CN104578889A - Transformer-free distributed power router - Google Patents
Transformer-free distributed power router Download PDFInfo
- Publication number
- CN104578889A CN104578889A CN201410822176.5A CN201410822176A CN104578889A CN 104578889 A CN104578889 A CN 104578889A CN 201410822176 A CN201410822176 A CN 201410822176A CN 104578889 A CN104578889 A CN 104578889A
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- CN
- China
- Prior art keywords
- submodule
- brachium pontis
- modularization
- series
- bleeder circuit
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
- H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
- H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/79—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/797—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
Abstract
The invention belongs to the technical field of power conversion, and particularly relates to a transformer-free distributed power router. The power router comprises a modular multi-level converter and a modular voltage division circuit, wherein the modular multi-level converter comprises three phase units, each phase unit is formed by connecting an upper bridge arm and a lower bridge arm in series, the positive pole of each upper bridge arm is connected with the positive pole of the modular voltage division circuit, the negative pole of each upper bridge arm is connected with the positive pole of each lower bridge arm and a certain phase in a power grid, and the negative pole of each lower bridge arm is connected with the negative pole of the modular voltage division circuit; each upper bridge arm or each lower bridge arm of each phase is formed by connecting positive and negative poles of n identical sub-modules in series and connecting an electric reactor in series; the modular voltage division circuit is formed by connecting positive and negative poles of k identical sub-modules in series and connecting an electric reactor in series. With the adoption of the power router, the power conversion efficiency can be effectively improved, and multiple channels of direct-current output can be provided; simultaneous connection of various distributed power storage devices can be facilitated by multi-end input, the system reliability is improved, and meanwhile, the efficiency is improved.
Description
Technical field
The invention belongs to power converter technical field, particularly relate to a kind of transformerless distributed power router.
Background technology
Modularization multi-level converter (Modular Multilevel Converter, MMC) after proposition, with the structure of its high modularization, there is common DC bus, be convenient to Project Realization, there is unbalanced operation ability and the feature such as fault traversing and recovery capability, be subject to the favor of domestic and international researcher, high voltage direct current transmission (High-Voltage Direct Current is widely used in by domestic and international researcher, HVDC), the field such as quality of power supply, be the main devices of AC/DC converter, will play a significant role in the construction of following electrical network.
Tradition adopts modularization multi-level converter to realize in the example of AC/DC bi-directional conversion, because DC/DC conversion is subject to the restriction of duty ratio in the power converter process that voltage span is larger, needs transformer as medium to add interchange link.Adding of transformer, add the complexity of system and affect power conversion efficiency; And, modularization multi-level converter only provides a road direct current to export to DC side, DC bus is that each DC side load shares, when this DC bus breaks down by affect this DC bus with all DC loads, and fault effects busbar voltage, just be difficult to effectively control fault impact scope, be unfavorable for the stable operation of system, so just higher performance requirement is proposed to DC load.And DC bus-bar voltage and load and distributed energy required voltage are difficult to fit like a glove, therefore usually still need through the process of one-level power converter, and the current transformer fault of this grade of conversion still can be powered or regenerative resource access brings detrimental effects to load.Meanwhile, during as DC/AC converter, the access requirement of the different direct voltage of the different distributions formula energy cannot be met.
Summary of the invention
The I/O of multi-channel DC bus cannot be provided for traditional bi-directional inverter, need the shortcoming of transformer, the present invention proposes and provide the one of multi-channel DC I/O transformerless distributed power router.
A kind of transformerless distributed power router, comprising: modularization multi-level converter and modularization bleeder circuit; Wherein, modularization multi-level converter comprises three facies units, each facies unit by upper brachium pontis and lower brachium pontis in series, the positive pole of upper brachium pontis is connected with the positive pole of modularization bleeder circuit, the negative pole of upper brachium pontis is connected with a certain in the positive pole of lower brachium pontis and electrical network, and the negative pole of lower brachium pontis is connected with the negative pole of modularization bleeder circuit;
The upper brachium pontis of each phase or lower brachium pontis be in series by the both positive and negative polarity of the identical submodule of n respectively and and a reactor in series, n is positive integer; The positive pole of the submodule of the head end in n sub-series module in formation in brachium pontis constitutes the positive pole of brachium pontis, and the negative pole of the submodule of the end in n sub-series module in formation in brachium pontis constitutes the negative pole of brachium pontis; The positive pole forming the submodule of the head end in n sub-series module in lower brachium pontis constitutes the positive pole of lower brachium pontis; The negative pole forming the submodule of the end in n sub-series module in lower brachium pontis constitutes the negative pole of lower brachium pontis;
Modularization bleeder circuit be in series by the both positive and negative polarity of the identical submodule of k and and a reactor in series, k is positive integer, the positive pole of the submodule of the head end in k sub-series module in composition module bleeder circuit constitutes the positive pole of modularization bleeder circuit, and the negative pole of the submodule of the end in k sub-series module in composition module bleeder circuit constitutes the negative pole of modularization bleeder circuit.
Described submodule forms with Capacitance parallel connection after being connected by two IGBT being connected to anti-paralleled diode respectively again, and the point that the emitter wherein going up IGBT is connected with the collector electrode of lower IGBT is as the positive pole of submodule, and the emitter of lower IGBT is as the negative pole of submodule.
Described power router is divided into rectification and inversion two operating states:
When modularization multi-level converter is operated in rectification state, number is opened by what control its upper and lower bridge arm submodule, the number sum of opening of upper and lower bridge arm is always n, modularization multi-level converter DC side is made to export the direct voltage of certain voltage value, by the operating state of each submodule IGBT of control module bleeder circuit, make this output dc voltage realize dividing potential drop in k submodule of modularization bleeder circuit, thus realize multiple-channel output;
When modularization multi-level converter is operated in inverter mode, multichannel input is realized by each submodule of modularization bleeder circuit, its submodule respectively holds input voltage to support modularization multi-level converter DC voltage, number is opened by control module multilevel converter upper and lower bridge arm submodule, the number sum of opening of upper and lower bridge arm is always n, makes modularization multi-level converter AC export the alternating voltage of certain voltage value.
Described power router is divided into energy storage and gets energy two courses of work:
Thermal energy storage process: by the AC input three-phase alternating current of modularization multi-level converter, by controlling the operating state of IGBT in submodule, its DC side is made to export the direct voltage of certain value, through the submodule of reactor and series connection, the direct current obtaining multichannel exports, to meet different distributions formula energy storage device to the requirement of voltage, thus by electrical power storage in energy storage device;
Get energy process: by the multiterminal element input access distributed energy storage device of modularization bleeder circuit, access while the input of multiterminal then can realize multiple distributed energy storage device, by modularization multi-level converter, control the running status of its submodule, realize direct current to the conversion exchanged.
Beneficial effect of the present invention is: when system works is under rectification state, and bleeder circuit, by the higher direct step-down of public direct-current side voltage, effectively can improve power conversion efficiency, and multi-channel DC can be provided to export; When system works is under inverter mode, modularization bleeder circuit provides multi-channel DC to input, the input of multiterminal is conducive to multiple distributed energy storage device and accesses simultaneously, improves system reliability and improves efficiency simultaneously, show superiority compared with traditional bi-directional inverter; Thoroughly solve traditional bi-directional inverter and cannot provide the I/O of multi-channel DC bus and the problem needing transformer.
Accompanying drawing explanation
Fig. 1 is the topological structure schematic diagram of a kind of transformerless distributed power router of the present invention.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment is elaborated.
A kind of transformerless distributed power router, as shown in Figure 1, comprising: modularization multi-level converter and modularization bleeder circuit; Wherein, modularization multi-level converter comprises three facies units, each facies unit by upper brachium pontis and lower brachium pontis in series, the positive pole of upper brachium pontis is connected with the positive pole of modularization bleeder circuit, the negative pole of upper brachium pontis is connected with a certain in the positive pole of lower brachium pontis and electrical network, and the negative pole of lower brachium pontis is connected with the negative pole of modularization bleeder circuit;
The upper brachium pontis of each phase or lower brachium pontis be in series by the both positive and negative polarity of the identical submodule of n respectively and and a reactor in series, n is positive integer; The positive pole of the submodule of the head end in n sub-series module in formation in brachium pontis constitutes the positive pole of brachium pontis, and the negative pole of the submodule of the end in n sub-series module in formation in brachium pontis constitutes the negative pole of brachium pontis; The positive pole forming the submodule of the head end in n sub-series module in lower brachium pontis constitutes the positive pole of lower brachium pontis; The negative pole forming the submodule of the end in n sub-series module in lower brachium pontis constitutes the negative pole of lower brachium pontis;
Modularization bleeder circuit be in series by the both positive and negative polarity of the identical submodule of k and and a reactor in series, k is positive integer, the positive pole of the submodule of the head end in k sub-series module in composition module bleeder circuit constitutes the positive pole of modularization bleeder circuit, and the negative pole of the submodule of the end in k sub-series module in composition module bleeder circuit constitutes the negative pole of modularization bleeder circuit.
Described submodule forms with Capacitance parallel connection after being connected by two IGBT being connected to anti-paralleled diode respectively again, and the point that the emitter wherein going up IGBT is connected with the collector electrode of lower IGBT is as the positive pole of submodule, and the emitter of lower IGBT is as the negative pole of submodule.
Described power router is divided into rectification and inversion two operating states:
When modularization multi-level converter is operated in rectification state, number is opened by what control its upper and lower bridge arm submodule, the number sum of opening of upper and lower bridge arm is always n, modularization multi-level converter DC side is made to export the direct voltage of certain voltage value, by the operating state of each submodule IGBT of control module bleeder circuit, make this output dc voltage realize dividing potential drop in k submodule of modularization bleeder circuit, thus realize multiple-channel output;
When modularization multi-level converter is operated in inverter mode, multichannel input is realized by each submodule of modularization bleeder circuit, its submodule respectively holds input voltage to support modularization multi-level converter DC voltage, number is opened by control module multilevel converter upper and lower bridge arm submodule, the number sum of opening of upper and lower bridge arm is always n, makes modularization multi-level converter AC export the alternating voltage of certain voltage value.
Described power router is divided into energy storage and gets energy two courses of work:
Thermal energy storage process: by the AC input three-phase alternating current of modularization multi-level converter, by controlling the operating state of IGBT in submodule, its DC side is made to export the direct voltage of certain value, through the submodule of reactor and series connection, the direct current obtaining multichannel exports, to meet different distributions formula energy storage device to the requirement of voltage, thus by electrical power storage in energy storage device;
Get energy process: by the multiterminal element input access distributed energy storage device of modularization bleeder circuit, access while the input of multiterminal then can realize multiple distributed energy storage device, by modularization multi-level converter, control the running status of its submodule, realize direct current to the conversion exchanged.
The running status of submodule SM, IGBT pipe T
1conducting, IGBT pipe T
2turn off, submodule is in input state, and electric current can two-way flow, and regardless of current direction, the output voltage of submodule output is submodule capacitor voltage, and the flow direction of electric current is depended in the charge and discharge of submodule electric capacity, when electric current is through diode D
1when flowing through electric capacity, electric capacity is charged, when electric current flows to IGBT pipe T through electric capacity
1time, capacitor discharge.IGBT pipe T
1shutoff, IGBT pipe T
2conducting, submodule is in excision state, and electric current can two-way flow, and no matter the sense of current is how, and submodule output output voltage is the on-state voltage drop of switching device, in the ideal situation, can be considered 0, and the capacitance voltage of submodule is by the impact of the sense of current; IGBT pipe T
1, IGBT pipe T
2all turn off, submodule is in blocking, when electric current is through diode D
1when flowing to electric capacity, circuit to capacitor charging, when electric current only flows through diode D
2time, submodule electric capacity is bypassed, and capacitance voltage is unaffected.
The above; be only the present invention's preferably embodiment, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (4)
1. a transformerless distributed power router, is characterized in that, comprising: modularization multi-level converter and modularization bleeder circuit; Wherein, modularization multi-level converter comprises three facies units, each facies unit by upper brachium pontis and lower brachium pontis in series, the positive pole of upper brachium pontis is connected with the positive pole of modularization bleeder circuit, the negative pole of upper brachium pontis is connected with a certain in the positive pole of lower brachium pontis and electrical network, and the negative pole of lower brachium pontis is connected with the negative pole of modularization bleeder circuit;
The upper brachium pontis of each phase or lower brachium pontis be in series by the both positive and negative polarity of the identical submodule of n respectively and and a reactor in series, n is positive integer; The positive pole of the submodule of the head end in n sub-series module in formation in brachium pontis constitutes the positive pole of brachium pontis, and the negative pole of the submodule of the end in n sub-series module in formation in brachium pontis constitutes the negative pole of brachium pontis; The positive pole forming the submodule of the head end in n sub-series module in lower brachium pontis constitutes the positive pole of lower brachium pontis; The negative pole forming the submodule of the end in n sub-series module in lower brachium pontis constitutes the negative pole of lower brachium pontis;
Modularization bleeder circuit be in series by the both positive and negative polarity of the identical submodule of k and and a reactor in series, k is positive integer, the positive pole of the submodule of the head end in k sub-series module in composition module bleeder circuit constitutes the positive pole of modularization bleeder circuit, and the negative pole of the submodule of the end in k sub-series module in composition module bleeder circuit constitutes the negative pole of modularization bleeder circuit.
2. power router according to claim 1, it is characterized in that, described submodule forms with Capacitance parallel connection after being connected to the IGBT series connection of anti-paralleled diode respectively by two again, the point that the emitter wherein going up IGBT is connected with the collector electrode of lower IGBT is as the positive pole of submodule, and the emitter of lower IGBT is as the negative pole of submodule.
3. power router according to claim 1, is characterized in that, described power router is divided into rectification and inversion two operating states:
When modularization multi-level converter is operated in rectification state, number is opened by what control its upper and lower bridge arm submodule, the number sum of opening of upper and lower bridge arm is always n, modularization multi-level converter DC side is made to export the direct voltage of certain voltage value, by the operating state of each submodule IGBT of control module bleeder circuit, make this output dc voltage realize dividing potential drop in k submodule of modularization bleeder circuit, thus realize multiple-channel output;
When modularization multi-level converter is operated in inverter mode, multichannel input is realized by each submodule of modularization bleeder circuit, its submodule respectively holds input voltage to support modularization multi-level converter DC voltage, number is opened by control module multilevel converter upper and lower bridge arm submodule, the number sum of opening of upper and lower bridge arm is always n, makes modularization multi-level converter AC export the alternating voltage of certain voltage value.
4. power router according to claim 1, is characterized in that, described power router is divided into energy storage and gets energy two courses of work:
Thermal energy storage process: by the AC input three-phase alternating current of modularization multi-level converter, by controlling the operating state of IGBT in submodule, its DC side is made to export the direct voltage of certain value, through the submodule of reactor and series connection, the direct current obtaining multichannel exports, to meet different distributions formula energy storage device to the requirement of voltage, thus by electrical power storage in energy storage device;
Get energy process: by the multiterminal element input access distributed energy storage device of modularization bleeder circuit, access while the input of multiterminal then can realize multiple distributed energy storage device, by modularization multi-level converter, control the running status of its submodule, realize direct current to the conversion exchanged.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410822176.5A CN104578889A (en) | 2014-12-24 | 2014-12-24 | Transformer-free distributed power router |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410822176.5A CN104578889A (en) | 2014-12-24 | 2014-12-24 | Transformer-free distributed power router |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111244995A (en) * | 2020-03-12 | 2020-06-05 | 荣信汇科电气技术有限责任公司 | Three-phase multi-level high-voltage energy storage device and control method thereof |
| CN113013908A (en) * | 2021-03-08 | 2021-06-22 | 清华大学 | STATCOM integrated energy storage system based on MMC and direct current collector and control method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2608392A1 (en) * | 2011-12-19 | 2013-06-26 | Siemens Aktiengesellschaft | Modular Multilevel DC/AC converter comprising a series connection of DC/AC inverter sub-modules for the generation of polyphase output voltages |
| CN104113082A (en) * | 2014-07-17 | 2014-10-22 | 西安交通大学 | Modular full direct current photovoltaic system and control method thereof |
-
2014
- 2014-12-24 CN CN201410822176.5A patent/CN104578889A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2608392A1 (en) * | 2011-12-19 | 2013-06-26 | Siemens Aktiengesellschaft | Modular Multilevel DC/AC converter comprising a series connection of DC/AC inverter sub-modules for the generation of polyphase output voltages |
| CN104113082A (en) * | 2014-07-17 | 2014-10-22 | 西安交通大学 | Modular full direct current photovoltaic system and control method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111244995A (en) * | 2020-03-12 | 2020-06-05 | 荣信汇科电气技术有限责任公司 | Three-phase multi-level high-voltage energy storage device and control method thereof |
| CN113013908A (en) * | 2021-03-08 | 2021-06-22 | 清华大学 | STATCOM integrated energy storage system based on MMC and direct current collector and control method thereof |
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Application publication date: 20150429 |