easy generation of harmonic problems, and inability to guarantee power quality, have become increasingly prominent. In recent years, due to the rapid development of power electronic technology, especially power electronic device technology, power electronic transformer (Power Electronic Transformer, PET) as a new type of power transformer has received more and more attention and attention from domestic and foreign scholars. Power electronic transformers not ...
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IPC IPC(8): H02M5/293H02J3/12
Inventor 王建华赵剑锋宋杰季振东杨斌许胜
Owner SOUTHEAST UNIV