CN105207269A - Microgrid-connected system in rural grid - Google Patents
Microgrid-connected system in rural grid Download PDFInfo
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- CN105207269A CN105207269A CN201510747928.0A CN201510747928A CN105207269A CN 105207269 A CN105207269 A CN 105207269A CN 201510747928 A CN201510747928 A CN 201510747928A CN 105207269 A CN105207269 A CN 105207269A
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Abstract
The invention provides a microgrid-connected system in a rural grid. The microgrid-connected system is characterized in that: power supplies of a wind light storage system connected in an alternating current bus line, a biomass unit or a diesel generation system are connected in the same feeder line, and the feeder line supplies power to an alternating current load connected in the same feeder line through a transformer; or, the wind light storage system alternately connected in an alternating current bus line supplies power to a direct current load connected in the same direct current bus line, and is connected with the transformer through an inverter to be connected in the same feeder line where the biomass unit or the diesel generation system exists; other alternating current loads are connected in corresponding feeder lines; the feeder lines are connected in medium-voltage bus lines, and are further connected with another transformer through points of common coupling to be connected with an outer grid; or, the alternating current bus line where the wind light storage system exists is connected in a feeder line, and another feeder line where the biomass unit exists supplies power to loads connected in the another feeder line through another alternating current bus line. According to the invention, grid connection is adopted as the purpose, the supplied loads are boundary conditions, a basic scheme applicable to the microgrid-connected system of the rural grid is provided, and relatively good engineering practicality is achieved.
Description
Technical field
The present invention relates to for electrical domain, the micro-grid connection system particularly in a kind of rural power grids.
Background technology
The energy resource structure of China and part throttle characteristics determine western part, northern conduct generates electricity base, and east, middle part is as the electric power industry development characteristic of load center.Thus, logical long-distance, the transmission of electricity form that jumbo passway for transmitting electricity connects generating base and load center becomes China and mainly to transmit electricity form.But accident easily spreads when this form has an accident, and larger pressure is caused for the peaking problem of load center.And transmit electricity at a distance on a large scale, peak regulation is more difficult, therefore, can consider to solve from the angle of dsm.And flexible distributed power supply can become long distance, the important supplement of Large Copacity powering mode.But generally use the distributed power generation of new forms of energy serious by natural cause restriction, this factor directly results in the micro-capacitance sensor concept that distributed power source, power load, energy storage device and control device etc. are combined into.
In Practical Project, form the difference of power supply according to micro-capacitance sensor, the difference of micro-capacitance sensor typical structure classification, micro-capacitance sensor building site, build the difference of object, the synchronizing mode of last micro-capacitance sensor is also not quite similar.Micro-capacitance sensor typical case power supply is mainly divided into the polytypes such as the generating of single power supply, wind-solar-storage joint, miniature gas turbine and alliance class power supply, biomass energy micro-capacitance sensor.Micro-capacitance sensor typical structure has interchange micro-capacitance sensor, direct-current grid, alternating current-direct current micro-capacitance sensor
Wherein, for the certain areas that renewable energy source category is comparatively single, mainly taking to be applicable to local regenerative resource as micro-capacitance sensor fundamental power supply, simultaneously for meeting different construction objects, configuring different energy storage and other auxiliary new forms of energy power supplys.In general, single power supply class area is main based on wind-powered electricity generation and photovoltaic.Micro-capacitance sensor based on wind-powered electricity generation, is mainly used in China western part, northern grade for wind resource is a class or two classes, but comparatively remote area, be mainly used in locality supply electric power, as the important supplement of bulk power grid.In addition, the micro-capacitance sensor of southeastern coast province based on wind-powered electricity generation, capacity is less, and is often furnished with photovoltaic, and other energy such as energy storage, mainly based on scientific research, generally adopt grid type, need bulk power grid to support.
From net type photovoltaic micro in order to solve the problem of evening without sunlight, meet the electricity needs in evening mainly through configuration energy storage device.Be limited to cost, from net type photovoltaic micro supply load often less, and less demanding to power supply reliability.Parallel networking type photovoltaic micro-capacitance sensor does not generally configure or configures energy storage on a small quantity, and configuration purpose is mainly and improves the quality of power supply.Building site is then the city that electrical network is stronger, and often combines with building, avoids taking up an area too much, such as installs grid-connected photovoltaic power generation system at communal facility, commercial building and For The Factory Roof etc.
Wind-solar-storage joint micro-capacitance sensor of powering refers to photovoltaic generation and blower fan generating for the micro-capacitance sensor of major function form, in conjunction with the feature of wind-powered electricity generation and photovoltaic generation, can be formed and have complementary advantages.Such as, often daytime, generating was few for wind power generation, and night, generating was many, and photovoltaic antithesis.Scene combines the fluctuation that can reduce micro-capacitance sensor power supply to a certain extent.For embodying wind light mutual complementing in scope widely, ensureing that the quality of power supply of micro-capacitance sensor meets other requirements simultaneously, needing to configure a certain amount of energy storage device.But wind-light storage micro-capacitance sensor is owing to being configured with a certain amount of energy storage device, cost is often higher, and in order at utmost weaken the exploitation pressure of high cost, this kind of micro-capacitance sensor is often relatively better in honourable resource, electricity market is comparatively ripe, and economically developed area is developed as pilot.The factor of cost limits the potentiality to be exploited of wind-light storage micro-capacitance sensor in general area.
During the actual construction of micro-capacitance sensor, except the ranges of application such as wind-light storage are comparatively wide, outside the power supply that relative cost is lower, also there is other types power supply.Current China all develops industrial park, high-tech park in many cities, and often there is comparatively stable cooling and heating load demand this kind of garden.It is lower that gas turbine possesses unit power expense, environmental friendliness, energy utilization rate high, and therefore, gas turbine becomes the core force providing garden supply of cooling, heating and electrical powers.By the generating of Thorough combustion natural gas pushing turbine, directly utilize waste gas heat supply or freezed by lithium bromide chiller, to meet cooling and heating load demand, improving energy utilization rate.But the principal element of restriction gas turbine is implementing of source of the gas.China's natural gas reserve distribution is uneven, and West-East National Gas Transmission Project is limited for big and medium-sized cities, east natural gas supply, and price is often more expensive.Therefore combustion engine system utilizes occasion less at present, is only limitted to the big city that natural gas supply is comparatively sufficient, and is generally grid type electrical network, is only used for supplying cooling and heating load.
Biomass energy is divided into multiple, comprises wood chips, stalk, biogas, house refuse etc.China natural resources is enriched, and different areas is also applicable to different biomass energies.Such as, the northeast region that forestry is comparatively flourishing, can utilize and fell residue chip as biomass power generation raw material.The province that central and east agricultural is comparatively flourishing, be applicable to stalk, grain processing residue etc. are as the raw material of biomass power generation.And vast rural area, be suitable for developing animal waste biogas power generation etc., and adopt the biomass energy such as house refuse and agricultural crop straw simultaneously, based on these energy supplying systems, develop micro-capacitance sensor.
Exchange the current still micro-capacitance sensor main flow of micro-capacitance sensor, be basic grid structure with ripe AC network, carry out load and micro-capacitance sensor power distribution in load side, become the blank exchanging micro-capacitance sensor.
More for distributed power source, the situation that load is less, can select direct-current grid.Adopt direct-current grid, can reduce in a large number and exchange a large amount of current transformer used in micro-capacitance sensor, the electric power in distributed power source is directly dissolved by DC load, and structure is more simple, and loss is less, and efficiency is higher.
Mixed type alternating current-direct current micro-capacitance sensor is associated with family AC network by AC system, is got in touch with by inverter and direct-current grid.This micro-capacitance sensor flexible structure, is applicable to each type load.But this micro-capacitance sensor structure relative complex, relative construction cost is higher.
Visible, micro-capacitance sensor flexible structure, widely applicable, only can not propose micro-grid connection mode for a certain electrical network, load condition, according to boundary conditions such as periphery electrical network, load type or workload demands, the micro-grid connection scheme of various boundary should be considered.Therefore, how fast and effeciently to select suitable micro-grid connection mode, to the construction efficiency important in inhibiting improving micro-capacitance sensor Practical Project.
Summary of the invention
The invention provides the micro-grid connection system in a kind of rural power grids, is the situation of external electrical network for rural power grids, according to different grid-connected targets and supply load, propose adapt micro-capacitance sensor typical case connect-in strategy.
In order to achieve the above object, a technical scheme of the present invention is to provide the micro-grid connection system in a kind of rural power grids, and wherein, any one or its combination in any in photovoltaic plant, blower fan, energy type energy-storage system, accesses an ac bus; The power supply of described ac bus, sends out the power supply of system with biomass unit or bavin, is linked into same feeder line respectively, for the first AC load being linked into same feeder line by transformer is powered; Some second AC load access other respective feed connection respectively; Press bus during each feeder line accesses respectively, and then connect another transformer to be incorporated to external electrical network by points of common connection.
Preferably, replace the wind-light storage system of access one ac bus, for accessing any one or its combination in any in the photovoltaic plant of a DC bus, blower fan, power-type energy-storage system, and be the DC load being linked into same DC bus and power; The power supply of described DC bus by inverter connection transformer to be linked into the same feeder line sending out system place with biomass unit or bavin.
Preferably, the resident of described micro-grid connection Operation system setting in rural area or the roof of utilities building.
Preferably, the power supply reliability of described first AC load requires higher than the second AC load.
Preferably, the power supply reliability of described DC load requires the second AC load.
Another technical scheme of the present invention is to provide the micro-grid connection system in a kind of rural power grids, wherein, any one or its combination in any in photovoltaic plant, blower fan, energy type energy-storage system, access an ac bus, the power supply of described ac bus accesses a feeder line; The power supply of biomass unit accesses another feeder line, for the some loads being linked into this another feeder line by another ac bus are powered; Bus is pressed during each feeder line connects respectively, and then by points of common connection connection transformer to be incorporated to external electrical network.
Preferably, system sent out by the bavin that described micro-grid connection system is also provided with AC system grid-connected.
Preferably, described micro-grid connection Operation system setting is in the vacant soil of rural area periphery or the unserviceable region of agricultural production.
In sum, the present invention unifies on the basis of Typical model project in the domestic and international micro-capacitance sensor laboratory system of abundant investigation, in conjunction with the energy resource structure of micro-capacitance sensor self-characteristic and China, with micro-capacitance sensor typical electrical source module, study and propose the typical structure of the distributed wind-light storage system based on micro-capacitance sensor, comprising position of network topology, the electrical wiring network configuration of micro-capacitance sensor inside, power supply system (AC/DC is powered and three-phase/single phase power supply), corresponding load and distributed power source place micro-capacitance sensor etc.The present invention with grid-connected target, supply load to be boundary condition, propose the micro-grid connection system-based scheme being adapted to rural power grids, possess good engineering practicability.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the micro-grid connection system in rural power grids of the present invention in scheme 2A first embodiment;
Fig. 2 is the schematic diagram in scheme 2A second embodiment in the present invention;
Fig. 3 is the schematic diagram at scheme 2B in the present invention.
Embodiment
In the present invention based on the difference of extraneous electrical network constraints, with grid-connected target, supply load to be boundary condition, the grid-connected base case of micro-capacitance sensor typical case being adapted to various boundary is proposed, during Practical Project, according to the different demand in owner aspect, all kinds of base case can be combined.
The present invention relates to the micro-grid connection target of rural area, have following several types:
1, power supply reliability is improved.Rural power grids area power grid structural weak, all types of user is positioned at electrical network end, and the quality of power supply, reliability are poor.In this case, micro-capacitance sensor is utilized to strengthen the subscriber's side powered reliability of rural power grids and the quality of power supply, can as effectively supplementing utility network.
2, Rural Natural Resources is utilized, development distributed power source.Rural area renewable resource is more, comprises wind-force, photovoltaic, waterpower, biomass, and system sent out by bavin, miniature gas turbine, diesel engine, Hydrogen Energy etc.Each rural electricity consumption load is limited to the difference of geographical environment, micro-capacitance sensor power supply is selected each different, considers in principle to utilize Rural Natural Resources to greatest extent, and the position of distributed power source generally needs near load, the electric energy on-site elimination produced, supplements as the strong of electrical network end.
Rural area load comprises all kinds of agricultural, industry, common equipment and residential electricity consumption equipment.In general, rural area load is the combination of agricultural, industry or three type loads such as villager's inhabitations/communal facility, combination carrier compound reveal seasonality comparatively by force, lower, the multiple feature such as load density is less and power factor is low of year maximum hourage.
Under rural power grids mode, micro-capacitance sensor construction object is mainly the regenerative resource improving power supply reliability, at utmost utilize rural area abundant.Building site is then main in places such as premises vacant lot, roofs.Comprehensive above-mentioned all kinds of micro-grid connection target and building site, induction and conclusion goes out grid-connected typical scenario under following a few class rural power grids mode:
scheme 2A:
The building site of this programme is the roof of urban residents or utilities building, and grid-connected main target is for utilize regional circumferential distribution formula power supply to greatest extent.System sent out by micro-capacitance sensor power acquisition wind-light storage system, low capacity biomass power supply or bavin, and capacity considers multi-user's level or single user level, according to configuration capacity size, adopts interchange or direct current system to be incorporated to the original network system in house.
The AC system connect-in strategy of this programme as shown in Figure 1, requires general load to power supply reliability, accesses feeder line A, B respectively; The same bus of the access such as photovoltaic plant, blower fan, energy type energy-storage system, and be linked into feeder line C, for the important load (power supply reliability requires high) being linked into this feeder line C by corresponding transformer is respectively powered; This feeder line C can also have access to biomass unit or system sent out by bavin.Bus is pressed during each feeder line connects respectively, and then by points of common connection (PCC) connection transformer to be incorporated to external electrical network.
The direct current system connect-in strategy of this programme as shown in Figure 2, be that photovoltaic plant, blower fan, power-type energy-storage system etc. are powered for being linked into the important load being in same DC bus with it with the difference of AC system, the power supply of this DC bus by inverter connection transformer to be linked into feeder line C.System of sending out biomass unit or bavin directly accesses this feeder line C.
scheme 2B:
The building site of this programme is that the normal agricultural such as the vacant soil of rural area periphery or Coastal beach produces unserviceable region, and grid-connected main target adds urban distribution network end structure for utilizing micro-capacitance sensor.Micro-capacitance sensor power acquisition biomass power supply, wind-light storage system, the general AC system that adopts is incorporated to the original network system in this area.
As shown in Figure 3, make the bus having access to each load be linked into a feeder line, biomass plant-grid connection is to same feeder line for the AC system connect-in strategy of this programme; Have access to a bus of any one or its combination in any in photovoltaic plant, blower fan, energy type energy storage device, be linked into another feeder line.Bus is pressed during each feeder line connects respectively, and then by points of common connection connection transformer to be incorporated to external electrical network.
In sum, can utilize distributed resource to greatest extent in scheme 2A, applicable workload demand is the load such as ordinarily resident, business, and power supply is selected based on wind-light storage system, biomass power supply, add during conditions permit and join Chai Fa etc., grid-connected by AC system, direct current system mode.Micro-capacitance sensor can be utilized in scheme 2B to add urban distribution network end structure, be applicable to the load such as ordinarily resident, business, power supply is selected based on wind-light storage system, biomass power supply, add during conditions permit and join Chai Fa etc., grid-connected by AC system mode, capacity is comparatively large, effectively utilizes biomass power supply etc. to strengthen end electrical network.If scheme 2B is applied to urban distribution network, is then adjusted to and uses single power supply or wind-light storage, fuel cell etc. to be main power source.
Although content of the present invention has done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to limitation of the present invention.After those skilled in the art have read foregoing, for multiple amendment of the present invention and substitute will be all apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (8)
1. the micro-grid connection system in rural power grids, is characterized in that,
Any one or its combination in any in photovoltaic plant, blower fan, energy type energy-storage system, accesses an ac bus; The power supply of described ac bus, sends out the power supply of system with biomass unit or bavin, is linked into same feeder line respectively, for the first AC load being linked into same feeder line by transformer is powered;
Some second AC load access other respective feed connection respectively; Press bus during each feeder line accesses respectively, and then connect another transformer to be incorporated to external electrical network by points of common connection.
2. the micro-grid connection system in rural power grids as claimed in claim 1, is characterized in that,
Replace the wind-light storage system of access one ac bus, for accessing any one or its combination in any in the photovoltaic plant of a DC bus, blower fan, power-type energy-storage system, and be the DC load being linked into same DC bus and power; The power supply of described DC bus by inverter connection transformer to be linked into the same feeder line sending out system place with biomass unit or bavin.
3. the micro-grid connection system in rural power grids as claimed in claim 1 or 2, is characterized in that,
The resident of described micro-grid connection Operation system setting in rural area or the roof of utilities building.
4. the micro-grid connection system in rural power grids as claimed in claim 1, is characterized in that,
The power supply reliability of described first AC load requires higher than the second AC load.
5. the micro-grid connection system in rural power grids as claimed in claim 2, is characterized in that,
The power supply reliability of described DC load requires the second AC load.
6. the micro-grid connection system in rural power grids, is characterized in that,
Any one or its combination in any in photovoltaic plant, blower fan, energy type energy-storage system, access an ac bus, the power supply of described ac bus accesses a feeder line;
The power supply of biomass unit accesses another feeder line, for the some loads being linked into this another feeder line by another ac bus are powered;
Bus is pressed during each feeder line connects respectively, and then by points of common connection connection transformer to be incorporated to external electrical network.
7. the micro-grid connection system in rural power grids as claimed in claim 6, is characterized in that,
System sent out by the bavin that described micro-grid connection system is also provided with AC system grid-connected.
8. the micro-grid connection system in rural power grids as claimed in claims 6 or 7, is characterized in that,
Described micro-grid connection Operation system setting is in the vacant soil of rural area periphery or the unserviceable region of agricultural production.
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| CN201510747928.0A CN105207269A (en) | 2015-11-06 | 2015-11-06 | Microgrid-connected system in rural grid |
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Cited By (6)
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| CN107404123A (en) * | 2017-08-02 | 2017-11-28 | 四川大通睿恒能源有限公司 | AC and DC distributed energy is mixed into system |
| CN108037715A (en) * | 2017-10-25 | 2018-05-15 | 国网信通亿力科技有限责任公司 | One kind can time shift agricultural load acquisition method |
| CN110518609A (en) * | 2019-08-07 | 2019-11-29 | 上海电力大学 | Protect the mobile energy storage method of rural power grids safety |
| CN110729812A (en) * | 2019-10-23 | 2020-01-24 | 哈尔滨理工大学 | Small-sized guaranteed power supply system for village |
| CN113472011A (en) * | 2021-07-05 | 2021-10-01 | 广西大学 | Wind-solar storage micro-grid operation method and system meeting fruit tree irrigation requirements |
| CN116231872A (en) * | 2023-05-04 | 2023-06-06 | 国网湖北省电力有限公司经济技术研究院 | Intelligent energy gateway for rural users and energy regulation and control method |
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| US20140249686A1 (en) * | 2013-03-01 | 2014-09-04 | Honeywell International, Inc. Patent Services M/S AB/2B | System and method of large area microgrid stability controls |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107404123A (en) * | 2017-08-02 | 2017-11-28 | 四川大通睿恒能源有限公司 | AC and DC distributed energy is mixed into system |
| CN108037715A (en) * | 2017-10-25 | 2018-05-15 | 国网信通亿力科技有限责任公司 | One kind can time shift agricultural load acquisition method |
| CN110518609A (en) * | 2019-08-07 | 2019-11-29 | 上海电力大学 | Protect the mobile energy storage method of rural power grids safety |
| CN110729812A (en) * | 2019-10-23 | 2020-01-24 | 哈尔滨理工大学 | Small-sized guaranteed power supply system for village |
| CN113472011A (en) * | 2021-07-05 | 2021-10-01 | 广西大学 | Wind-solar storage micro-grid operation method and system meeting fruit tree irrigation requirements |
| CN116231872A (en) * | 2023-05-04 | 2023-06-06 | 国网湖北省电力有限公司经济技术研究院 | Intelligent energy gateway for rural users and energy regulation and control method |
| CN116231872B (en) * | 2023-05-04 | 2023-07-14 | 国网湖北省电力有限公司经济技术研究院 | Intelligent energy gateway for rural users and energy regulation and control method |
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Application publication date: 20151230 |