CN204707045U - A kind of power distribution network electric power electric transformer - Google Patents
A kind of power distribution network electric power electric transformer Download PDFInfo
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- CN204707045U CN204707045U CN201520257917.XU CN201520257917U CN204707045U CN 204707045 U CN204707045 U CN 204707045U CN 201520257917 U CN201520257917 U CN 201520257917U CN 204707045 U CN204707045 U CN 204707045U
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Abstract
The utility model provides a kind of power distribution network electric power electric transformer, and described power distribution network electric power electric transformer comprises input stage, isolated variable level and output stage, and described output stage is provided with super capacitor; Described output stage adopts voltage-source type four bridge legs inversion topological, and the positive pole of described super capacitor is connected to four bridge legs mid point, and negative pole connects DC bus negative terminal.Power distribution network electric power electric transformer described in the utility model utilizes the inner four bridge legs serving as center line to serve as the discharge and recharge interface of super capacitor energy-storage system simultaneously, seamless link super capacitor, fast response time, without the need to additionally increasing power conversion circuit and control system, realizes flexible energy storage.
Description
Technical field
The utility model relates to field of power electronics, is specifically related to a kind of power distribution network electric power electric transformer.
Background technology
In recent years, Technics of Power Electronic Conversion technical development is rapid, its up-to-date utilization---electric power electric transformer (Power Electronic Transformer in electric power system, PET), combine high frequency transformer, the voltage transformation in electric power system and energy transferring can be realized, obtained the burning hot research of Chinese scholars.PET is applied to the real-time control that power distribution network outstanding feature is AC voltage magnitude and phase place, can realize the flexible of transformer primary secondary voltage, electric current and power, therefore possesses the potentiality solving many new problems in electric power system, has a extensive future.
But, power distribution network electric power electric transformer (Distribution Power ElectronicTransformer, DPET) runs on electrical network end, and running environment is complicated, high side voltage is unstable, and the voltage degree of depth caused by fault is fallen and happened occasionally with short supply interruption situation.Configuration in the line possesses the power electronic equipment of super capacitor (Super Capacitor, SC) energy storage, and carrying out voltage compensation when supply voltage falls, is a kind of widely used measure.Be typically chosen in extra increase SC energy-storage system on DPET low-voltage direct bus in prior art, although can compensation effect be reached like this, such a process increases extra DC/DC power conversion circuit, add system cost, and make compensation response speed slack-off.
Utility model content
For defect of the prior art, the utility model provides a kind of power distribution network electric power electric transformer, additionally on DPET low-voltage direct bus increases SC energy-storage system and the system cost that causes increases and compensates the slack-off problem of response speed to solve in prior art.
For solving the problem, the utility model provides following scheme:
The utility model provides a kind of power distribution network electric power electric transformer, comprises input stage, isolated variable level and output stage, described output stage is provided with super capacitor;
Described output stage adopts voltage-source type four bridge legs inversion topological, and the positive pole of described super capacitor is connected to four bridge legs mid point, and negative pole connects DC bus negative terminal.
Wherein, described power distribution network electric power electric transformer carries out discharge and recharge by brachium pontis power device to described super capacitor.
Wherein, described input stage adopts cascaded H-bridges many level HM topology, and the HM chain link module-cascade that each brachium pontis is n by quantity forms, and HM chain link module main circuit is H bridge construction, three brachium pontis are connected to form by Y type, are the direct current of the suspension of 3n by high pressure industrial frequency AC formation number.
Wherein, each unit of described isolated variable level adopts two initiatively bridge topology DAB, and total unit number is 3n, and each DAB side is connected with HM chain link, and opposite side composes in parallel DC bus.
Wherein, described super capacitor is in series with inductance, to reduce current ripple.
As shown from the above technical solution, power distribution network electric power electric transformer described in the utility model, utilize the inner four bridge legs serving as center line to serve as the discharge and recharge interface of super capacitor energy-storage system simultaneously, seamless link super capacitor, fast response time, without the need to additionally increasing power conversion circuit and control system, realize flexible energy storage.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the electrical block diagram of the power distribution network electric power electric transformer that the utility model embodiment provides.
Embodiment
For making the object of the utility model embodiment, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the utility model embodiment, clear, complete description is carried out to the technical scheme in the utility model embodiment, obviously, described embodiment is the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Fig. 1 shows the electrical block diagram of the power distribution network electric power electric transformer that the utility model embodiment provides, the power distribution network electric power electric transformer that the present embodiment provides is a kind of power distribution network electric power electric transformer interactive flexibly with super capacitor (Super Capacitor basedDistribution Power Electronic Transformer is called for short SCDPET).The four bridge legs that the SCDPET that the present embodiment provides utilizes DPET inside to serve as center line serves as the discharge and recharge interface of super capacitor energy-storage system simultaneously, and seamless link super capacitor, without the need to additionally increasing power conversion circuit and control system, realizes flexible energy storage.As shown in Figure 1, the SCDPET that the present embodiment provides comprises: input stage, isolated variable level and output stage, described output stage is provided with super capacitor, and namely output stage is integrated with super capacitor energy-storage system, as shown in Figure 1.
Described output stage adopts voltage-source type four bridge legs inversion topological, and the positive pole of described super capacitor is connected to four bridge legs mid point, and negative pole connects DC bus negative terminal.
Wherein, described power distribution network electric power electric transformer carries out discharge and recharge by brachium pontis power device to described super capacitor.
Wherein, described input stage adopts the many level of cascaded H-bridges (Cascade H-bridgeMulti-level, CHM) topology, the HM chain link module-cascade that each brachium pontis is n by quantity forms, HM chain link module main circuit is H bridge construction, 3 brachium pontis are connected to form by Y type, are the direct current of the suspension of 3n by high pressure industrial frequency AC formation number, and cascaded multilevel structure makes input stage power device can be applied to high-power with less voltage stress and switching frequency.
Wherein, each unit of described isolated variable level adopts two initiatively bridge topology (Dual ActiveBridge, DAB), controls energy in bidirectional flow; Total unit number is 3n, and each DAB side is connected with HM chain link, and opposite side composes in parallel DC bus.
In the utility model preferred embodiment, described super capacitor is in series with inductance, and series inductance L reduces current ripples.
Described output stage adopts voltage-source type four bridge legs inversion (4-leg Voltage Source Inverter, VSI) topology, can directly control by center line electric current, and have and control flexibly, without the need to large DC-link electric capacity and the high advantage of direct voltage utilance, be suitable for power distribution network application.The positive level of super capacitor connects four bridge legs mid point, negative pole connects DC bus negative terminal (alternatively, series inductance L reduces current ripples), by controlling brachium pontis power device, discharge and recharge being carried out to super capacitor, realizing and super capacitor and DC bus energy interactions.
The SCDPET that the utility model embodiment provides, utilize the inner four bridge legs serving as center line to serve as the discharge and recharge interface of super capacitor energy-storage system, seamless link super capacitor, fast response time simultaneously, without the need to additionally increasing power conversion circuit and control system, realize flexible energy storage.The power distribution network electric power electric transformer that the utility model embodiment provides does not affect the control of four bridge legs center line electric current, possesses uninterrupted power supply ability in short-term, and possesses the power fluctuation ability to bear of superelevation, can realize the stable operation under throwing-on.
The power distribution network electric power electric transformer (i.e. SCDPET) that the present embodiment provides, utilizing four bridge legs to serve as the discharge and recharge interface of super capacitor energy-storage system simultaneously, without the need to additionally increasing power conversion circuit and control system, reducing system cost.
The power distribution network electric power electric transformer that the present embodiment provides, seamless link super capacitor, fast response time, achieves flexible energy storage.
Above embodiment, only for illustration of the technical solution of the utility model, is not intended to limit; Although be described in detail the utility model with reference to previous embodiment, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of each embodiment technical scheme of the utility model.
Claims (5)
1. a power distribution network electric power electric transformer, is characterized in that, comprises input stage, isolated variable level and output stage, described output stage is provided with super capacitor;
Described output stage adopts voltage-source type four bridge legs inversion topological, and the positive pole of described super capacitor is connected to four bridge legs mid point, and negative pole connects DC bus negative terminal.
2. power distribution network electric power electric transformer according to claim 1, is characterized in that, described power distribution network electric power electric transformer carries out discharge and recharge by brachium pontis power device to described super capacitor.
3. power distribution network electric power electric transformer according to claim 1, it is characterized in that, described input stage adopts cascaded H-bridges many level HM topology, the HM chain link module-cascade that each brachium pontis is n by quantity forms, HM chain link module main circuit is H bridge construction, three brachium pontis are connected to form by Y type, are the direct current of the suspension of 3n by high pressure industrial frequency AC formation number.
4. power distribution network electric power electric transformer according to claim 3, is characterized in that, each unit of described isolated variable level adopts two initiatively bridge topology DAB, and total unit number is 3n, and each DAB side is connected with HM chain link, and opposite side composes in parallel DC bus.
5., according to the arbitrary described power distribution network electric power electric transformer of claim 1-4, it is characterized in that, described super capacitor is in series with inductance, to reduce current ripple.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201520257917.XU CN204707045U (en) | 2015-04-27 | 2015-04-27 | A kind of power distribution network electric power electric transformer |
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| CN201520257917.XU CN204707045U (en) | 2015-04-27 | 2015-04-27 | A kind of power distribution network electric power electric transformer |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104836455A (en) * | 2015-04-27 | 2015-08-12 | 湖南大学 | Power distribution network power electronic transformer and control method thereof |
| CN106324424A (en) * | 2016-10-31 | 2017-01-11 | 广西电网有限责任公司电力科学研究院 | Method for analyzing H bridge topology state of power electronic transformer |
| CN106341044A (en) * | 2016-10-19 | 2017-01-18 | 华北电力大学（保定） | Comprehensive efficiency optimization control method for modularized power electronic transformer |
| CN109067195A (en) * | 2018-10-11 | 2018-12-21 | 华北水利水电大学 | A kind of electric power electric transformer with energy storage device |
-
2015
- 2015-04-27 CN CN201520257917.XU patent/CN204707045U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104836455A (en) * | 2015-04-27 | 2015-08-12 | 湖南大学 | Power distribution network power electronic transformer and control method thereof |
| CN104836455B (en) * | 2015-04-27 | 2017-07-11 | 湖南大学 | A kind of power distribution network electric power electric transformer and its control method |
| CN106341044A (en) * | 2016-10-19 | 2017-01-18 | 华北电力大学（保定） | Comprehensive efficiency optimization control method for modularized power electronic transformer |
| CN106341044B (en) * | 2016-10-19 | 2019-03-05 | 华北电力大学（保定） | A kind of modular power electronics transformer synthesis efficiency optimization control method |
| CN106324424A (en) * | 2016-10-31 | 2017-01-11 | 广西电网有限责任公司电力科学研究院 | Method for analyzing H bridge topology state of power electronic transformer |
| CN109067195A (en) * | 2018-10-11 | 2018-12-21 | 华北水利水电大学 | A kind of electric power electric transformer with energy storage device |
| CN113193760A (en) * | 2018-10-11 | 2021-07-30 | 华北水利水电大学 | Power electronic transformer with energy storage device |
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