CN207039464U - A kind of electric power electric transformer based on cascade connection multi-level - Google Patents
A kind of electric power electric transformer based on cascade connection multi-level Download PDFInfo
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- CN207039464U CN207039464U CN201720567964.3U CN201720567964U CN207039464U CN 207039464 U CN207039464 U CN 207039464U CN 201720567964 U CN201720567964 U CN 201720567964U CN 207039464 U CN207039464 U CN 207039464U
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Abstract
The utility model discloses a kind of electric power electric transformer based on cascade connection multi-level, including high voltage variable flow module, high frequency transformer and low pressure current transformer；High frequency transformer is more core structures, and its high-pressure side has multiple windings, and low-pressure side only has a winding, and high-pressure side winding is wound on corresponding magnetic core, and low-pressure side winding will be connected after all magnetic cores and coiling of getting up with the input of low pressure current transformer；All high voltage variable flow modules bear high input voltage after being cascaded by input, the output end of high voltage variable flow module then connects with corresponding high-pressure side winding, and the output end of low pressure current transformer then realizes that low pressure exports.The low-pressure side of the utility model medium/high frequency transformer is only with a winding, without middle leads, can significantly simplify the insulating Design of system, be advantageous to improve the power density of electric power electric transformer, is the practical solution key issue of electric power electric transformer.
Description
Technical field
The utility model belongs to electric and electronic technical field, and in particular to a kind of power electronics based on cascade connection multi-level becomes
Depressor.
Background technology
As substantial amounts of distribution type renewable energy device and energy storage device access power network, power network are wanted to its corollary equipment
Ask and also gradually lifted.Wherein, the auxiliary facility that active control and distribution can be carried out to energy is it in the weight developed in the future
Weight, electric power electric transformer technology have obtained the extensive concern of various circles of society as representative therein.It is as traditional transformer
Substitute, on the basis of the original electrical isolation of traditional transformer, voltage-regulation function, can add new energy access, nothing
Work(compensation, dc power interface, frequency conversion output, the improvement quality of power supply, fault detect and recovery, monitoring and combined network communication etc. in real time
Function.Therefore, the device is expected to as the nucleus equipment in future source of energy internet, but the manufacture skill of electric power electric transformer
Art is not yet ripe at present, and it is low and the problems such as insulation is difficult that converter topology complexity causes high cost, reliability and efficiency.
Electric power electric transformer mainly realizes two functions, first, the control to voltage and current is realized as requested, two
It is the electrical isolation for realizing former secondary.Typical structure is as shown in figure 1, in power network high-pressure side, by high-vol by power network
High pressure industrial-frequency alternating current be converted into high voltagehigh frequency alternating current, then using high frequency transformer decompression be low-voltage high-frequency alternating current,
Low-voltage high-frequency alternating current is converted to by low pressure industrial-frequency alternating current by low pressure current transformer again.Equipment both ends in Fig. 1 can be three
Cross streams or single phase ac or direct current；High frequency transformer portion can have a variety of connected modes, it is such as single around
Group, Multiple coil, more magnetic cores or multiple transformers.
It is pressure-resistant limited due to semiconductor devices, will far from the voltage for meeting electric power electric transformer high pressure side converter
Ask, high pressure side converter needs to realize by way of devices in series or topology cascade.The cascaded topology technology of main flow has
Two kinds, one kind is modular multilevel technology (MMC), and the circuit topology of cascade does not include transformer, and general structure is still such as Fig. 1 institutes
Show, using a high frequency transformer；Another kind is that current transformer is combined to the mode cascaded again, referred to as level with high frequency transformer
Join multilevel converter (CHB).
The structure of cascade connection multi-level circuit is as shown in Figure 2.Compared to MMC, CHB passes through multiple transformer transimission powers, power
Stream can obtain optimal devices use rate without flow through all series topologies.But the shortcomings that this topological, is, excessive
Transformer and Transformer Winding result in extremely difficult insulating Design.
The content of the invention
In view of above-mentioned, the utility model provides a kind of electric power electric transformer based on cascade connection multi-level, and it is by subtracting
The winding quantity of few high frequency transformer low-pressure side, can reduce the requirement to insulating Design.
A kind of electric power electric transformer based on cascade connection multi-level, including multiple high voltage variable flow modules, a high frequency transformation
Device and a low pressure current transformer；The high frequency transformer is more core structures, and its high-pressure side has multiple windings, and low-pressure side only has
One winding, high-pressure side winding be wound on corresponding on magnetic core, low-pressure side winding by after all magnetic cores and coiling of getting up with low pressure
The input connection of current transformer；All high voltage variable flow modules bear high input voltage, high voltage variable flow module after being cascaded by input
Output end then connected with corresponding high-pressure side winding, the output end of low pressure current transformer then realizes that low pressure exports.
If electric power electric transformer high-pressure side is DC supply input, high voltage variable flow module becomes flow module using DC/AC；If
Electric power electric transformer high-pressure side inputs for alternating current, then high voltage variable flow module becomes flow module using AC/AC.
If electric power electric transformer low-pressure side is direct current electricity output, low pressure current transformer uses AC/DC current transformers；If electric power
Electronic transformer low-pressure side is exchange electricity output, then low pressure current transformer uses AC/AC current transformers.
Due to needing to bear very high voltage between the low-pressure side winding and high-pressure side winding of high frequency transformer, this is to low pressure
The design of the insulating Design of side winding leads, especially creep age distance, it is proposed that very high requirement, have in traditional CHB circuits
There are substantial amounts of low-pressure side winding leads, insulating Design is difficult, and is unfavorable for the raising of power density.The utility model medium-high frequency becomes
The low-pressure side of depressor, without middle leads, can significantly simplify the insulating Design of system, be advantageous to improve only with a winding
The power density of electric power electric transformer, it is the practical solution key issue of electric power electric transformer.
Brief description of the drawings
Fig. 1 is the structural representation of conventional electric power electronic transformer.
Fig. 2 is the electric power electric transformer structural representation of high-pressure side cascade.
Fig. 3 is the structural representation of the utility model electric power electric transformer.
Fig. 4 is the structural representation of the utility model high frequency transformer.
Fig. 5 is the structural representation of high voltage variable flow module.
Fig. 6 is the structural representation of low pressure current transformer.
Embodiment
In order to more specifically describe the utility model, below in conjunction with the accompanying drawings and embodiment is to of the present utility model
Technical scheme is described in detail.
As shown in figure 3, electric power electric transformer of the utility model based on cascade connection multi-level, including it is high-vol, low
Volage current transformer and high frequency transformer.
High pressure side converter is formed using several unsteady flow module-cascades, and each module includes two ports, respectively such as Fig. 3
Middle P ends and S ends, wherein P ends, which cascade up, bears high pressure, S termination Transformer Windings.
Transformer uses more core structures, and there are multiple windings its high-pressure side, each to become the corresponding winding of flow module, each
The corresponding magnetic core of winding；Low-pressure side is a winding, by all magnetic cores and coiling of getting up, transformer device structure it is as shown in Figure 4.
High-pressure side therein can be direct current, then high voltage variable flow module is straight-alternation flow module (DC/AC)；High-pressure side
Can be exchange, then each module is friendship-alternation flow module (AC/AC).
Low-pressure side therein can be direct current, then low-pressure side converter module be hand over-directly become flow module (AC/DC), low pressure
Side can also be exchange, then low pressure side converter is friendship-alternation flow module (AC/AC).
Implementation below is so that high-pressure side, low-pressure side are direct current as an example, high-pressure side DC voltage 15kV, low-pressure side
400V。
High-pressure side uses multiple module-cascades, and the voltage for designing each module is 400V, then at least needs 38 module levels
Certain voltage allowance is stayed in connection, design, selects 40 modules.
High voltage variable flow module circuit uses half-bridge structure, using power MOSFET as master control power component, each module
Circuit as shown in figure 5, connection HVDC end PiWith high voltage side of transformer winding Si(wherein i represents i-th of module), function
It is by DC voltage upiBe converted to high-frequency ac voltage usi。
For the winding method of high frequency transformer as shown in Figure 4, it is necessary to using 40 magnetic cores, each magnetic core has a winding connection
High-vol module, coiling low-pressure side winding after all magnetic cores are stacked.
Low pressure current transformer uses full bridge structure, as shown in fig. 6, using power MOSFET, connects low-pressure side winding T and low pressure
DC terminal F, function are to realize the conversion between high-frequency ac and low-voltage direct.
The above-mentioned description to embodiment is understood that for ease of those skilled in the art and using this practicality
It is new.Person skilled in the art obviously can easily make various modifications to above-described embodiment, and illustrating herein
General Principle be applied in other embodiment without by performing creative labour.Therefore, the utility model is not limited to above-mentioned
Embodiment, those skilled in the art according to announcement of the present utility model, all should by the improvement made for the utility model and modification
Should be within the scope of protection of the utility model.
Claims (3)
- A kind of 1. electric power electric transformer based on cascade connection multi-level, it is characterised in that：Including multiple high voltage variable flow modules, one High frequency transformer and a low pressure current transformer；The high frequency transformer is more core structures, and its high-pressure side has multiple windings, low Pressure side only has a winding, high-pressure side winding be wound on corresponding on magnetic core, low-pressure side winding is by all magnetic cores and coiling of getting up The input with low pressure current transformer is connected afterwards；All high voltage variable flow modules bear high input voltage, high pressure after being cascaded by input The output end for becoming flow module then connects with corresponding high-pressure side winding, and the output end of low pressure current transformer then realizes that low pressure exports.
- 2. electric power electric transformer according to claim 1, it is characterised in that：If electric power electric transformer high-pressure side is straight Stream electricity input, then high voltage variable flow module is using DC/AC change flow modules；If electric power electric transformer high-pressure side inputs for alternating current, Then high voltage variable flow module becomes flow module using AC/AC.
- 3. electric power electric transformer according to claim 1, it is characterised in that：If electric power electric transformer low-pressure side is straight Electricity output is flowed, then low pressure current transformer uses AC/DC current transformers；If electric power electric transformer low-pressure side is exchange electricity output, low Volage current transformer uses AC/AC current transformers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720567964.3U CN207039464U (en) | 2017-05-19 | 2017-05-19 | A kind of electric power electric transformer based on cascade connection multi-level |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720567964.3U CN207039464U (en) | 2017-05-19 | 2017-05-19 | A kind of electric power electric transformer based on cascade connection multi-level |
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| CN207039464U true CN207039464U (en) | 2018-02-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107070247A (en) * | 2017-05-19 | 2017-08-18 | 浙江大学 | A kind of electric power electric transformer based on cascade connection multi-level |
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2017
- 2017-05-19 CN CN201720567964.3U patent/CN207039464U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107070247A (en) * | 2017-05-19 | 2017-08-18 | 浙江大学 | A kind of electric power electric transformer based on cascade connection multi-level |
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