Single-phase power electronic transformer topology structure and control method thereof
A technology of power electronics and topology, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., can solve problems such as increasing the volume of the system, and achieve the effect of two-way power flow
Active Publication Date: 2019-06-21
CENT SOUTH UNIV
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Problems solved by technology
In order to ensure that the rectified output voltage remains basically constant, an electrolytic capacitor with a larger capacitance is usually connected in parallel on the output side of the rectifier stage, which will increase the volume of the entire system
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[0021] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
[0022] Such as figure 1 As shown, the topological mechanism of the single-phase power electronic transformer provided by the present invention is sequentially connected to an input stage circuit, an isolation stage circuit and an output stage circuit, and the input stage circuit is composed of a first H-bridge circuit.
[0023] Preferably, the first H-bridge circuit is composed of two pairs of series switch tubes connected in parallel, including: a first IGBT power device S 1 , the second IGBT power device S 2 , the third IGBT power device S 3 and the fourth IGBT power device S 4 , the specific connection method is:
[0024] The first IGBT power device S 1 collector ...
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The invention provides a single-phase power electronic transformer topology structure and a control method thereof. The topology structure comprises an input-stage circuit, an isolation-stage circuitand an output-stage circuit which are sequentially connected, wherein the input-stage circuit comprises an H-bridge circuit working in a power frequency switching state, the isolation-stage circuit comprises a bidirectional DC-DC converter, power is transmitted by LC series resonance, meanwhile, zero-current shutoff of a switch is achieved, the switch loss is reduced, the output-stage circuit is of an H-bridge circuit structure, and the adjustment of voltage amplitude of an output end is achieved by switch inversion. In the single-phase power electronic transformer topology structure, no intermediate energy storage link is involved, a DC bus capacitor employs small-capacitance thin film capacitor, the volume of the whole system can be reduced, the reliability of the system is improved, andbidirectional flowing of the power can be achieved.
Description
technical field [0001] The present invention relates to the technical field of power electronics, and more specifically, to a single-phase power electronic transformer topology and a control method thereof. Background technique [0002] Traditional power frequency transformers are not only large in size, but also relatively single in function. With the rapid development of smart grids and the grid connection of various distributed energy sources, the functions of traditional power frequency transformers can no longer meet the requirements of modern power systems. Power electronic transformers, also known as solid-state transformers, smart transformers or flexible transformers, are a new type of transformers that realize power system voltage conversion and energy transfer through power electronics technology. Power electronic transformers are not only small in size and light in weight, but also have the advantages of highly controllable primary and secondary side voltages, c...
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IPC IPC(8): H02M5/458H02M3/335
Inventor 王辉谭凯元粟梅孙尧
Owner CENT SOUTH UNIV