CN204578370U - High-voltage direct current-direct current power electronic transformer - Google Patents
High-voltage direct current-direct current power electronic transformer Download PDFInfo
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- CN204578370U CN204578370U CN201520086392.8U CN201520086392U CN204578370U CN 204578370 U CN204578370 U CN 204578370U CN 201520086392 U CN201520086392 U CN 201520086392U CN 204578370 U CN204578370 U CN 204578370U
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Abstract
The utility model relates to a high voltage direct current-direct current power electronic transformer, which connects a modularized double-active full-bridge power unit according to an input series output parallel mode, and realizes the output of specific voltage by controlling the on and off of an IGBT electronic switch device on the power unit; the double-active full-bridge power unit is formed by connecting H full-bridges which are symmetrical left and right through a high-frequency transformer, the left side is an inversion side, the right side is a rectification side, and the used electronic switching device is a full-control switching device IGBT; the high-voltage side of the high-voltage DC-DC power electronic transformer adopts the series connection of the high-voltage ports of the double-active full-bridge power units, and the low-voltage side adopts the parallel connection of the low-voltage ports of the double-active full-bridge power units. The device not only realizes the voltage grade conversion and the electrical isolation of high and low voltage, but also can realize the active control of voltage, current and power.
Description
Technical field
The utility model relates to a kind of high voltage direct current-direct current power electronic transformer.
Background technology
At present, because the particularity that the energy of China and power load distribute, building Large Copacity, at a distance transmission system becomes certainty.Compared with traditional ac transmission, direct current transportation has that loss is little, long transmission distance, good stability and the advantage such as through-put power capacity is large, obtains more and more wide application.But direct current transportation is not just also directly used in power consumption equipment as a kind of miscellaneous function of ac transmission, so still need to connect Industrial Frequency Transformer in the inverter side of direct current transportation, increase volume and the weight of whole system.
And along with the development in the fields such as electric automobile, distributed power generation, energy-storage system, renewable energy power generation, demand high voltage direct current transmission being directly used in power consumption equipment continues to increase.So need and exchange the functionally similar direct current transformation device of isolating transformer, high voltage direct current is converted to the different brackets direct voltage of isolation to meet various power consumption equipment.
Therefore, high voltage direct current-direct current power electronic transformer directly can meet the galvanic user of a part of demand, does not need to use Industrial Frequency Transformer to carry out converting electrical energy, reduces cost, reduces loss, can also realize the two-way flow of energy.Along with the fast development of direct current transmission and distribution, high voltage direct current-direct current power electronic transformer has larger application prospect in DC distribution.
Summary of the invention
The purpose of this utility model is design a kind of high voltage direct current-direct current power electronic transformer (DCSST), this transformer by modular two initiatively full-bridge (DAB) power cell according to input series and output parallel (input-seriesoutput-paralleled, ISOP) mode connects, by controlling the conducting of IGBT electronic switching device on power cell and turning off the output realizing specific voltage.The DAB power cell of commutator transformer adopts symmetrical structure, and left side is H full-bridge inverter structure, and right side is H full-bridge rectifier structure, and centre is coupled together by high frequency transformer, achieves electrical isolation.It has bidirectional power transmission, modular construction, power density high and soft switch technique and the advantage such as easily to realize.
For achieving the above object, the utility model takes following technical scheme to realize:
A kind of high voltage direct current-direct current power electronic transformer, modular two initiatively full bridge power unit connects according to input series and output parallel mode, by controlling the conducting of IGBT electronic switching device on power cell and turning off the output realizing specific voltage by this transformer; Described two initiatively full bridge power unit are connected to form by high frequency transformer by symmetrical H full-bridge, and the left side is inverter side, and the right is rectification side, and the electronic switching device used is full-controlled switch device IGBT; Described high voltage direct current-direct current power electronic transformer high-pressure side adopts the series connection of two initiatively full bridge power unit high pressure port, and low-pressure side adopts two initiatively full bridge power unit low-pressure port in parallel.
Described high voltage direct current-direct current power electronic transformer, not only achieves electric pressure conversion and the electrical isolation of high-low pressure, can also realize the ACTIVE CONTROL of voltage, electric current and power.
Compared with prior art, the ISOP type DCSST be made up of DAB has following advantage:
1) adopt cascade of power units mode, can select the cascade number of power cell according to user's request, overall flexibility is higher;
2) input voltage of each module is Udc/n, and wherein Udc is total input voltage, and n is power cell progression, significantly can reduce the stress of switching device, reduces cost;
3) each module power output is P/n, and wherein P is total power output, make single power module design and system thermal design simpler;
4) if adopt Interleaved control technology, electric current output ripple can be reduced to a great extent;
5) owing to having given up traditional Industrial Frequency Transformer, directly have employed high frequency transformer, realize electrical isolation, further increase the degree of modularity and the power density of system, reduce noise, reduce cost.
6) this topology can realize the two-way flow of energy, can meet connection direct-current grid being accessed distribution and realize various different voltage levels direct current power distribution network.
Accompanying drawing explanation
Fig. 1 is dc-dc power electronic transformer (DCSST) topological diagram.
Fig. 2 is two initiatively full bridge power unit (DAB) structure chart of high-frequency isolation.
Fig. 3-1 is the basic functional principle figure of traditional AC electric power systems.
Fig. 3-2 is the basic functional principle figure adopting DAB unit AC electric power systems.
Fig. 4 is power cell (DAB) dual phase shift (DPS) control principle drawing.
Embodiment
Below in conjunction with accompanying drawing, concrete technical scheme of the present utility model is described in detail.
The topology (Fig. 1) of the high voltage direct current-direct current power electronic transformer (DCSST) of the utility model design is mainly based on two initiatively full-bridge DC/DC converter (DAB) of high-frequency isolation, the high-pressure side of DCSST adopts DAB unit (Fig. 2 is the concrete structure chart of DAB unit) high pressure port series connection, and low-pressure side adopts DAB power cell low-pressure port in parallel.
DAB unit is connected to form by high frequency transformer by symmetrical H full-bridge.The left side is inverter side, and the right is rectification side, and the electronic switching device that they use is all full-controlled switch device IGBT.The DAB unit of this structure and the basic functional principle (Fig. 3-1, Fig. 3-2) of traditional AC electric power systems in fact can equivalent become to be connected to two alternating current sources at inductance two ends, by the direction and the size that regulate phase in-migration between the two to change flow of power.Different places is that in conventional AC electric power system, alternating current source is power frequency sine wave, and in DAB is high frequency square wave.In figure, L is auxiliary induction and transformer leakage inductance sum, V
1and V
2be respectively full-bridge H
1and H
2dC terminal voltage, V
h1for full-bridge H
1ac output voltage, V
h2for full-bridge H
2interchange export be folded to V
2the voltage of rear flank, i
lfor inductive current.
In this design, the DAB unit basic control method of DCSST have employed dual phase shift (dual-phase-shift, DPS) and controls (Fig. 4), and in figure, Q1-Q4 is full-bridge H
1switching device, S1-S4 is full-bridge H
2switching device.Compared with controlling with traditional single phase shift (single-phase-shift), except in same H bridge, between brachium pontis, in existence, phase shift is than D1, also between the left and right sides H bridge of DAB unit, D2 is compared in the outer phase shift of existence.DPS is controlled, in efficiency characteristic, current stress, soft-switching range etc., has certain advantage, and IGBT state, without the need to changing, only needs to regulate phase shifting angle when power direction changes.From every side, DPS controls to be a kind of method being worth promoting in DAB control.
The overall control strategy of DCSST have employed distributed AC servo system and management, make each subelement have identical Controlling model, use soft switch technique, improve stability and the dynamic property of system; In hardware designs, have employed modular mentality of designing, be conducive to installation and maintenance and the System Expansion of equipment, power cell progression can be revised arbitrarily according to the demand of client and meet design.
In the DCSST designed by the utility model, there are three kinds of mode of operations, are respectively HV voltage mode control, LV voltage mode control and power control mode.And each subelement has identical Controlling model, be made up of HV voltage controller, HV current controller, LV voltage controller, LV current controller, balance controller respectively.
(1) pattern 1:HV voltage mode control.In HV voltage mode control, low-voltage direct (LVDC) busbar voltage is fixed, and high voltage direct current (HVDC) busbar voltage is controlled by commutator transformer, and flow of power size and Orientation is then determined by load.Now HV voltage and current controller is enabled, and each DAB controls respective high-pressure side voltage, and ensures that respective voltage is equal, with load-sharing.
(2) pattern 2:LV voltage mode control.In LV voltage mode control, HVDC busbar voltage is fixed, and LVDC busbar voltage is controlled by DCSST.In addition, commutator transformer also needs to control the balance of voltage of each DAB unit at series connection end and the power-balance of parallel connected end, and flow of power size and Orientation is then determined by load.Now LV voltage and current controller and balance controller are enabled.In LV control model, the error between busbar voltage and reference value is sent into pi regulator by LV voltage controller, and the output of pi regulator is as each DAB cell current inner ring reference value.
(3) mode 3: power control mode.In power control mode, high-low pressure busbar voltage is all fixing, and commutator transformer controls the size and Orientation of flow of power, and controls each DAB unit at the balance of voltage and parallel connected end power-balance held of connecting.Now DCSST state of a control and LV voltage mode control substantially similar, difference is in power control mode, only have LV current controller and balance controller enable, the reference value of LV current controller calculates according to the size of through-put power.
DCSST designed by the utility model not only achieves electric pressure conversion and the electrical isolation of high-low pressure, the ACTIVE CONTROL of voltage, electric current and power can also be realized, compare AC transformer, the shift step of DCSST is less, therefore there is higher conversion efficiency, there is larger application prospect in DC distribution.
Claims (1)
1. high voltage direct current-direct current power electronic transformer, it is characterized in that, modular two initiatively full bridge power unit connects according to input series and output parallel mode, by controlling the conducting of IGBT electronic switching device on power cell and turning off the output realizing specific voltage by this transformer; Described two initiatively full bridge power unit are connected to form by high frequency transformer by symmetrical H full-bridge, and the left side is inverter side, and the right is rectification side, and the electronic switching device used is full-controlled switch device IGBT; Described high voltage direct current-direct current power electronic transformer high-pressure side adopts the series connection of two initiatively full bridge power unit high pressure port, and low-pressure side adopts two initiatively full bridge power unit low-pressure port in parallel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520086392.8U CN204578370U (en) | 2015-02-04 | 2015-02-04 | High-voltage direct current-direct current power electronic transformer |
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| CN201520086392.8U CN204578370U (en) | 2015-02-04 | 2015-02-04 | High-voltage direct current-direct current power electronic transformer |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104578803A (en) * | 2015-02-04 | 2015-04-29 | 荣信电力电子股份有限公司 | High-voltage direct current-direct current power electronic transformer |
| CN108418431A (en) * | 2018-02-27 | 2018-08-17 | 许继电气股份有限公司 | Phase-shifted PWM Control Method and submodule block controller applied to ISOP DC converters |
| CN109039081A (en) * | 2018-06-20 | 2018-12-18 | 中国科学院电工研究所 | Electric power electric transformer, two-way DC converter and its control method |
| CN113364293A (en) * | 2021-06-28 | 2021-09-07 | 潍柴动力股份有限公司 | DC/DC conversion circuit control method and device and DC/DC converter |
| CN114244152A (en) * | 2021-11-12 | 2022-03-25 | 深圳供电局有限公司 | Full-bridge synchronous rectifying device and wireless charging system |
| CN115864850A (en) * | 2022-12-26 | 2023-03-28 | 北京索英电气技术股份有限公司 | Electronic transformer and direct current transmission system |
-
2015
- 2015-02-04 CN CN201520086392.8U patent/CN204578370U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104578803A (en) * | 2015-02-04 | 2015-04-29 | 荣信电力电子股份有限公司 | High-voltage direct current-direct current power electronic transformer |
| CN108418431A (en) * | 2018-02-27 | 2018-08-17 | 许继电气股份有限公司 | Phase-shifted PWM Control Method and submodule block controller applied to ISOP DC converters |
| CN109039081A (en) * | 2018-06-20 | 2018-12-18 | 中国科学院电工研究所 | Electric power electric transformer, two-way DC converter and its control method |
| CN113364293A (en) * | 2021-06-28 | 2021-09-07 | 潍柴动力股份有限公司 | DC/DC conversion circuit control method and device and DC/DC converter |
| CN114244152A (en) * | 2021-11-12 | 2022-03-25 | 深圳供电局有限公司 | Full-bridge synchronous rectifying device and wireless charging system |
| CN115864850A (en) * | 2022-12-26 | 2023-03-28 | 北京索英电气技术股份有限公司 | Electronic transformer and direct current transmission system |
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| CP03 | Change of name, title or address |
Address after: 114051, Liaoning, Anshan MTR Eastern Science and technology road, No. 108 Patentee after: MONTNETS RONGXIN TECHNOLOGY GROUP CO.,LTD. Patentee after: LIAONING RONGXIN ZHONGTENG TECHNOLOGY Co.,Ltd. Patentee after: Shenzhen Power Supply Co.,Ltd. Address before: 114051 Anshan high tech Zone, Liaoning province science and technology road, No. 108 Patentee before: RONGXIN POWER ELECTRONIC Co.,Ltd. Patentee before: LIAONING RONGXIN ZHONGTENG TECHNOLOGY Co.,Ltd. Patentee before: Shenzhen Power Supply Co.,Ltd. |
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| TR01 | Transfer of patent right |
Effective date of registration: 20160902 Address after: 114051, Liaoning, Anshan MTR Eastern Science and technology road, No. 108 Patentee after: MONTNETS RONGXIN TECHNOLOGY GROUP CO.,LTD. Patentee after: Shenzhen Power Supply Co.,Ltd. Address before: 114051, Liaoning, Anshan MTR Eastern Science and technology road, No. 108 Patentee before: MONTNETS RONGXIN TECHNOLOGY GROUP CO.,LTD. Patentee before: LIAONING RONGXIN ZHONGTENG TECHNOLOGY Co.,Ltd. Patentee before: Shenzhen Power Supply Co.,Ltd. |
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| TR01 | Transfer of patent right |
Effective date of registration: 20200410 Address after: 114000 Anshan City, Liaoning, the East District of science and Technology Road No. 108 Co-patentee after: Shenzhen Power Supply Co.,Ltd. Patentee after: LIAONING RONGXIN INDUSTRIAL ELECTRIC POWER TECHNOLOGY CO.,LTD. Address before: 114051, No. 108, science Road, MTR East, Liaoning, Anshan Co-patentee before: Shenzhen Power Supply Co.,Ltd. Patentee before: MONTNETS RONGXIN TECHNOLOGY GROUP Co.,Ltd. |