CN105226718A - Micro-grid connection system in areas without electricity - Google Patents
Micro-grid connection system in areas without electricity Download PDFInfo
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Abstract
In micro-grid connection system in areas without electricity provided by the invention, wind-light storage system is that the situation load being linked into same ac bus by rectifier is powered by inverter, and connect a DC bus by corresponding rectifier, for the equipment accessing this DC bus is powered; Or wind-light storage system is that the resident load accessing same DC bus is powered, and for access another is DC bus powered, for the equipment being linked into this another DC bus is separately powered.Or wind-light storage system presses bus in connecting, for the load directly accessing thereafter each feeder line is powered.In addition, the present invention is provided with bavin and sends out system for needing to provide the load of long-time electric power, can not carrying out auxiliary power supply by power-off load.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 areas without electricity or island 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 areas without electricity, for the situation of areas without electricity or island network, according to different grid-connected targets and supply load, the micro-capacitance sensor typical case connect-in strategy adapted is proposed.
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 areas without electricity, and wherein, wind-light storage system is powered by inverter incoming transport bus; Resident load accesses this ac bus with the first rectifier and obtains electric power; Being provided with bavin and sending out system access to described ac bus, carrying out auxiliary power supply for needing the load providing long-time electric power in resident load; This ac bus and a DC bus is connected, for the equipment accessing this DC bus is separately powered by the second rectifier.
Preferably, the wind-light storage system of replacing in described micro-grid connection system is powered for directly accessing the first DC bus; Resident load directly accesses this first DC bus and obtains electric power;
Second DC bus accesses the first DC bus and obtains electric power, and is that the equipment being linked into this second DC bus is separately powered; Bavin is sent out system and is accessed to described first DC bus by rectifier, carries out auxiliary power supply for needing the load providing long-time electric power in resident load.
Preferably, described wind-light storage system comprises any one in photovoltaic plant, blower fan, energy type energy-storage system or its combination in any.
Preferably, described micro-grid connection Operation system setting is in the workload demand roof in each house, area and periphery vacant lot.
Another technical scheme of the present invention is to provide the micro-grid connection system in a kind of areas without electricity, wherein comprises: wind-light storage system is by pressing bussed supply in connection one, and some first loads are directly linked into the first feeder line after middle pressure bus respectively; The bus at the second load place is linked into the second feeder line after middle pressure bus by transformer, and bavin sends out Operation system setting on the bus at the second load place; The power supply reliability of described second load requires higher than the first load.
Preferably, described first load is can power-off load, and described second load is can not power-off load;
Described first load is also directly linked into the second feeder line.
Preferably, described micro-grid connection system arranges the wind-light storage system of multi-user's rank in periphery vacant lot, workload demand area and system sent out by bavin, and simultaneously supportingly has power distribution network, utilizes AC system to provide electric power for each user.
Preferably, described micro-grid connection system arranges wind-light storage system on the roof of each user or periphery vacant lot and system sent out by bavin, and be directly customer power supply, each user does not have electrical link each other.
Preferably, described wind-light storage system comprises any one or its combination in any in photovoltaic plant, blower fan, energy type energy-storage system.
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 areas without electricity or island network, possess good engineering practicability.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the micro-grid connection system in areas without electricity of the present invention in scheme 3A first embodiment;
Fig. 2 is the schematic diagram in scheme 3A second embodiment in the present invention;
Fig. 3 is the schematic diagram at scheme 3B in the present invention;
Fig. 4 is the schematic diagram of the present invention's concrete connect-in strategy.
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.
Network system in the present invention is weaker, and many employing single supply radial construction, without getting in touch with or getting in touch with less between feeder line, but often new forms of energy enrich.For areas without electricity or island network area, micro-grid connection target comprises following several types:
1, for areas without electricity provides electric power.Under this grid-connected target, distributing or centralized synchronizing mode can be adopted.Distributing utilizes wind-light storage system, system etc. sent out by small-sized bavin, is installed on each user roof or periphery vacant lot, and utilize interchange or direct current to be directly customer power supply, each user does not have electrical link each other.Centralized is a unit with a village or a few domestic electricity load, and system etc. sent out by vacant lot, build multi-user's rank wind-light storage, bavin, simultaneously auxiliary construction power distribution network, utilizes AC system to provide electric power for each user.
2, power supply reliability is improved.Some Island is mainly positioned at the micro-capacitance sensor of this grid-connected target construction.Load type comprises simply civilian, commercial and special military load.Military load is mainly coast defence or marine monitoring, radar etc. require high load to power supply reliability.In view of this type load, only cannot meet this kind of workload demand by regenerative resource stable not of exerting oneself, also need to consider that configuration bavin sends out system, UPS(uninterrupted power supply) etc. power supply provide electric power for military load.For resident's Commercial Load in general island, adopt general regenerative resource as micro-capacitance sensor power supply.Needs particularly point out, and from net type micro-capacitance sensor owing to not having the support of bulk power grid, especially need the requirement focusing on the quality of power supply.
The workload demand of areas without electricity compares urban distribution network and rural power grids are more simple.In general, the industrial load of areas without electricity, Commercial Load is less and less demanding to power supply reliability, and most load is resident load, comprise electric light, electric fan, TV, broadcast receiver, a small amount of computer, water pump etc., less demanding to the quality of power supply, power supply reliability.Only need under individual cases to consider military load.
scheme 3A:
The building site of this programme is roof and the periphery vacant lot in each house, workload demand area, and grid-connected target provides electric power for load, and load is simple household electrical appliance.Micro-capacitance sensor power supply, based on wind-light storage system, needs individually to provide the load of long-time electric power (as refrigerator) to add and joins small-sized bavin to send out system.Interchange or direct current is adopted to be customer power supply.
As shown in Figure 1, a bus at photovoltaic plant, blower fan, energy type energy-storage system place, by inverter access (being such as 380V's) ac bus for the AC system connect-in strategy of scheme 3A; Resident load accesses this ac bus with rectifier and obtains electric power, and connect this ac bus and one (such as 48V's) DC bus with corresponding rectifier, electronic equipment, the small desk top device etc. such as computer separately this DC bus of access obtain electric power.System access is sent out to described ac bus for needing to provide the load of long-time electric power to add the bavin of joining.
As shown in Figure 2, the bus at photovoltaic plant, blower fan, energy type energy-storage system place, directly accesses first DC bus of (such as 380V) to the direct current system connect-in strategy of scheme 3A; Resident load directly accesses this first DC bus and obtains electric power; (such as 48V's) second DC bus accesses the first DC bus, for the electronic equipments such as computer, small desk top device are powered; Described bavin is sent out system and is accessed to described first DC bus by rectifier.
scheme 3B:
The building site of this programme is periphery vacant lot, workload demand area, and grid-connected target provides electric power for load, and load is simple household electrical appliance.Micro-capacitance sensor power supply, based on wind-light storage system, needs individually to provide the load of long-time electric power (as refrigerator) can add in user side and joins small-sized bavin to send out system.Inconsistent with scheme 3A, it is all customer power supplies in this area that program 3B passes through centralized, takes into account areas without electricity space truss project simultaneously, adopts and exchanges as customer power supply.
The typical connect-in strategy of scheme 3B as shown in Figure 3, photovoltaic plant, blower fan, energy type energy-storage system by pressing bussed supply in connection one, feeder line A, B after power supply reliability requires general load to be linked into middle pressure bus respectively; Power supply reliability requires that the bus at high important load place is by transformer access feeder line C, adds the bavin of joining and sends out Operation system setting on the bus at this important load place.
In sum, scheme 3A, 3B are areas without electricity (or island network) power supply, and the workload demand be suitable for is simple residential electricity consumption, and power supply is selected based on wind-light storage, and system sent out by indivedual important load configuration bavin; The synchronizing mode that scheme 3A is suitable for is AC system or direct current system, and scheme 3B is then AC system, and use concentration supply power, wind-light storage capacity is larger.
Below provide the areas without electricity micro-capacitance sensor project that concrete, the target of micro-grid connection is that the load being badly in need of electricity consumption in village is powered.Under this grid-connected target, distributing or centralized synchronizing mode can be adopted, distributing utilizes wind-light storage, small-sized bavin sends out system etc., be installed on each user roof or periphery vacant lot, utilize interchange or direct current to be directly customer power supply, each user does not have electrical link each other.Centralized is a unit with a village or a few domestic electricity load, and system etc. sent out by vacant lot, build multi-user's rank wind-light storage, bavin, simultaneously auxiliary construction power distribution network, utilizes AC system to provide electric power for each user.
The concentration supply power scheme that this example realizes on connect-in strategy 3B basis as shown in Figure 4, is considered to build a light electricity storage station in the vacant lot in each village, and in village the AC distribution net of planning construction 10kV electric pressure, be each customer power supply.This engineering micro-capacitance sensor builds capacity, can with village size, and workload demand changes.
In the example of Fig. 4, water pump is as accessing feeder line A by power-off load, and some street lamps, school etc. are as accessing feeder line B by power-off load, and resident load is as accessing feeder line C by power-off load; Hospital's load as can not power-off load, its place bus access feeder line C, and be furnished with bavin send out Operation system setting can not on the place bus of power-off load for it adds.
The demand of all loads of this engineering for power supply reliability has been taken into full account in the connect-in strategy of this example, water pump only used twice in one day, lower to power supply reliability demand, street lamp is not opened daytime, night is opening section only, plays base lighting effect, can power-off at any time, do not have senior power load in school, power load is electric fan and broadcast only.Be mainly the small-power power consumption equipments such as electric light, electric fan, broadcast receiver in resident load, therefore above load requires all lower to power supply reliability, powers, no longer consider other power supplys by means of only light electricity storage station.Hospital's load comprises refrigerator load, and needing provides low temperature to store medicine for a long time, requires higher to power supply reliability, therefore considers to add in micro-grid connection scheme to join bavin and send out system with emergency service.
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 (9)
1. the micro-grid connection system in areas without electricity, is characterized in that,
Wind-light storage system is powered by inverter incoming transport bus; Resident load accesses this ac bus with the first rectifier and obtains electric power; Being provided with bavin and sending out system access to described ac bus, carrying out auxiliary power supply for needing the load providing long-time electric power in resident load; This ac bus and a DC bus is connected, for the equipment accessing this DC bus is separately powered by the second rectifier.
2. the micro-grid connection system in areas without electricity as claimed in claim 1, is characterized in that,
The wind-light storage system of replacing in described micro-grid connection system is powered for directly accessing the first DC bus; Resident load directly accesses this first DC bus and obtains electric power;
Second DC bus accesses the first DC bus and obtains electric power, and is that the equipment being linked into this second DC bus is separately powered; Bavin is sent out system and is accessed to described first DC bus by rectifier, carries out auxiliary power supply for needing the load providing long-time electric power in resident load.
3. the micro-grid connection system in areas without electricity as claimed in claim 1 or 2, is characterized in that,
Described wind-light storage system comprises any one in photovoltaic plant, blower fan, energy type energy-storage system or its combination in any.
4. the micro-grid connection system in areas without electricity as claimed in claim 1 or 2, is characterized in that,
Described micro-grid connection Operation system setting is in the workload demand roof in each house, area and periphery vacant lot.
5. the micro-grid connection system in areas without electricity, is characterized in that, comprise:
Wind-light storage system is by pressing bussed supply in connection one, and some first loads are directly linked into the first feeder line after middle pressure bus respectively; The bus at the second load place is linked into the second feeder line after middle pressure bus by transformer, and bavin sends out Operation system setting on the bus at the second load place; The power supply reliability of described second load requires higher than the first load.
6. the micro-grid connection system in areas without electricity as claimed in claim 5, is characterized in that,
Described first load is can power-off load, and described second load is can not power-off load;
Described first load is also directly linked into the second feeder line.
7. the micro-grid connection system in the areas without electricity as described in claim 5 or 6, is characterized in that,
Described micro-grid connection system arranges the wind-light storage system of multi-user's rank in periphery vacant lot, workload demand area and system sent out by bavin, and simultaneously supportingly has power distribution network, utilizes AC system to provide electric power for each user.
8. the micro-grid connection system in the areas without electricity as described in claim 5 or 6, is characterized in that,
Described micro-grid connection system arranges wind-light storage system on the roof of each user or periphery vacant lot and system sent out by bavin, and be directly customer power supply, each user does not have electrical link each other.
9. the micro-grid connection system in areas without electricity as claimed in claim 5, is characterized in that,
Described wind-light storage system comprises any one or its combination in any in photovoltaic plant, blower fan, energy type energy-storage system.
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