CN105226717A - Micro-grid connection system in urban distribution network - Google Patents
Micro-grid connection system in urban distribution network Download PDFInfo
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Abstract
The invention provides the micro-grid connection system in a kind of urban distribution network, wherein to provide the bavin of stable output power to send out system or gas turbine, for the AC load being linked into same feeder line is powered, and using wind-light storage system as auxiliary power supply source; With containing the synchronous unit cold and heat supply of alliance type of gas turbine, and power for the AC load of same feeder line; Power supply is that the DC load accessing same DC bus is powered in a distributed manner, by after inverter for the AC load of the same ac bus of access is powered, and then realize grid-connected by being linked into one of them feeder line after another transformer.The present invention with grid-connected target, supply load to be boundary condition, propose the micro-grid connection system-based scheme being adapted to urban distribution network, possess good engineering practicability.
Description
Technical field
The present invention relates to for electrical domain, the micro-grid connection system particularly in a kind of urban distribution network.
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 urban distribution network, is the situation of external electrical network for urban distribution network, 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 urban distribution network, wherein to comprise with middle pressure bus through points of common connection connection transformer to access any one micro-capacitance sensor following or its combination in any of external electrical network:
System or gas turbine is sent out to provide the bavin of stable output power, for with described bavin send out system or gas turbine be linked into middle pressure bus after the AC load of wherein same feeder line power, and wind-light storage system access is to the auxiliary power supply source of this feeder line as described AC load;
To be responsible for carrying out cold and heat supply to cooling and heating load containing the synchronous unit of alliance type of gas turbine, and power for the AC load of the wherein same feeder line after being linked into middle pressure bus with the synchronous unit of this alliance type;
Power supply is that the DC load accessing same DC bus with described distributed power source is powered in a distributed manner; Power supply on described DC bus is that the AC load accessing same ac bus is powered by accessing an ac bus after inverter; The power supply of described ac bus is by being linked into one of them feeder line after middle pressure bus after another transformer.
Preferably, sending out system or gas turbine with bavin is the micro-capacitance sensor that the AC load of same feeder line is powered, and be arranged on industrial park, this micro-capacitance sensor adopts AC system to be incorporated to original network system.
Preferably, with same feeder line apoplexy light-preserved system and the AC load that provides the bavin of stable output power to send out system or gas turbine to power, its power supply reliability requires the power supply reliability requirement higher than other loads being linked into another feeder line.
Preferably, send out in the micro-capacitance sensor of system or gas turbine containing the bavin stablizing output power, be provided with the grid-connected gas turbine of AC system or biomass unit; Or, in this micro-capacitance sensor, replace described bavin with wind-light storage system and send out system for described AC load and power.
Preferably, to be responsible for cold and heat supply containing the synchronous unit of alliance type of gas turbine and to take into account the micro-capacitance sensor that the AC load for same feeder line powers, industrial park or high-tech park is arranged on; This micro-capacitance sensor adopts AC system when being incorporated to original network system, and any one or its combination in any in the photovoltaic plant at another feeder line place after middle pressure bus, blower fan, energy type energy storage device is that the AC load being linked into this another feeder line carries out auxiliary power supply; Another feeder line place after middle pressure bus has access to can power-off load.
Preferably, to be responsible for cold and heat supply containing the synchronous unit of alliance type of gas turbine and to take into account the micro-capacitance sensor that the AC load for same feeder line powers, industrial park or high-tech park is arranged on; This micro-capacitance sensor adopts ac and dc systems when being incorporated to original network system, and any one or its combination in any in photovoltaic plant, blower fan, power-type energy storage device, for the DC load being linked into the same DC bus with its place carries out auxiliary power supply;
The power supply of DC bus by being linked into another feeder line after middle pressure bus after inverter connection transformer, and can be powered by power-off load for some being linked into this another feeder line; Another feeder line place after middle pressure bus has access to other can power-off load.
Preferably, the access of another feeder line place after middle pressure bus can power-off load, its power supply reliability requires lower than the AC load at other feeder line places or the power supply reliability requirement of DC load.
Preferably, micro-capacitance sensor containing distributed power source is arranged on each building roof in city or periphery vacant lot, the distributed power source of this micro-capacitance sensor comprises: any one in single power supply, wind-solar-storage joint power generating source, chemical fuel cell power supply, and described single power supply is photo-voltaic power supply or wind-powered electricity generation power supply; This micro-capacitance sensor adopts AC system to be incorporated to original network system.
Preferably, in photovoltaic plant, blower fan, power-type energy storage device any one or its combination, for the DC load being linked into the same DC bus with its place is powered; Another feeder line place after middle pressure bus has access to other AC load; Another feeder line place after middle pressure bus has access to can power-off load; The power supply reliability requirement of described DC load, higher than the power supply reliability requirement of other loads in this micro-grid connection system.
Another technical scheme of the present invention is to provide the micro-grid connection system in a kind of urban distribution network, wherein comprises successively: transformer station's rank micro-capacitance sensor, feeder line rank micro-capacitance sensor, list/multi-user's rank micro-capacitance sensor;
Described transformer station rank micro-capacitance sensor establishes two switchyards, and two section of first bus is established at each station, connects the first transformer be incorporated to external electrical network by corresponding points of common connection;
Some photovoltaic plants of described list/multi-user's rank micro-capacitance sensor, are linked into second bus of this grade by this grade of corresponding feeder line, and make second bus of this grade be linked into first bus at respective switch station by the second transformer;
Any one or its combination in any in system, other photovoltaic plants sent out by the described list/blower fan of multi-user's rank micro-capacitance sensor, energy-storage system, bavin, is linked into the same section of triple bus-bar of this grade and powers for the DC load being accessed this triple bus-bar by rectifier equally; Described triple bus-bar is also connected with the respective feed connection of feeder line rank micro-capacitance sensor by the 3rd transformer of described feeder line rank micro-capacitance sensor, and connects the 4th transformer to be linked into first bus at respective switch station by the 4th bus of feeder line rank micro-capacitance sensor;
The photovoltaic plant of described feeder line rank micro-capacitance sensor is by a diverter switch, select to be linked into this grade feeder line and and then be directly linked into first bus at respective switch station by the 5th bus of this grade, or select the triple bus-bar being linked into described list/multi-user's rank micro-capacitance sensor of described list/multi-user's rank micro-capacitance sensor;
Any one or its combination in any in the gas turbine of described feeder line rank micro-capacitance sensor, internal combustion engine, energy-storage battery is linked into the 6th bus of this grade, the power supply of the 6th bus is by another diverter switch, select to be linked into the first bus by the feeder line at respective switch station, or select the triple bus-bar being linked into described list/multi-user's rank micro-capacitance sensor.
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 urban distribution network, possess good engineering practicability.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the micro-grid connection system in urban distribution network of the present invention at scheme 1A;
Fig. 2 is the schematic diagram in scheme 1B first embodiment in the present invention;
Fig. 3 is the schematic diagram in scheme 1B second embodiment in the present invention;
Fig. 4 is the schematic diagram at scheme 1C in the present invention;
Fig. 5 is the schematic diagram of the present invention's grid-connected assembled scheme.
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.
Grid-connected target in the present invention is urban distribution network, comprising: urban district, the periphery suburbs, industrial park, the area that the electrical networks such as high-tech park are comparatively flourishing.In region, the original intention that micro-capacitance sensor is often built in different regions is not quite similar, and is generally speaking divided into following several types:
(1) power supply reliability is improved.This grid-connected target is modal often, for the land's end of urban distribution network, often there is this generic request, and particularly some is positioned at the weight industrial load of surrounding city.In this case, enterprise generally considers power plant for self-supply or small power generation equipment, and when under extraneous grid fault conditions, power plant for self-supply starts, for load is powered.
(2) energy alliance mode is adopted to improve energy utilization rate.This grid-connected target is more common in high-tech park or industrial park.Adopt the area general cool and thermal power load close together of this grid-connected target, cooling and heating load is relatively clear and definite, under having electrical network to be the load condition of powering, utilize co-feeding system, meet self cooling and heating load demand on the one hand, improve energy efficiency on the other hand, rely on relevant policies to improve economy to a certain extent.
(3) utilize micro-capacitance sensor to dissolve distributed power source, reduce power consumption or improve house property added value.This situation utilizes in industrial working in city or among a small circle more, uses roof construction more, thus limits the capacity scale of this kind of micro-capacitance sensor.Generally speaking, this micro-capacitance sensor form is changeable, and the characteristic comparing that low capacity is layouted more is obvious.
The electric network composition that the present invention relates to belongs to the region of urban distribution network, is generally city, shopping centre, and high-tech park or weight industrial area, load type is mainly industry and commerce load, city load etc.
For industrial load, large the stablizing of amount is two the most outstanding feature.In addition, for industrial park, high-tech park, industrial load often with Commercial Load, resident load coexists.In this garden, electric power system is more similar with resident load, but relative to resident load, garden internal loading characteristic peak-valley difference is less, and curve is more mild.
It is more that city load comprises content, general main finger service trade, shows the load such as large-scale mall, senior office building, hotel.Generally, large-scale mall, senior office building part throttle characteristics main manifestations are that load curve peak-valley difference is larger, curve comparatively rule and steady load, annual change is little, the peak of its peak of power consumption period and electrical network overall load is comparatively overlapping, and comparatively close with summer, winter temperature variation relation.For hotel, because hotel occupancy rate is uncertain, therefore hotel daily load curve is comparatively uncertain, but on weekdays and festivals or holidays, and between tourist season and dull season, difference is larger.
For with Shangcheng District micro-capacitance sensor construction object, the basic premises such as part throttle characteristics, the present invention proposes the micro-grid connection typical scenario adapting to city network:
scheme 1A:
The building site of this programme be industrial park or other have the place of demand, and grid-connected main target is for improving load power supply reliability.Micro-capacitance sensor power supply sends out based on bavin the power supply that system or gas turbine etc. can stablize output power, for requiring that higher load is powered to power supply reliability, adopting part wind-light storage system to be auxiliary simultaneously, sending out system or gas burning system fuel cost suitably to reduce bavin.Micro-capacitance sensor adopts AC system to be incorporated to the original network system of on-site.
Based in the interchange micro-capacitance sensor of CERTS system, supply load to divide the requirement of Main Basis power supply reliability, higher important load is required for power supply reliability, can be powered by A feeder line, have the support of energy storage device.General load is required to power supply reliability, can be powered by B feeder line, this feeder line is installed a certain amount of distributed power source and power.Other loads can be powered by feeder line C.
On this basis, the typical connect-in strategy of scheme 1A as shown in Figure 1, comprise during external electrical network is connected by transformer and points of common connection (PCC) and press bus, after this, bavin send out system directly and important load access same feeder line A, ensureing can in time for important load be powered when outside grid cut-off; This feeder line of wind-light storage system access A is as auxiliary.General load then accesses another feeder line B.
scheme 1B:
The building site of this programme is positioned at industrial park or high-tech park, and grid-connected main target, for improving energy utilization rate, utilizes energy alliance mode solve cold and heat supply problem in garden and take into account power supply reliability.Micro-capacitance sensor power acquisition is the main synchronous unit of alliance type in order to gas turbine, is aided with low capacity photovoltaic, wind-powered electricity generation and energy storage device, AC system or alternating current-direct current micro-grid system can be adopted to be connected to the grid.
The main distinction of scheme 1B and scheme 1A is that scheme 1B is electricity determining by heat mode, principal security on-site heating and cooling, on the basis ensureing cooling and heating load, and guarantee section electric loading.Therefore, in such micro-capacitance sensor, the power supply reliability of electric loading can only be taken into account, and cannot ensure.
As shown in Figure 2, the synchronous unit of alliance type and the important load of being responsible for cooling and heating load access same feeder line A to the AC system connect-in strategy of scheme 1B; The power supply that photovoltaic plant or blower fan or energy type energy storage device provide as auxiliary, for accessing the power supplies such as other important loads of same feeder line C, important office load; Can be powered by feeder line B by power-off load, and powered by bulk power grid under net state, can excise from this load during network operation.
In addition, scheme 1B can directly select direct current system to be important DC load (as central office) power supply, AC system also can be selected to take into account other loads, structure has bigger difference with scheme 1A.
The ac and dc systems connect-in strategy of scheme 1B as shown in Figure 3, feeder line A, B place is substantially identical with Fig. 2, difference is photovoltaic plant or the access such as blower fan or power-type energy storage device DC bus, for the important office load accessing this DC bus is equally powered; The power supply of DC bus is by accessing feeder line C after inverter, transformer process, and can access at this feeder line C place can power-off load.
scheme 1C:
The building site of this connect-in strategy is positioned at each building roof in city or periphery vacant lot, and grid-connected target is distributed power source of dissolving, small-scale application, improves house property added value.The type of micro-capacitance sensor power supply is mainly considered to adopt the single power supply such as photovoltaic, wind-powered electricity generation, or adopts the type of power such as wind-solar-storage joint generating, chemical fuel cell.The original AC system in house is utilized to be connected to the grid.
The typical connect-in strategy of scheme 1C as shown in Figure 4, photovoltaic plant or the access such as blower fan or power-type energy storage device DC bus, for power by the important office load accessing this DC bus equally; The power supply of DC bus, by after inverter, for the AC load in municipal load, market, supermarket etc. is powered, and can access feeder line C further by transformer; General load and feeder line A, B can be accessed respectively by power-off load.
In sum, scheme 1A is grid-connected target to improve power supply reliability, being applicable to can not the important load of power-off, require high to the quality of power supply, therefore bavin is used to send out system for master, add and join a small amount of wind-light storage system, gas turbine, biomass unit under conditions permit, can be selected, grid-connected in AC system mode; If load is less demanding to the quality of power supply, bavin can be sent out system and replace with wind-light storage system.Option b is grid-connected target to solve cooling and heating load demand, take into account power supply reliability, cooling and heating load must meet, and electric loading is taken into account, power supply is selected based on gas turbine, adds and joins a small amount of wind-light storage, grid-connected by AC system, direct current system mode, electricity determining by heat, does not thus ensure power supply reliability.Scheme 1C is grid-connected target with distributed power source of dissolving, and is applicable to the load such as ordinarily resident, business, selects single power supply or wind-light storage, fuel cell etc. to be main power source, grid-connected in AC system mode.
But in Practical Project, these base cases can not contain all demands, general by being combined, select suitable grid-connected assembled scheme.
An example is as shown in Figure 5 certain institute's micro-capacitance sensor project, grid-connected target is scientific and technical research, take into account the maximum using of the energy and improve the power supply reliability of load, therefore applying more eurypalynous micro-capacitance sensor power supply: photovoltaic electrification component, wind turbine generator, miniature combustion engine group and diesel generating set.This engineering makes full use of photovoltaic generation and the wind generator system that roof in campus and open field install certain capacity, and accesses gas turbine, energy storage device, electric automobile charging station, for institute's internal loading is powered together with bulk power grid.Meanwhile, build intelligent electric power utilization system, realize intelligent power two-way interaction in graduate students'dormitory building.
Exchange a kind of typical structure of micro-capacitance sensor, be main micro-capacitance sensor is set to 10kV switching station as grid structure basis, between switching station bus, bus connection switch generally disconnects; One-level micro-capacitance sensor can be made up of the ring-main unit under this switching station, distribution substation etc., provides power supply respectively by switching station two sections of buses; Secondary micro-capacitance sensor can be made up of user's interior distribution room, and by switching station or ring-main unit, distribution substation powers respectively.
On this basis, transformer station's rank micro-capacitance sensor as shown in Figure 5, feeder line rank micro-capacitance sensor, list/multi-user's rank micro-capacitance sensor (respectively corresponding main micro-capacitance sensor, one-level micro-capacitance sensor, secondary micro-capacitance sensor) is defined in this example.Transformer station's rank micro-capacitance sensor establishes two switchyards, and two sections of buses are established at each station; The photovoltaic plant of list/multi-user's rank micro-capacitance sensor can access a bus of this grade by corresponding feeder line, and makes the bus of this grade by the bus at transformer access respective switch station; The same section of bus of these grades of access such as system sent out by the photovoltaic plant of list/multi-user's rank micro-capacitance sensor, blower fan, energy-storage system, bavin, can power for the DC load accessing this section of bus equally by rectifier in this grade, and this same section of bus is linked into a feeder line of feeder line rank micro-capacitance sensor by transformer; The power supply that can obtain from described list/multi-user's rank micro-capacitance sensor of the bus of feeder line rank micro-capacitance sensor is linked into the bus of respective switch station feeder line and then access switchyard by transformer, or also can obtain the power supply of the photovoltaic plant of this feeder line rank micro-capacitance sensor feeder line of access, and directly by the bus of the feeder line access switchyard at respective switch station; The photovoltaic plant of feeder line rank micro-capacitance sensor, selects the feeder line of this grade of access by a diverter switch, or selects described same section of bus of access described list/multi-user's rank micro-capacitance sensor; The gas turbine, internal combustion engine, energy-storage battery etc. of described feeder line rank micro-capacitance sensor, a diverter switch is connected by this level one bus, to select access one feeder line at respective switch station and then the bus at connecting valve station, or select described same section of bus of access described list/multi-user's rank micro-capacitance sensor.
This project is positioned at urban district, periphery electrical network belongs to urban distribution network, and this project object is build the micro-grid system of a set of perfect in shape and function, based on scientific research demand, take into account the maximum using realizing photovoltaic, blower fan regenerative resource, therefore consider that base case is scheme 1A and scheme 1C, both schemes are combined, both meet the requirement improving power supply reliability, also can meet multiple micro-capacitance sensor power supply and comprehensively use the scientific research value brought, make this project meet the scientific research requirement of many loads, many power supplys.
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 (10)
1. the micro-grid connection system in urban distribution network, is characterized in that,
Described micro-grid connection system, to comprise with middle pressure bus through points of common connection connection transformer to access any one micro-capacitance sensor following or its combination in any of external electrical network:
System or gas turbine is sent out to provide the bavin of stable output power, for with described bavin send out system or gas turbine be linked into middle pressure bus after the AC load of wherein same feeder line power, and wind-light storage system access is to the auxiliary power supply source of this feeder line as described AC load;
To be responsible for carrying out cold and heat supply to cooling and heating load containing the synchronous unit of alliance type of gas turbine, and power for the AC load of the wherein same feeder line after being linked into middle pressure bus with the synchronous unit of this alliance type;
Power supply is that the DC load accessing same DC bus with described distributed power source is powered in a distributed manner; Power supply on described DC bus is that the AC load accessing same ac bus is powered by accessing an ac bus after inverter; The power supply of described ac bus is by being linked into one of them feeder line after middle pressure bus after another transformer.
2. the micro-grid connection system in urban distribution network as claimed in claim 1, is characterized in that,
Sending out system or gas turbine with bavin is the micro-capacitance sensor that the AC load of same feeder line is powered, and be arranged on industrial park, this micro-capacitance sensor adopts AC system to be incorporated to original network system.
3. the micro-grid connection system in urban distribution network as claimed in claim 1 or 2, is characterized in that,
With same feeder line apoplexy light-preserved system and the AC load that provides the bavin of stable output power to send out system or gas turbine to power, its power supply reliability requires the power supply reliability requirement higher than other loads being linked into another feeder line.
4. the micro-grid connection system in urban distribution network as claimed in claim 2, is characterized in that,
Send out in the micro-capacitance sensor of system or gas turbine containing the bavin stablizing output power, be provided with the grid-connected gas turbine of AC system or biomass unit; Or, in this micro-capacitance sensor, replace described bavin with wind-light storage system and send out system for described AC load and power.
5. the micro-grid connection system in urban distribution network as claimed in claim 1, is characterized in that,
To be responsible for cold and heat supply containing the synchronous unit of alliance type of gas turbine and to take into account the micro-capacitance sensor that the AC load for same feeder line powers, be arranged on industrial park or high-tech park; This micro-capacitance sensor adopts AC system when being incorporated to original network system, and any one or its combination in any in the photovoltaic plant at another feeder line place after middle pressure bus, blower fan, energy type energy storage device is that the AC load being linked into this another feeder line carries out auxiliary power supply; Another feeder line place after middle pressure bus has access to can power-off load.
6. the micro-grid connection system in urban distribution network as claimed in claim 1, is characterized in that,
To be responsible for cold and heat supply containing the synchronous unit of alliance type of gas turbine and to take into account the micro-capacitance sensor that the AC load for same feeder line powers, be arranged on industrial park or high-tech park; This micro-capacitance sensor adopts ac and dc systems when being incorporated to original network system, and any one or its combination in any in photovoltaic plant, blower fan, power-type energy storage device, for the DC load being linked into the same DC bus with its place carries out auxiliary power supply;
The power supply of DC bus by being linked into another feeder line after middle pressure bus after inverter connection transformer, and can be powered by power-off load for some being linked into this another feeder line; Another feeder line place after middle pressure bus has access to other can power-off load.
7. the micro-grid connection system in the urban distribution network as described in claim 5 or 6, is characterized in that,
Another feeder line place access after middle pressure bus can power-off load, its power supply reliability requires lower than the AC load at other feeder line places or the power supply reliability requirement of DC load.
8. the micro-grid connection system in urban distribution network as claimed in claim 1, is characterized in that,
Micro-capacitance sensor containing distributed power source is arranged on each building roof in city or periphery vacant lot, the distributed power source of this micro-capacitance sensor comprises: any one in single power supply, wind-solar-storage joint power generating source, chemical fuel cell power supply, and described single power supply is photo-voltaic power supply or wind-powered electricity generation power supply; This micro-capacitance sensor adopts AC system to be incorporated to original network system.
9. the micro-grid connection system in urban distribution network as claimed in claim 8, is characterized in that,
In photovoltaic plant, blower fan, power-type energy storage device any one or its combination, for the DC load being linked into the same DC bus with its place is powered; Another feeder line place after middle pressure bus has access to other AC load; Another feeder line place after middle pressure bus has access to can power-off load; The power supply reliability requirement of described DC load, higher than the power supply reliability requirement of other loads in this micro-grid connection system.
10. the micro-grid connection system in urban distribution network, is characterized in that, comprise successively: transformer station's rank micro-capacitance sensor, feeder line rank micro-capacitance sensor, list/multi-user's rank micro-capacitance sensor;
Wherein, described transformer station rank micro-capacitance sensor establishes two switchyards, and two section of first bus is established at each station, connects the first transformer be incorporated to external electrical network by corresponding points of common connection;
Some photovoltaic plants of described list/multi-user's rank micro-capacitance sensor, are linked into second bus of this grade by this grade of corresponding feeder line, and make second bus of this grade be linked into first bus at respective switch station by the second transformer;
Any one or its combination in any in system, other photovoltaic plants sent out by the described list/blower fan of multi-user's rank micro-capacitance sensor, energy-storage system, bavin, is linked into the same section of triple bus-bar of this grade and powers for the DC load being accessed this triple bus-bar by rectifier equally; Described triple bus-bar is also connected with the respective feed connection of feeder line rank micro-capacitance sensor by the 3rd transformer of described feeder line rank micro-capacitance sensor, and connects the 4th transformer to be linked into first bus at respective switch station by the 4th bus of feeder line rank micro-capacitance sensor;
The photovoltaic plant of described feeder line rank micro-capacitance sensor is by a diverter switch, select to be linked into this grade feeder line and and then be directly linked into first bus at respective switch station by the 5th bus of this grade, or select the triple bus-bar being linked into described list/multi-user's rank micro-capacitance sensor of described list/multi-user's rank micro-capacitance sensor;
Any one or its combination in any in the gas turbine of described feeder line rank micro-capacitance sensor, internal combustion engine, energy-storage battery is linked into the 6th bus of this grade, the power supply of the 6th bus is by another diverter switch, select to be linked into the first bus by the feeder line at respective switch station, or select the triple bus-bar being linked into described list/multi-user's rank micro-capacitance sensor.
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