CN101436778A - Networking method for minitype electric network - Google Patents
Networking method for minitype electric network Download PDFInfo
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- CN101436778A CN101436778A CNA200810219883XA CN200810219883A CN101436778A CN 101436778 A CN101436778 A CN 101436778A CN A200810219883X A CNA200810219883X A CN A200810219883XA CN 200810219883 A CN200810219883 A CN 200810219883A CN 101436778 A CN101436778 A CN 101436778A
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Abstract
The invention discloses a networking method for a micro grid. The method is characterized in that: an AC generation source is connected with a DC bus through an AC/DC converter; a DC generation source is connected with the DC bus through a DC/DC converter; the DC bus is connected with a large power grid through a grid-connected inverter; the DC bus is connected with a power accumulator; and the AC/DC converter, the DC/DC converter and the grid-connected inverter are controlled by a system controller. The micro grid of the invention can be connected with a plurality of generation sources with different power generation properties and promote the development of micro grids. A networking structure of the DC bus can reduce the control difficulty of the micro grid and improve the power supply quality of the micro grid. The networking structure of the DC bus has a great advantage in connection of the micro grid to the large power grid and can adjust the grid-connection output active power and inactive power of the micro grid through the grid-connected inverter during grid connection in favor of the large power grid.
Description
Technical field
The present invention relates to the network-building method of micro power network, especially at the micro power network networking that contains different power generation characteristics energy sources.
Background technology
The microgrid technology is meant the system that the generating resource (for example Blast Furnace Top Gas Recovery Turbine Unit (TRT) such as generating equipment of powering voluntarily or stand-by generator group, device of solar generating, wind power plant, diesel generation) of the dispersion that will have in certain zone is tied, it can be powered to the user, also can pass through distribution link and the parallel running of trunk large-scale power net.
Chinese patent ZL02136471.0 discloses a kind of distributed power networking and supply power mode.It adopts distributed small generator, and the generator in an area is networked mutually, and the user inserts in the electrical network, and also networking between each user.But concrete network-building method is not disclosed in this patent.
Dong Xue equality is in " honourable bavin holds the computer control system of composite intelligent electric power system " (computer measurement and control, 2002 6 phases) introduced a kind of wind-light-Chai-hold compound power-generating and intelligence control system experimental provision in the literary composition, the electric power transmission network of the micro power network of composition adopts direct current and exchanges the mode of transmitting electricity simultaneously.
Along with the continuous development of micro power network, the adding of all kinds of different output voltage electric current energy sources, the composition of micro power network becomes increasingly complex, and just there has been following deficiency in existing networking technology:
At first, if be incorporated into the power networks by interchange in the alternative electric generation source, will be strict with the generating frequency in alternative electric generation source, the size and the phase place of voltage, control has increased difficulty to micro power network for this, can not well guarantee online voltage, as wind turbine generator.
Secondly adopt and hand over the straight electric power transmission network that mixes, its cost cost is than higher.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, the networking method for minitype electric network that a kind of system configuration is succinct, control conveniently, easily expand is provided.
The objective of the invention is to realize by the following method:
A kind of networking method for minitype electric network, it is characterized in that the alternative electric generation source is connected on the dc bus by the AC/DC converter, the DC generation source is connected on the dc bus by the DC/DC converter, dc bus links to each other with big electrical network by combining inverter, be connected with accumulator on the dc bus, AC/DC converter, DC/DC converter and combining inverter are controlled by system controller all.
The alternative electric generation source comprises non-constant alternative electric generation source and controlled power, voltage constant alternative electric generation source.
If accumulator is the dc energy storage device,, then link to each other with dc bus by the DC-DC converter as storage battery, if for exchanging accumulator,, then link to each other with dc bus by the DC-AC converter as flywheel, also can both comprise the dc energy storage device in the micro power network, comprise the interchange accumulator again.
DC bus-bar voltage is preferably 300～500v.When the micro power network energy source did not have controlled, constant alternative electric generation source, when for example having only wind turbine generator, DC bus-bar voltage was controlled at 300v, and such micro power network is easy to control and keeps constant voltage.When the micro power network energy source has controlled, constant alternative electric generation source, keep DC bus-bar voltage 500v.
Compared with prior art, the present invention has following advantage:
Micro power network can add the energy source of a lot of different power generation characteristics, and the development of micro power network is played a driving role.The networking structure of dc bus can reduce the control difficulty of micro power network and improve the power supply quality of micro power network.
The networking structure of dc bus can reduce the cost of the micro power network of different energy sources compositions, have only two buses to link to each other between the different energy sources, can reduce transmission loss, the control difficulty that is incorporated into the power networks in the alternative electric generation source reduces, the corresponding reduction of its controller cost, be incorporated into the power networks by the DC/DC converter and reduce the also corresponding reduction of controlling cost than the difficulty by inversion grid connection in the DC generation source.
The networking structure of dc bus tool micro power network is incorporated into the power networks link to big electrical network on has great advantage, and can regulate the idle and active power of output that is incorporated into the power networks of micro power network when being incorporated into the power networks by combining inverter, and this is very favourable to big electrical network.
Description of drawings
Fig. 1 has the micro power network structural representation of dc bus.
Embodiment
Below in conjunction with accompanying drawing the present invention is done to describe in further detail.
Dc bus micro power network as shown in Figure 1, it comprises DC generation source 1, non-constant alternative electric generation source 3, controlled power, voltage constant alternative electric generation source 5, DC load 15, AC load 7, inverter 8, combining inverter 16, holder 11,13, system controller 14.
(1) dc bus 9 voltages are a constant voltage V by the system controller setting, DC generation source 1 (as solar power generation) makes output voltage remain constant voltage V by DC/DC converter 2, system controller 14 detects DC generation source power output, gives 2 one voltage hold instructions of DC/DC converter.
(2) non-constant alternative electric generation source 3 (as wind power generations) make output voltage remain on constant voltage V by AC/DC converter 4, after system controller 14 obtains the power output in non-constant alternative electric generation source 3, provide a voltage hold instruction and give AC/DC converter 4.
(3) controlled power, voltage constant alternative electric generation source 5 (as natural gas power, diesel generation, hydroelectric power generation) remain on constant voltage V by AC/DC converter 6 with output voltage, system controller 14 is by detecting the voltage and the power output in DC generation source 1, non-constant alternative electric generation source 3, and the voltage of dc bus 9, send power instruction for alternative electric generation source 5, to keep busbar voltage at constant voltage V.
(4) interchange holder 11,13 pairs of dc buss of DC storage device play flat peak and keep instantaneous voltage stable, when DC bus-bar voltage is higher than constant voltage V, exchange holder 11 and absorb the electrical network energy by DC/AC converter 10, simultaneously, DC storage device 13 absorbs the electrical network energy by DC/DC converter 12, when DC bus-bar voltage was lower than constant voltage V, holder was exported energy to electrical network, kept DC bus-bar voltage to be stabilized in constant voltage V.
(5) AC load 7 links to each other with dc bus 9 by inverter 8, absorbs energy from electrical network.
(6) DC load 15 directly links to each other with dc bus 9, absorbs energy from bus.Dc bus 9 also can be powered to DC load 15 by the DC/DC converter.
(7) system controller 14 detects the power output and the bearing power of all energy sources, when micro power network sends power greater than DC load and AC load sum, and micro power network is when also having power output and regulating surplus, and combining inverter 16 is started working, and micro power network is to big electrical network power output; When micro power network peak power output during less than the load summation, combining inverter is started working, from big electrical network intake.
Claims (5)
1, a kind of networking method for minitype electric network, it is characterized in that the alternative electric generation source is connected on the dc bus by the AC/DC converter, the DC generation source is connected on the dc bus by the DC/DC converter, dc bus links to each other with big electrical network by combining inverter, be connected with accumulator on the dc bus, AC/DC converter, DC/DC converter and combining inverter are controlled by system controller all.
2, networking method for minitype electric network according to claim 1 is characterized in that the alternative electric generation source comprises non-constant alternative electric generation source and controlled power, voltage constant alternative electric generation source.
3, network-building method according to claim 2 is characterized in that accumulator is the dc energy storage device, and it links to each other with dc bus by the DC/DC converter.
4, network-building method according to claim 2 is characterized in that accumulator is to exchange accumulator, and it links to each other with dc bus by the DC/AC converter.
5,, it is characterized in that DC bus-bar voltage is 300～500v according to each described network-building method of claim 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNA200810219883XA CN101436778A (en) | 2008-12-12 | 2008-12-12 | Networking method for minitype electric network |
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| CNA200810219883XA CN101436778A (en) | 2008-12-12 | 2008-12-12 | Networking method for minitype electric network |
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| CN101436778A true CN101436778A (en) | 2009-05-20 |
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| CN102025155A (en) * | 2010-12-30 | 2011-04-20 | 梁一桥 | DC (direct current) distribution-based microgrid system |
| CN102074952A (en) * | 2010-12-03 | 2011-05-25 | 中国科学院广州能源研究所 | Independent micro-grid system |
| CN102097803A (en) * | 2010-05-11 | 2011-06-15 | 珠海兴业新能源科技有限公司 | Grading control micro power grid networking method |
| CN102347620A (en) * | 2010-07-30 | 2012-02-08 | 北京市电力公司 | Micro grid control method |
| CN102496961A (en) * | 2011-12-28 | 2012-06-13 | 中国水利水电科学研究院 | Direct-current-bus-based wind-solar independent power grid system |
| CN102549902A (en) * | 2009-09-30 | 2012-07-04 | 松下电器产业株式会社 | Power distribution system |
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| CN105207340A (en) * | 2015-09-08 | 2015-12-30 | 江苏绿扬电子仪器集团有限公司 | Wind-solar complementation new energy application experiment platform |
| CN105226630A (en) * | 2015-11-03 | 2016-01-06 | 国网浙江省电力公司电力科学研究院 | A kind of control method of direct current micro-grid system and system |
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| CN105846465A (en) * | 2016-05-13 | 2016-08-10 | 中国农业大学 | Alternating current and direct current hybrid power supply system and method |
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2008
- 2008-12-12 CN CNA200810219883XA patent/CN101436778A/en active Pending
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| CN102347620A (en) * | 2010-07-30 | 2012-02-08 | 北京市电力公司 | Micro grid control method |
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| CN102074952A (en) * | 2010-12-03 | 2011-05-25 | 中国科学院广州能源研究所 | Independent micro-grid system |
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| CN102496961A (en) * | 2011-12-28 | 2012-06-13 | 中国水利水电科学研究院 | Direct-current-bus-based wind-solar independent power grid system |
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Open date: 20090520 |