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An Improved Power Electronic Transformer Topology for High Power Density and High Efficiency

A high power density, power electronic technology, applied in the field of substation, can solve the problems of increasing the size of the device, cost and control complexity, unfavorable for the popularization and application of power electronic transformers, unable to realize soft switching technology, etc. The effect of improving efficiency and reducing switching loss

Active Publication Date: 2021-02-02
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, due to the large number of conversion stages of the power electronic transformer, the number of sub-modules is large, which greatly increases the volume, cost and control complexity of the device; and because the modular structure of the high-voltage AC side cannot realize the soft switching technology, reducing It affects the operation efficiency of the device, which is not conducive to the popularization and application of power electronic transformers

Method used

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  • An Improved Power Electronic Transformer Topology for High Power Density and High Efficiency
  • An Improved Power Electronic Transformer Topology for High Power Density and High Efficiency
  • An Improved Power Electronic Transformer Topology for High Power Density and High Efficiency

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Embodiment 1

[0044] as figure 1 Based on the new topological structure of a power electronic transformer with high power density and high efficiency, it has three phases A, B, and C. image 3 As shown in the three-level NPC structure, its L 1 Common inductance is not 0, L 0 filter inductor with L 1 The common inductors together form a filter inductor, which improves the quality of the grid current waveform and blocks the path of high-frequency harmonics injected into the grid. L 1 Common inductance, L 2 Resonant inductance vs. C 1 The resonant capacitor forms a high-frequency resonant circuit, which provides a path for the transmission of high-frequency harmonics between the high-voltage side converter and the primary side of the high-frequency transformer, and blocks the transmission path between the low-frequency voltage current and the primary side of the high-frequency transformer. In its high-frequency isolation transformer part, such as Figure 4 In the star / delta connection m...

Embodiment example 2

[0046] as figure 1 Based on the new topological structure of a power electronic transformer with high power density and high efficiency, it has three phases A, B, and C. Figure 4 As shown in the five-level NPC structure, its L 1 The common inductance is 0, at this time L 0 As a low frequency filter inductor alone, L 2 It can be used alone as the primary resonant inductance of the high-frequency isolation transformer. In its high-frequency isolation transformer part, such as Figure 4 In the star / delta connection mode shown, the low-voltage side structure adopts the following Figure 9 The low-voltage side topology with only DC ports is shown, and the resulting topology is as follows Figure 14 shown. Under the same withstand voltage level of power devices, this topology can improve the voltage access level of its high-voltage side.

[0047] The high-voltage side converter topology of the present invention includes three structures of a two-level converter, a three-level ...

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Abstract

The invention discloses an improved topological structure of a power electronic transformer with high power density and high efficiency, which belongs to the technical field of power transformation. The topology of the power electronic transformer includes a high-voltage converter stage, a high-frequency isolation transformer, a low-voltage side rectifier, and a low-voltage side output structure; it uses PWM fundamental wave and harmonic voltage and current for energy transmission, and realizes high-voltage rectification and high-frequency isolation. The power electronic transformer topology of all switching devices ZVS, the high-voltage side of the topology is a voltage source converter, which can adopt a two-level, three-level or five-level converter structure, providing high-voltage AC and DC ports and low-voltage AC and DC ports. By realizing the zero-voltage switching of the input stage and the isolation stage, the operating efficiency of the power electronic transformer can be improved; the number of transformation stages can be reduced, and the power density can be improved. Its ZVS characteristic can reduce the switching loss of the power device and improve the efficiency.

Description

technical field [0001] The invention belongs to the technical field of power transformation, and in particular relates to an improved topological structure of a power electronic transformer with high power density and high efficiency. Background technique [0002] With the rapid development of smart grids, traditional industrial frequency power transformers are no longer sufficient to meet the challenges of modern power systems due to their large size, inability to realize intelligent control, and lack of DC conversion ports. The power electronic transformer is a new type of power electronic device with functions such as voltage conversion, reactive power compensation, unbalance control, and power quality management. It is convenient for the access and consumption of renewable energy, and it also helps to improve the operating efficiency and reliability. Multi-port power electronic transformers have the function of power routers in the Energy Internet. [0003] At present,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483H02M7/487H02M1/12
CPCH02M1/126H02M7/483H02M7/487H02M7/4835Y02B70/10
Inventor 张雪垠徐永海徐少博牟杰龙云波
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)