A fully isolated multi-port converter

A converter and multi-port technology, applied in the field of power systems and power electronics, can solve the problems of practical application limitations, no electrical isolation, high technical difficulty of multi-winding high-frequency isolation transformers, and achieve flexible space layout, independent control system and The effect of being flexible and convenient for engineering implementation

Inactive Publication Date: 2020-04-07
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no electrical isolation between the medium and high voltage AC ports and the medium and high voltage DC ports; likewise, there is no electrical isolation between the low voltage AC ports and the low voltage DC ports
[0004] So far, most multi-port converters have been combined in such a way that the electrical isolation between the ports cannot be achieved
Multi-winding high-frequency isolation transformers are used to achieve electrical isolation between multiple ports. The combination method is as follows: figure 2 As shown, however, the technical difficulty of the multi-winding high-frequency isolation transformer is relatively high, and the practical application is greatly limited

Method used

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  • A fully isolated multi-port converter
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Examples

Experimental program
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Embodiment 1

[0048] attached image 3 It is the combination mode 1 of the multi-port converter based on a single group of medium and high frequency AC buses in Embodiment 1, such as image 3 As shown, the converter is a multi-port converter, and a medium-high frequency AC bus bar is constructed by using a single-phase double-winding medium-high frequency isolation transformer to realize electrical isolation between ports. Each port contains a plurality of modules, wherein, port 1 is a medium-high voltage AC port, including a medium-high voltage three-phase converter, and modules H1-1, modules H1-2, ..., modules H1-n, the modules H1-1, module H1-2, ..., the DC side of module H1-n are respectively connected to medium and high voltage three-phase converters, and correspondingly, the AC side of each module is respectively isolated from medium and high frequency isolation transformer T1-1 and medium and high frequency Transformer T1-2...The primary side of the medium and high frequency isolati...

Embodiment 2

[0050] In practical applications, it is often only required to achieve electrical isolation between ports, but not between modules. In order to reduce costs, the medium and high frequency isolation transformer of a certain port can be omitted. In this embodiment, the medium and high frequency isolation transformer of port 2 is omitted, and its combination method is as follows Figure 4 As shown, each port contains multiple modules, among which, port 1 is a medium and high voltage AC port, including a medium and high voltage three-phase converter, and modules H1-1, modules H1-2, ..., modules H1-n, The DC sides of the modules H1-1, H1-2, ..., the modules H1-n are respectively connected to medium and high voltage three-phase converters, and correspondingly, the AC sides of each module are respectively connected to medium and high frequency isolation transformers T1-1, Medium and high frequency isolation transformers T1-2, ..., the primary sides of medium and high frequency isolat...

Embodiment 3

[0052] In addition to the combination of a single set of medium and high frequency AC buses, the multi-port converter can also use the combination of multiple sets of medium and high frequency AC buses. This embodiment adopts the combination of 3 sets of medium and high frequency AC buses. The structure Such as Figure 5 as shown,

[0053] Port 1 is a medium and high voltage AC port, including 3 single-phase converters, n modules and n medium and high frequency isolation transformers. Among them, the A-phase converter is connected with the module H1-A respectively 1 , Module H1-A 2 ,..., module H1-A n The DC side is connected, correspondingly, the module H1-A 1 , Module H1-A 2 ,..., module H1-A n The AC side is respectively connected with the medium and high frequency isolation transformer T1-A 1 , Medium and high frequency isolation transformer T1-A 2 ,..., medium and high frequency isolation transformer T1-A n The primary sides of the above-mentioned medium and high...

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Abstract

The invention discloses a fully isolated multi-port converter belonging to the technical field of power systems and power electronics. The converter adopts medium and high frequency isolation transformers to realize electrical isolation and construct single or multiple sets of medium and high frequency AC buses. In the combination mode of the single group of medium and high frequency AC buses, the secondary sides of all medium and high frequency isolation transformers are connected in parallel to form a single group of medium and high frequency AC buses; in the combination mode of multiple groups of medium and high frequency AC buses, the secondary sides of the medium and high frequency isolation transformers are respectively connected to To different groups of medium and high frequency AC buses. In the present invention, the multi-port converter combination realized by means of the medium-high frequency isolation transformer and the medium-high frequency AC busbar enables each module and port to be electrically isolated from each other, the spatial arrangement of each module and each port is flexible, and the control of each port is more independent and efficient. Flexible and easy for engineering implementation.

Description

technical field [0001] The invention belongs to the technical field of power systems and power electronics, and in particular relates to a fully isolated multi-port converter. Background technique [0002] Multi-port converters are usually used in flexible power transmission and distribution systems such as multi-terminal flexible DC transmission, power routers, flexible ring network controllers, aircraft and ship power distribution networks, and can realize flexible transformation and routing of electric energy. [0003] A typical combination of multi-port converters is as follows figure 1 As shown, multiple ports of medium-high voltage AC, medium-high voltage DC, low-voltage AC and low-voltage DC can be realized by using this combination method. However, there is no electrical isolation between the medium-high voltage AC port and the medium-high voltage DC port; likewise, there is no electrical isolation between the low-voltage AC port and the low-voltage DC port. [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/00
CPCH02M1/00H02M1/0067H02M1/0083
Inventor 张春朋李凯赵争鸣魏鹏环莫昕袁立强沈瑜
Owner TSINGHUA UNIV
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