CN103427658A - High-voltage DC-DC conversion device based on multi-winding transformer - Google Patents
High-voltage DC-DC conversion device based on multi-winding transformer Download PDFInfo
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Abstract
The invention discloses a high-voltage DC-DC converter based on a multi-winding transformer. The high-voltage DC-DC conversion device comprises an input cascade converter unit, a multi-winding medium- and low-frequency sinusoidal transformer and an input parallel converter unit. The high-voltage DC-DC converter comprises at least one first converter submodule the same in structure. The input ends of the first converter submodules are connected between the high-voltage anode and the high-voltage cathode after being positively and serially connected in sequence. The multi-winding medium- and low-frequency sinusoidal transformer comprises at least one input winding and at least one output winding. The input windings are as many as the first converter submodules and are in one-to-one correspondence to the first converter submodules. The input parallel converter unit comprises at least one second converter submodules the same in structure. The input ends of the second converter submodules are all connected to the output windings of the multi-winding medium- and low-frequency sinusoidal transformer. Through the use of the high-voltage DC-DC conversion device, the voltage standing problem and the voltage sharing problem in high-voltage switching devices of the existing high-voltage DC-DC conversion equipment are solved, and the problem that the existing DC-DC conversion equipment is insufficient in transmission capacity is also solved.
Description
Technical field
The present invention relates to the device of a kind of high voltage direct current-direct current energy conversion, transmission, particularly a kind of high voltage direct current-DC converter based on multi winding transformer.
Background technology
High voltage direct current transmission (HVDC) has the characteristics such as the transmission power capacity is large, loss is little, fed distance is far away, good stability, has broad application prospects.In the future high voltage direct current transmission to be directly applied to power consumption equipment in order adapting to, need to have and exchange the functionally similar direct current transformation device of isolating transformer, high voltage direct current is converted to the low-voltage DC that power consumption equipment requires that meets of isolation.
Because the withstand voltage of single power semiconductor is normally limited, so single power semiconductor can't directly apply to the high voltage occasion.In order to realize that low voltage power devices can be applied in the high voltage occasion, usually adopt following several method: 1) multilevel converter; 2) a plurality of power semiconductor serial connection technologies; 3) a plurality of power model serial connection technologies.
Document " Dragan Jovcic. ' Bidirectional; High-Power DC Transformer ' .IEEE Transactions on Power Delivery; Vol.24; No.4; pp:2276-2283, October2009 " adopts Thyristors in series technology, harmonic technology to realize powerful DC converting and transmission.But high-pressure side and low-pressure side do not have electrical isolation, high-pressure side and low-pressure side thyristor valve group are all born high side voltage, have increased equipment cost.In addition, the LC resonant circuit produces larger reactive capability in the course of the work, has increased place capacity and line loss, has reduced conversion efficiency.
Chinese patent application 201010117551.8 has related to a kind of high voltage direct current-direct current power electronic transformer, and this commutator transformer consists of tandem type Modularized current transformer, double winding intermediate frequency or high frequency transformer and a full-control type H bridge.Produce intermediate frequency or the high frequency square wave voltage of many level by the tandem type Modularized current transformer, double winding intermediate frequency or high frequency transformer are realized voltage transformation and the power transmission of DC-to-DC, and full-control type H bridge converts the secondary square-wave voltage of intermediate frequency or high frequency transformer to direct voltage.
Chinese patent application 200810024744.1 has related to a kind of based on full-bridge topologies input series and output parallel automatically equalizing voltage commutator transformer, adopts the topological structure of the commutator transformer power model input series and output parallel of a plurality of full-bridge topologies.Utilize input series and output parallel structure and the effect of transformer side edge clamp, automatically realize that each module input side all presses.
In Chinese patent application 201010117551.8 and 200810024744.1, all adopted intermediate frequency or high frequency square wave transformer to carry out electrical isolation, voltage transformation and power transmission.But available intermediate frequency or high frequency square wave transformer efficiency capacity is difficult to reach more than up to a hundred kilowatts at present, limited to a certain extent the application of this type of commutator transformer.
Comprehensively above-mentioned, current high voltage direct current-DC converter exists the withstand voltage and voltage-sharing of high side switch device, and the transmission capacity deficiency, haves much room for improvement.
Summary of the invention
Purpose of the present invention, be to provide a kind of high voltage direct current-DC converter based on multi winding transformer, it can solve withstand voltage, the voltage-sharing of high side switch device of current high voltage direct current-DC converter and the problem of existing DC-dc conversion device transmission capacity deficiency, significant to the practical and commercialization of accelerating high voltage direct current-DC converter.
In order to reach above-mentioned purpose, solution of the present invention is:
A kind of high voltage direct current-DC converter based on multi winding transformer, comprise input series connection converter cell, the sinusoidal wave transformer of many windings medium and low frequency and input parallel converters unit;
Described input series connection converter cell comprises the first current transformer submodule that at least one structure is identical, and when comprising first a current transformer submodule, the input of this first current transformer submodule is connected between on high-tension side positive pole and negative pole; When comprising that 2 or 2 when above, are connected between on high-tension side positive pole and negative pole after the series connection of the input of all the first current transformer submodules order forward;
The sinusoidal wave transformer of described many windings medium and low frequency comprises at least one input winding and an output winding, the quantity of described input winding is identical with the quantity of the first current transformer submodule, and the output of input winding and the first current transformer submodule connects one to one;
Described input parallel converters unit comprises the second current transformer submodule that at least one structure is identical, and the input of all the second current transformer submodules all connects the output winding of the sinusoidal wave transformer of many windings medium and low frequency; If while comprising more than 2 or 2 the second current transformer submodule, the connected mode that the output of all the second current transformer submodules adopts series, parallel or connection in series-parallel to mix.
The sinusoidal wave single-phase transformer of the sinusoidal wave many windings of transformer adopting of above-mentioned many windings medium and low frequency medium and low frequency or the sinusoidal wave three-phase transformer of many windings medium and low frequency.
The output winding of the sinusoidal wave transformer of above-mentioned many windings medium and low frequency adopts a coil, or at least two coils parallel with one another.
Above-mentioned first and second current transformer submodule comprises passive filter module and the power conversion module of order series connection, wherein, the power conversion module adopts two Level Full Bridge topologys, many level half-bridges topology or many Level Full Bridges topology, and passive filter module adopts LC filter circuit or LCL filter circuit.
The sinusoidal wave single-phase transformer of the sinusoidal wave many windings of transformer adopting of above-mentioned many windings medium and low frequency medium and low frequency, the topological structure of first and second current transformer submodule adopts two level single-phase semi-bridge LC filtering topologys, two level single-phase semi-bridge LCL filtering topologys, two level single-phase full bridge LC filtering topologys, two level single-phase full bridge LCL filtering topologys, tri-level single phase neutral point clamp half-bridge LC filtering topology, tri-level single phase neutral point clamp half-bridge LCL filtering topology, tri-level single phase striding capacitance half-bridge LC filtering topology or tri-level single phase striding capacitance half-bridge LCL filtering topology.
The sinusoidal wave three-phase transformer of the sinusoidal wave many windings of transformer adopting of above-mentioned many windings medium and low frequency medium and low frequency, the topological structure of first and second current transformer submodule adopts two level three phase full bridge LC filtering topologys, two level three phase full bridge LCL filtering topologys, three level three-phase neutral point clamp full-bridge LC filtering topology or three level three-phase neutral point clamp full-bridge LCL filtering topologys.
In above-mentioned first and second current transformer submodule, the capacitor group in passive filter module adopts the Y type to connect or the △ type connects.
The structure of above-mentioned first and second current transformer submodule is identical or different.
After adopting such scheme, the present invention can fine solution high voltage direct current-DC converter withstand voltage, the voltage-sharing of high side switch device and the problem of existing DC-dc conversion device transmission capacity deficiency, significant to the practical and commercialization of accelerating high voltage direct current-DC converter; Adopt the module serial connection technology can expand flexibly the electric pressure of transformer; The power capacity of the sinusoidal wave transformer of many windings medium and low frequency adopt the sinusoidal wave transformer device structure of many windings medium and low frequency can realize electrical isolation, voltage transformation and the power transmission of high-pressure side and low-pressure side, more than can reach the MW level simultaneously.
The accompanying drawing explanation
Fig. 1 is overall structure figure of the present invention;
Fig. 2 is that in the present invention, the current transformer submodule adopts two level single-phase semi-bridge LC filtering topology diagrams;
Fig. 3 is that in the present invention, the current transformer submodule adopts two level single-phase semi-bridge LCL filtering topology diagrams;
Fig. 4 is that in the present invention, the current transformer submodule adopts two level single-phase full bridge LC filtering topology diagrams;
Fig. 5 is that in the present invention, the current transformer submodule adopts two level single-phase full bridge LCL filtering topology diagrams;
Fig. 6 is that in the present invention, the current transformer submodule adopts tri-level single phase neutral point clamp half-bridge LC filtering topology diagram;
Fig. 7 is that in the present invention, the current transformer submodule adopts tri-level single phase neutral point clamp half-bridge LCL filtering topology diagram;
Fig. 8 is that in the present invention, the current transformer submodule adopts tri-level single phase striding capacitance half-bridge LC filtering topology diagram;
Fig. 9 is that in the present invention, the current transformer submodule adopts tri-level single phase striding capacitance half-bridge LCL filtering topology diagram;
Figure 10 is that in the present invention, the current transformer submodule adopts two level three phase full bridge LC filtering topology diagrams;
Wherein, the capacitor group C in passive filter module
0Adopt the Y type to connect;
Figure 11 is that in the present invention, the current transformer submodule adopts two level three phase full bridge LCL filtering topology diagrams;
Wherein, the capacitor group C in passive filter module
0Adopt the Y type to connect;
Figure 12 is that in the present invention, the current transformer submodule adopts two level three phase full bridge LC filtering topology diagrams;
Wherein, the capacitor group C in passive filter module
0Adopt the △ type to connect;
Figure 13 is that in the present invention, the current transformer submodule adopts two level three phase full bridge LCL filtering topology diagrams;
Wherein, the capacitor group C in passive filter module
0Adopt the △ type to connect;
Figure 14 is that in the present invention, the current transformer submodule adopts three level three-phase neutral point clamp full-bridge LC filtering topology diagrams;
Wherein, the capacitor group C in passive filter module
0Adopt the Y type to connect;
Figure 15 is that in the present invention, the current transformer submodule adopts three level three-phase neutral point clamp full-bridge LCL filtering topology diagrams;
Wherein, the capacitor group C in passive filter module
0Adopt the Y type to connect;
Figure 16 is that in the present invention, the current transformer submodule adopts three level three-phase neutral point clamp full-bridge LC filtering topology diagrams;
Wherein, the capacitor group C in passive filter module
0Adopt the △ type to connect;
Figure 17 is that in the present invention, the current transformer submodule adopts three level three-phase neutral point clamp full-bridge LCL filtering topology diagrams;
Wherein, the capacitor group C in passive filter module
0Adopt the △ type to connect.
Embodiment
Below with reference to drawings and the specific embodiments, technical scheme of the present invention is elaborated.
As shown in Figure 1, the invention provides a kind of high voltage direct current-DC converter based on multi winding transformer, comprise input series connection converter cell 1, the sinusoidal wave transformer 2 of many windings medium and low frequency and input parallel converters unit 3, below introduce respectively.
It is natural number that described input series connection converter cell 1 comprises n(n, and the current transformer submodule SM4 that n >=1) individual structure is identical, each current transformer submodule 4 all has input and output, after the input order forward series connection of n current transformer submodule 4, the positive pole of the input string formed connects on high-tension side anodal P end, and the negative pole of this input string connects on high-tension side negative pole N end.
The sinusoidal wave transformer 2 of described many windings medium and low frequency comprises n identical input winding and 1 output winding, and the output of input winding and transformer submodule 4 connects one to one, this output winding can adopt single coil, also can adopt a plurality of coils parallel with one another; The sinusoidal wave transformer 2 of described many windings medium and low frequency can specifically adopt the sinusoidal wave single-phase transformer of many windings medium and low frequency or the sinusoidal wave three-phase transformer of many windings medium and low frequency.
It is natural number that described input parallel converters unit 3 comprises m(m, and the current transformer submodule SM5 that m >=1) individual structure is identical, and the input of all current transformer submodules 5 connects respectively the output winding of the sinusoidal wave transformer 2 of many windings medium and low frequency, and the output of current transformer submodule 5 requires to select according to the low-pressure side electric pressure connected mode that adopts series, parallel or connection in series-parallel to mix.
During work, input series connection converter cell 1 is shaped to the medium and low frequency sine voltage by the direct voltage of input, carry out medium and low frequency by the sinusoidal wave transformer 2 of many windings medium and low frequency again and send energy, voltage transformation and electrical isolation, wherein, the medium and low frequency frequency range is 30Hz～500Hz; Described input parallel converters unit 3 is reduced into direct voltage by the medium and low frequency sine voltage of aforementioned input, is exported.
When through-put power is low, generally select the sinusoidal wave single-phase transformer of many windings medium and low frequency to carry out power delivery, under this application, the topological structure of comparatively typical current transformer submodule SM has two level single-phase semi-bridge LC filtering topologys (as Fig. 2), two level single-phase semi-bridge LCL filtering topologys (as Fig. 3), two level single-phase full bridge LC filtering topologys (as Fig. 4), two level single-phase full bridge LCL filtering topologys (as Fig. 5), tri-level single phase neutral point clamp half-bridge LC filtering topology (as Fig. 6), tri-level single phase neutral point clamp half-bridge LCL filtering topology (as Fig. 7), tri-level single phase striding capacitance half-bridge LC filtering topology (as Fig. 8) and tri-level single phase striding capacitance half-bridge LCL filtering topology (as Fig. 9), left side in earlier figures 2 to Fig. 9 connects DC terminal, and right side connects to exchange holds.
When through-put power is higher, generally select the sinusoidal wave three-phase transformer of many windings medium and low frequency to carry out power delivery, under this application, the topological structure of comparatively typical current transformer submodule SM has two level three phase full bridge LC filtering topologys (as Figure 10 and Figure 12), two level three phase full bridge LCL filtering topologys (as Figure 11 and Figure 13), three level three-phase neutral point clamp full-bridge LC filtering topologys (as Figure 14 and Figure 16) and three level three-phase neutral point clamp full-bridge LCL filtering topologys (as Figure 15 and Figure 17); Left side in aforementioned Figure 10 to Figure 17 connects DC terminal, and right side connects to exchange holds.
It needs to be noted, in the present invention, all current transformer submodules 4 in input series connection converter cell 1 all adopt identical structure, all current transformer submodules 5 in input parallel converters unit 3 all adopt identical structure, but the structure of high current transformer submodule 4,5 can be identical or different; For example, when current transformer submodule 4 adopts two level three phase full bridge LCL filtering topological structures, current transformer submodule 5 can adopt identical topological structure, also can adopt other topological structure, as two level three phase full bridge LC filtering topological structures.
Above embodiment only, for explanation technological thought of the present invention, can not limit protection scope of the present invention with this, every technological thought proposed according to the present invention, and any change of doing on the technical scheme basis, within all falling into protection range of the present invention.
Claims (8)
1. high voltage direct current-the DC converter based on multi winding transformer, is characterized in that: comprise input series connection converter cell, the sinusoidal wave transformer of many windings medium and low frequency and input parallel converters unit;
Described input series connection converter cell comprises the first current transformer submodule that at least one structure is identical, and when comprising first a current transformer submodule, the input of this first current transformer submodule is connected between on high-tension side positive pole and negative pole; When comprising that 2 or 2 when above, are connected between on high-tension side positive pole and negative pole after the series connection of the input of all the first current transformer submodules order forward;
The sinusoidal wave transformer of described many windings medium and low frequency comprises at least one input winding and an output winding, the quantity of described input winding is identical with the quantity of the first current transformer submodule, and the output of input winding and the first current transformer submodule connects one to one;
Described input parallel converters unit comprises the second current transformer submodule that at least one structure is identical, and the input of all the second current transformer submodules all connects the output winding of the sinusoidal wave transformer of many windings medium and low frequency; If while comprising more than 2 or 2 the second current transformer submodule, the connected mode that the output of all the second current transformer submodules adopts series, parallel or connection in series-parallel to mix.
2. a kind of high voltage direct current-DC converter based on multi winding transformer as claimed in claim 1, is characterized in that: the sinusoidal wave single-phase transformer of the sinusoidal wave many windings of transformer adopting of described many windings medium and low frequency medium and low frequency or the sinusoidal wave three-phase transformer of many windings medium and low frequency.
3. a kind of high voltage direct current-DC converter based on multi winding transformer as claimed in claim 1, is characterized in that: a coil of output winding employing of the sinusoidal wave transformer of described many windings medium and low frequency, or at least two coils parallel with one another.
4. a kind of high voltage direct current-DC converter based on multi winding transformer as described as any one in claims 1 to 3, it is characterized in that: described first and second current transformer submodule comprises passive filter module and the power conversion module of order series connection, wherein, the power conversion module adopts two Level Full Bridge topologys, many level half-bridges topology or many Level Full Bridges topology, and passive filter module adopts LC filter circuit or LCL filter circuit.
5. a kind of high voltage direct current-DC converter based on multi winding transformer as claimed in claim 4, it is characterized in that: the sinusoidal wave single-phase transformer of the sinusoidal wave many windings of transformer adopting of described many windings medium and low frequency medium and low frequency, first, the topological structure of two current transformer submodules adopts two level single-phase semi-bridge LC filtering topologys, two level single-phase semi-bridge LCL filtering topologys, two level single-phase full bridge LC filtering topologys, two level single-phase full bridge LCL filtering topologys, tri-level single phase neutral point clamp half-bridge LC filtering topology, tri-level single phase neutral point clamp half-bridge LCL filtering topology, tri-level single phase striding capacitance half-bridge LC filtering topology or tri-level single phase striding capacitance half-bridge LCL filtering topology.
6. a kind of high voltage direct current-DC converter based on multi winding transformer as claimed in claim 4, it is characterized in that: the sinusoidal wave three-phase transformer of the sinusoidal wave many windings of transformer adopting of described many windings medium and low frequency medium and low frequency, the topological structure of first and second current transformer submodule adopts two level three phase full bridge LC filtering topologys, two level three phase full bridge LCL filtering topologys, three level three-phase neutral point clamp full-bridge LC filtering topology or three level three-phase neutral point clamp full-bridge LCL filtering topologys.
7. a kind of high voltage direct current-DC converter based on multi winding transformer as claimed in claim 6 is characterized in that: in described first and second current transformer submodule, the capacitor group in passive filter module adopts the Y type to connect or the △ type connects.
8. a kind of high voltage direct current-DC converter based on multi winding transformer as claimed in claim 4, it is characterized in that: the structure of described first and second current transformer submodule is identical or different.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103944400A (en) * | 2014-04-29 | 2014-07-23 | 上海交通大学 | Bidirectional high-voltage DC/DC topological structure of multi-coil single-phase intermediate-frequency square wave transformer |
| CN104333250A (en) * | 2014-10-13 | 2015-02-04 | 华南理工大学 | Low-voltage stress diode clamped multilevel inverter using a novel three-terminal switching network |
| CN104333251A (en) * | 2014-10-13 | 2015-02-04 | 华南理工大学 | Flying capacitor voltage-clamped multilevel inverter adopting novel three-terminal switching network |
| 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 |
| CN110011544A (en) * | 2019-05-14 | 2019-07-12 | 江苏师范大学 | A kind of multiport input source isolated form Z DC converter |
| CN113014086A (en) * | 2021-03-08 | 2021-06-22 | 东南大学 | Direct-current transformer topological structure with high voltage transmission ratio and control method thereof |
| CN117674063A (en) * | 2024-02-01 | 2024-03-08 | 中科智寰(北京)科技有限公司 | Direct-current electric energy router and photovoltaic access direct-current load power supply system |
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| CN101345473A (en) * | 2008-05-04 | 2009-01-14 | 南京航空航天大学 | Input-series-output-parallel automatic voltage equalizing DC transformer based on full-bridge topological structure |
| CN101795081A (en) * | 2010-03-03 | 2010-08-04 | 中国科学院电工研究所 | Power electronic transformer having multi-winding isolation transformer |
| CN102820797A (en) * | 2012-07-10 | 2012-12-12 | 东营爱特机电技术有限责任公司 | Inverter device adopting multi-winding transformer and multi-H-bridge structure and voltage output method thereof |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103944400A (en) * | 2014-04-29 | 2014-07-23 | 上海交通大学 | Bidirectional high-voltage DC/DC topological structure of multi-coil single-phase intermediate-frequency square wave transformer |
| CN103944400B (en) * | 2014-04-29 | 2017-03-15 | 上海交通大学 | The bidirectional high-pressure DC/DC topological structure of multi-coil single-phase mid-frequency square-wave transformer |
| CN104333250A (en) * | 2014-10-13 | 2015-02-04 | 华南理工大学 | Low-voltage stress diode clamped multilevel inverter using a novel three-terminal switching network |
| CN104333251A (en) * | 2014-10-13 | 2015-02-04 | 华南理工大学 | Flying capacitor voltage-clamped multilevel inverter adopting novel three-terminal switching network |
| 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 |
| CN110011544A (en) * | 2019-05-14 | 2019-07-12 | 江苏师范大学 | A kind of multiport input source isolated form Z DC converter |
| CN113014086A (en) * | 2021-03-08 | 2021-06-22 | 东南大学 | Direct-current transformer topological structure with high voltage transmission ratio and control method thereof |
| CN113014086B (en) * | 2021-03-08 | 2022-02-01 | 东南大学 | Direct-current transformer topological structure with high voltage transmission ratio and control method thereof |
| CN117674063A (en) * | 2024-02-01 | 2024-03-08 | 中科智寰(北京)科技有限公司 | Direct-current electric energy router and photovoltaic access direct-current load power supply system |
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Application publication date: 20131204 |