CN103001254A - Alternating current and direct current hybrid micro-grid system - Google Patents
Alternating current and direct current hybrid micro-grid system Download PDFInfo
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- CN103001254A CN103001254A CN2012105117949A CN201210511794A CN103001254A CN 103001254 A CN103001254 A CN 103001254A CN 2012105117949 A CN2012105117949 A CN 2012105117949A CN 201210511794 A CN201210511794 A CN 201210511794A CN 103001254 A CN103001254 A CN 103001254A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention provides an alternating current and direct current hybrid micro-grid system, which comprises a light storage integration power supply unit, a triple supply power supply unit and a high-reliability power supply unit with chain function, wherein the light storage integration power supply unit and the triple supply power supply unit are used as dual power for the high-reliability power supply unit, and simultaneously the light storage integration power supply unit and the triple supply power supply unit respectively achieve the effects of backup power automatic switching and provide electric power for load connected with a bus. The alternating current and direct current hybrid micro-grid structure provided by the invention is updated on the basis of ensuring the existing power supply structure, the structure is further strengthened, the loading demand in different types and the electric loading demand in different levels inside a power supply area are taken into account, the power supply reliability of all loading inside the system can be improved, and simultaneously uninterrupted high-reliability power supply of important loading inside the micro-grid can be realized.
Description
Technical field
The present invention relates to miniature electric power system field, relate in particular to a kind of alternating current-direct current mixing micro-grid system.
Background technology
Microgrid refers to the miniature electric power system that is comprised of distributed power generation device, energy storage device, energy conversion device and load, and micro-grid system makes up becomes a kind of effective way that satisfies load growth demand, environmental contamination reduction, raising comprehensive utilization rate of energy source and power supply reliability gradually.Microgrid both can link to each other the mode operation that is incorporated into the power networks with large-scale power grid, also can move with island mode, and two kinds of patterns can be changed mutually under the circumstances usually, to guarantee the reliability of system power supply.In microgrid, usually adopt solar energy, wind energy, the energy storage distributed energy to generate electricity as power supply, distribute electric energy by a bus rod.This structure is with simple in structure, and operating operation is convenient for advantage, is present in widely in little electric network composition.Along with the development of little electric power network technique, the system power supply reliability requirement is also in continuous raising, and the microgrid structure of present stage can solve problems to a certain extent, but can't be guaranteed for the equipment of high reliability request more.
Publication number is that the patent application " EMS that the wind-light storage micro-grid system is incorporated into the power networks " of CN102684215A has proposed a kind of micro-grid system, this system comprises microgrid built-in system and a 10kV ac bus and some conventional loads, and microgrid inside also comprises a 380V ac bus, a cover wind generator system, a cover photovoltaic generating system, cover battery energy storage system and an an amount of on the spot load.In the above-mentioned micro-grid system, the various kinds of equipment of internal system has all been done certain integration, concentrates to be connected on the micro-grid system ac bus, and off grade was divided during internal system was loaded on the spot, when electric power supply was not enough, the cut possibility of respectively loading in the system was identical.In addition, if micro-grid system breaks down, the internal system load all can't be guaranteed supply, and important load also will lose electric energy and support.
This shows that at present, the configuration of the structure of microgrid is mainly single layer structure, the power supply reliability of respectively loading in the micro-grid system is all consistent, can't realize the load rating power supply.
Summary of the invention
Technical problem to be solved by this invention is, a kind of power supply reliability that improves all loads in the system is provided, and the alternating current-direct current mixing micro-grid system of realizing the uninterrupted high reliability power supply of important load.
The invention provides a kind of alternating current-direct current mixing micro-grid system, comprise: light stores up one power supply unit, three alliance power supply units and possesses the high reliability power supply unit of chain function, wherein, described light storage one power supply unit and three alliance power supply units form the duplicate supply of described high reliability power supply unit.
Described light storage one power supply unit further comprises DC power-supply system, AC/DC converting means, the first AC load and exchanges the microgrid bus, described DC power-supply system accesses described interchange microgrid bus by described AC/DC converting means, described the first AC load is connected on the described interchange microgrid bus, by described DC power-supply system power supply.
Described DC power-supply system further comprises photovoltaic devices, energy storage device, dc load and dc bus, described photovoltaic devices and energy storage device access described dc bus by the DC/DC converting means, described dc load is connected with described dc bus, by described photovoltaic devices and energy storage device power supply.
Described three alliance power supply units further comprise three alliance generating sets, the second AC load and three alliance ac bus, described three alliance generating sets link to each other with described the second AC load by described three alliance ac bus, to described the second AC load power supply.
Described three alliance ac bus are connected to the first bus by first switch that is incorporated into the power networks, described interchange microgrid bus is connected to the second bus by second switch that is incorporated into the power networks, described the first bus links to each other by bus connection switch with described the second bus, described the first bus is as the prepared auto restart equipment of described the second bus, and described the second bus is as the prepared auto restart equipment of described the first bus.
Described high reliability power supply unit further comprises high reliability power supply buses and important load, described important load is connected on the described high reliability power supply buses, described high reliability power supply buses is connected respectively to described the first bus and described the second bus by the interlocking-type switch, when described the first bus of described interlocking-type switch connection, described high reliability power supply buses and described the second bus disconnect; When described the second bus of described interlocking-type switch connection, described high reliability power supply buses and described the first bus disconnect; During normal operation, described high reliability power supply buses is connected with one of described second bus with described the first bus, when detecting bus loss of pressure, the interlocking-type switch cuts off on the bus that is switched to decompression not with being connected of decompression bus, the normal power supply of the described important load that assurance is connected with described high reliability power supply buses.
Be connected with other loads on described the first bus and described the second bus.
Described other loads comprise ice-reserving air conditioning equipment.
The alternating current-direct current mixing micro-grid system that the embodiment of the invention provides, upgrade on the basis that guarantees existing electric power-feeding structure, structure is further strengthened, dissimilar workload demands and different brackets electrical load requirement in the power supply area have been considered, the power supply reliability of all loads in the system can be improved, the uninterrupted high reliability power supply of important load in the microgrid can be realized simultaneously.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structured flowchart of an embodiment of a kind of alternating current-direct current mixing micro-grid system provided by the invention;
Fig. 2 is the structure chart of an embodiment of a kind of alternating current-direct current mixing micro-grid system provided by the invention;
Fig. 3 is the important load power supply design structure diagram of an embodiment of a kind of alternating current-direct current mixing micro-grid system provided by the invention.
Embodiment
Below with reference to accompanying drawing the preferred embodiments of the present invention are described.
Embodiment one
Fig. 1 is the structured flowchart of an embodiment of a kind of alternating current-direct current mixing micro-grid system provided by the invention.As shown in Figure 1, present embodiment has been constructed a kind of alternating current-direct current mixing micro-grid system, comprises following structure:
D101, light storage one power supply unit.Light storage one power supply unit comprises DC power-supply system, AC/DC converting means, the first AC load and exchanges the microgrid bus.DC power-supply system is by AC/DC converting means incoming transport microgrid bus, and the first AC load is connected to and exchanges on the microgrid bus, is powered by DC power-supply system.DC power-supply system comprises photovoltaic devices, energy storage device, dc load and dc bus, and photovoltaic devices and energy storage device are by DC/DC converting means access dc bus, and dc load is connected with dc bus, by photovoltaic devices and energy storage device power supply.
D102, three alliance power supply units.Three alliance power supply units comprise three alliance generating sets, the second AC load and three alliance ac bus, and three alliance generating sets link to each other with the second AC load by three alliance ac bus, power to the second AC load.
D103, high reliability power supply unit.The high reliability power supply unit comprises high reliability power supply buses and important load, is connected with three alliance power supply units with light storage one power supply unit, and light storage one power supply unit and three alliance power supply units form the duplicate supply of high reliability power supply unit.
By above structure, formed alternating current-direct current mixing micro-grid system.
Embodiment two
Fig. 2 is the structure chart of an embodiment of a kind of alternating current-direct current mixing micro-grid system provided by the invention.Present embodiment has been constructed alternating current-direct current mixing micro-grid system provided by the invention in detail.
Take the 400V bus as the basis, with each generator unit and power unit by certain compound mode formation alternating current-direct current mixing micro-grid system as shown in Figure 2.Wherein, the C zone is the structure of whole micro-grid system, comprises a-quadrant three alliance power supply units and B area light storage one power supply unit, and load 5 is that three stage loads are by bus 4 power supplies; Load 1, load 2 are that two stage loads are by bus 6 and bus 7 power supplies; Load 3, load 4 are a stage load, and load 3 is dc load, and by DC bus powered, load 4 is by bus 8 power supplies; Ice storage air conditioner is outer other loads of microgrid.Microgrid zone A, B, C, D all can work independently.
Native system can split into different supply modules, the whole system C-structure is made of light storage one power supply unit B, three alliance power supply unit A, wherein module B is when the current transformer fault, by cut-offfing corresponding switch, can form DC power-supply system D module, each module has the basic condition of each self-operating.
Module B is light storage one power supply unit, formed by photovoltaic devices PV, energy storage device Bat and dc load 3, but independent operating.Wherein photovoltaic devices PV, energy storage device Bat are by DC/DC converting means access dc bus, and direct current system is incorporated interchange microgrid bus 7 into by the DC/AC converting means.Energy storage device Bat, photovoltaic devices PV both can power for dc load, also can power for AC load.Light storage one power supply unit links to each other with bus 5 by the switch P CC2 that is incorporated into the power networks.
Modules A is three alliance power supply units, and three alliance generating sets and AC load 1 are connected on the bus 6 by switch, and bus 6 is connected on the bus 4 by the switch P CC1 that is incorporated into the power networks.During lonely network operation, the switch P that is incorporated into the power networks CC1 disconnects, and is powered to load by three alliance generating sets; When being incorporated into the power networks, the switch P that is incorporated into the power networks CC1 conducting, electric energy exchanges by bus 4 and bus 6.
Native system adopts the power supply entering line form.Link to each other by bus connection switch 6 between bus 4 and the bus 5, play the prepared auto restart effect.During normal operation, switch 6 disconnects.When civil power one breaks down, prepared auto restart switch auto-closing, the load on the bus 4 turns confession by circuit 2, and after fault recovery, switch 6 does not allow automatic recovery, needs manually to recover original state; When civil power two breaks down, prepared auto restart switch auto-closing, load turns confession by circuit 1 on the bus 5, and after fault recovery, switch 6 does not allow automatic recovery, needs manually to recover original state.
Normal mode is analyzed
During normal operation, switch 5,7,8,10,11,12-18 and be incorporated into the power networks switch P CC1, PCC2, closure, switch 6,9 disconnects.System is incorporated into the power networks, and is equivalent to microgrid bus of whole distributed power sources and AC load access.At this moment, three alliance generating sets and energy storage device Bat operate in permanent power mode, when light storage one power supply unit is powered to dc load, also to the AC load power supply that comprises load on ice storage air conditioner and other buses.
Failure mode analysis (FMA)
A. higher level's line fault
When circuit 1 breaks down, bus 4 dead electricity, the contactor of three alliance generating set inside disconnects simultaneously, and it is excessively low that its internal protection detects set end voltage, the execute protection action, three alliance generating sets enter hot standby state.Bus 4 was hung to load and was in passive states this moment, and prepared auto restart switch 6 closures are with bus 4 and bus 5 UNICOMs, provide electric power by bus 5 to the load of bus 4, wherein, only in the situation that three alliance generating set internal interface tentaculums are opened, just allow prepared auto restart switch 6 closures.
When circuit 2 breaks down, bus 5 dead electricity, bus 5 was hung load and was in passive states this moment, and prepared auto restart switch 6 closures with bus 5 and bus 4 UNICOMs, provide electric power by bus 4 to the load of bus 5.
B. busbar fault
During networking operation, if bus 4 faults, switch 5 execute protections actions, this moment bus 4 decompressions, three alliance generating sets detect bus 4 faults, switch to from the net pattern free band load operation according to logic of propositions.Do not allow switch 6 closures this moment.
If bus 5 faults, switch 7 execute protections actions, this moment bus 5 decompressions, light storage one power supply unit detects bus 4 faults, switches to from the net pattern free band load operation according to logic of propositions.Do not allow switch 6 closures this moment.
When various malfunctions occur, the assurance of all can powering of micro-grid system internal loading 3 and important load load 4.
Embodiment three
Fig. 3 is the important load power supply design structure diagram of an embodiment of a kind of alternating current-direct current mixing micro-grid system provided by the invention.As shown in Figure 3, present embodiment has been realized the power supply of important load in the microgrid.
For improving the system power supply reliability, sub-load can be treated as important load, it is adopted Dual-power automatic switching power supply design, in the present embodiment, load 4 is important load.As shown in Figure 3, switch 9, switch 10 are the service entrance switch of load 4, and two switches adopt the mechanical chain design, and its action logic is: when supposing normal the operation, setting bus 5 is main power supply, and switch 9 is opened, switch 10 closures; When bus 5 power failure, detect bus loss of pressure, switch 9 closures then, Simultaneous Switching 10 is opened, and all loads are by bus 4 power supplies.If again detect bus 5 pressure is arranged, switch 10 closures then, chain tripping switch 9 recovers by bus 5 power supplies simultaneously.
Same, if bus 4 is main power supply, when then normally moving, switch 10 is opened, switch 9 closures; When bus 4 power failure, detect bus loss of pressure, switch 10 closures then, Simultaneous Switching 9 is opened, and all loads are by bus 5 power supplies.If again detect bus 4 pressure is arranged, switch 9 closures then, chain tripping switch 10 recovers by bus 4 power supplies simultaneously.
The important load power supply project organization of present embodiment has guaranteed the electric power supply of important load in normal power supply busbar fault situation.
The alternating current-direct current mixing micro-grid system that the embodiment of the invention provides, upgrade on the basis that guarantees existing electric power-feeding structure, structure is further strengthened, dissimilar workload demands and different brackets electrical load requirement in the power supply area have been considered, the power supply reliability of all loads in the system can be improved, the uninterrupted high reliability power supply of important load in the microgrid can be realized simultaneously.
Above disclosed is preferred embodiment of the present invention only, certainly can not limit with this interest field of the present invention, and the equivalent variations of therefore doing according to claim of the present invention still belongs to the scope that the present invention is contained.
Claims (8)
1. alternating current-direct current mixing micro-grid system, it is characterized in that, comprise: light stores up one power supply unit, three alliance power supply units and possesses the high reliability power supply unit of chain function, wherein, described light storage one power supply unit and three alliance power supply units form the duplicate supply of described high reliability power supply unit.
2. a kind of alternating current-direct current mixing micro-grid system according to claim 1, it is characterized in that, described light storage one power supply unit further comprises DC power-supply system, AC/DC converting means, the first AC load and exchanges the microgrid bus, described DC power-supply system accesses described interchange microgrid bus by described AC/DC converting means, described the first AC load is connected on the described interchange microgrid bus, by described DC power-supply system power supply.
3. a kind of alternating current-direct current mixing micro-grid system according to claim 2, it is characterized in that, described DC power-supply system further comprises photovoltaic devices, energy storage device, dc load and dc bus, described photovoltaic devices and energy storage device access described dc bus by the DC/DC converting means, described dc load is connected with described dc bus, by described photovoltaic devices and energy storage device power supply.
4. a kind of alternating current-direct current mixing micro-grid system according to claim 3, it is characterized in that, described three alliance power supply units further comprise three alliance generating sets, the second AC load and three alliance ac bus, described three alliance generating sets link to each other with described the second AC load by described three alliance ac bus, to described the second AC load power supply.
5. a kind of alternating current-direct current mixing micro-grid system according to claim 4, it is characterized in that, described three alliance ac bus are connected to the first bus by first switch that is incorporated into the power networks, described interchange microgrid bus is connected to the second bus by second switch that is incorporated into the power networks, described the first bus links to each other by bus connection switch with described the second bus, described the first bus is as the prepared auto restart equipment of described the second bus, and described the second bus is as the prepared auto restart equipment of described the first bus.
6. a kind of alternating current-direct current mixing micro-grid system according to claim 5, it is characterized in that, described high reliability power supply unit further comprises high reliability power supply buses and important load, described important load is connected on the described high reliability power supply buses, described high reliability power supply buses is connected respectively to described the first bus and described the second bus by the interlocking-type switch, when described the first bus of described interlocking-type switch connection, described high reliability power supply buses and described the second bus disconnect; When described the second bus of described interlocking-type switch connection, described high reliability power supply buses and described the first bus disconnect; During normal operation, described high reliability power supply buses is connected with one of described second bus with described the first bus, when detecting bus loss of pressure, the interlocking-type switch cuts off on the bus that is switched to decompression not with being connected of decompression bus, the normal power supply of the described important load that assurance is connected with described high reliability power supply buses.
7. a kind of alternating current-direct current mixing micro-grid system according to claim 6 is characterized in that, is connected with other loads on described the first bus and described the second bus.
8. a kind of alternating current-direct current mixing micro-grid system according to claim 7 is characterized in that described other loads comprise ice-reserving air conditioning equipment.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210511794.9A CN103001254B (en) | 2012-12-04 | 2012-12-04 | Alternating current and direct current hybrid micro-grid system |
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| CN201210511794.9A CN103001254B (en) | 2012-12-04 | 2012-12-04 | Alternating current and direct current hybrid micro-grid system |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103337876A (en) * | 2013-06-26 | 2013-10-02 | 贵州电力试验研究院 | Grid connection and separation control structure and operation method of photovoltaic power generation system |
| CN104065064A (en) * | 2014-07-14 | 2014-09-24 | 国网上海市电力公司 | Control method for a 110 kilovolt transformer substation micro-grid |
| CN104269880A (en) * | 2014-09-12 | 2015-01-07 | 国网上海市电力公司 | Unit photovoltaic and triple co-generation grid-connection electricity generation system |
| CN105281352A (en) * | 2014-06-06 | 2016-01-27 | �林昌明 | Photovoltaic power-energy storage integrated off-grid system and multistage optimization control method thereof |
| CN107039965A (en) * | 2017-05-16 | 2017-08-11 | 南京南瑞继保电气有限公司 | A kind of community's supplying power allocation system |
| CN108288860A (en) * | 2018-01-19 | 2018-07-17 | 山东联星能源集团有限公司 | A kind of novel energy-storing power station |
| CN108599132A (en) * | 2018-05-24 | 2018-09-28 | 安徽工业大学 | The method and system of direct-current micro-grid segmentation droop control under the conditions of improvement continuous duty |
| CN112054516A (en) * | 2020-09-04 | 2020-12-08 | 广东电网有限责任公司广州供电局 | Hierarchical power supply framework, method and equipment for industrial park with distributed power supply |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103337876A (en) * | 2013-06-26 | 2013-10-02 | 贵州电力试验研究院 | Grid connection and separation control structure and operation method of photovoltaic power generation system |
| CN103337876B (en) * | 2013-06-26 | 2016-05-25 | 贵州电力试验研究院 | A kind of photovoltaic generating system also, from net control structure and method of operating |
| CN105281352A (en) * | 2014-06-06 | 2016-01-27 | �林昌明 | Photovoltaic power-energy storage integrated off-grid system and multistage optimization control method thereof |
| CN104065064A (en) * | 2014-07-14 | 2014-09-24 | 国网上海市电力公司 | Control method for a 110 kilovolt transformer substation micro-grid |
| CN104269880A (en) * | 2014-09-12 | 2015-01-07 | 国网上海市电力公司 | Unit photovoltaic and triple co-generation grid-connection electricity generation system |
| CN107039965A (en) * | 2017-05-16 | 2017-08-11 | 南京南瑞继保电气有限公司 | A kind of community's supplying power allocation system |
| CN107039965B (en) * | 2017-05-16 | 2023-11-24 | 南京南瑞继保电气有限公司 | Community distribution network power supply system |
| CN108288860A (en) * | 2018-01-19 | 2018-07-17 | 山东联星能源集团有限公司 | A kind of novel energy-storing power station |
| CN108599132A (en) * | 2018-05-24 | 2018-09-28 | 安徽工业大学 | The method and system of direct-current micro-grid segmentation droop control under the conditions of improvement continuous duty |
| CN108599132B (en) * | 2018-05-24 | 2020-03-24 | 安徽工业大学 | Method and system for improving direct-current micro-grid sectional droop control under continuous load condition |
| CN112054516A (en) * | 2020-09-04 | 2020-12-08 | 广东电网有限责任公司广州供电局 | Hierarchical power supply framework, method and equipment for industrial park with distributed power supply |
| CN112054516B (en) * | 2020-09-04 | 2022-06-21 | 广东电网有限责任公司广州供电局 | Hierarchical power supply framework, method and equipment for industrial park with distributed power supply |
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| CN103001254B (en) | 2014-12-10 |
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