CN207603234U - A kind of microgrid for considering grid entry point afterflow is seamless and off-network switching system - Google Patents
A kind of microgrid for considering grid entry point afterflow is seamless and off-network switching system Download PDFInfo
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- CN207603234U CN207603234U CN201721792378.5U CN201721792378U CN207603234U CN 207603234 U CN207603234 U CN 207603234U CN 201721792378 U CN201721792378 U CN 201721792378U CN 207603234 U CN207603234 U CN 207603234U
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Abstract
The utility model is related to a kind of microgrid for considering grid entry point afterflow, seamless and off-network switching system, belongs to electric system microgrid field.The system accesses AC/DC converters and super capacitor in the grid entry point of microgrid and power grid, AC/DC converters are stablized actively and in off-network handoff procedure as power good microgrid power-balance and maintenance voltage, improve the success rate that actively simultaneously off-network switches, AC/DC converters provide short circuit current for electric network fault point as power supply in passive and off-network handoff procedure and clamp down on microgrid voltage, ensure the time of simultaneously off-network switching, improve the success rate of passive and off-network switching.
Description
Technical field
The utility model is related to a kind of microgrid for considering grid entry point afterflow, seamless and off-network switching system, belongs to electric system
The technical field of microgrid.
Background technology
The operational mode of microgrid includes being incorporated into the power networks and off-grid operation, and off-network switching comprising actively and off-network and it is passive simultaneously
Off-network, microgrid internal power influence handover success rate whether balance.Actively and off-network can be according to schedule by dominant eigenvalues control
It is made as 0 and then realizes the power-balance in microgrid, pattern switching is completed so as to successfully disconnect grid entry point switch；Passive and off-network fortune
When occurring used in isolated island, microgrid needs to first pass through isolated island detection protection discovery island state, and adjusting microgrid internal power balance
Grid entry point switch is disconnected again afterwards so as to complete pattern switching.Therefore, passive and off-grid switching time can be longer, meanwhile, isolated island
Generally all along with electric network faults such as short circuit, decompressions during generation, this so that microgrid needs send power to bulk power grid or are short
Waypoint provides short circuit current, this so that microgrid internal power is extremely unbalance within the period of passive and off-network switching, so as to lead
It causes the voltage of microgrid, frequency unstable or even there is a situation where microgrid collapses net.
Utility model content
The goal of the invention of the utility model is the deficiency for above-mentioned background technology, provides a kind of consideration grid entry point afterflow
Microgrid is seamless and off-network switching system, by accessing AC/DC converters and super capacitor in grid entry point, enhance inside microgrid
The ability of power-balance, and then microgrid and off-grid success rate are improved, it solves the passive off-network scheme of existing microgrid and switches to
Power is bad and the technical issues of microgrid internal power is unbalance.
The utility model adopts the following technical scheme that for achieving the above object：
A kind of microgrid for considering grid entry point afterflow is seamless and off-network switching system, including：First switch, second switch, AC/
DC converters, super capacitor, one end of the first switch are connect with power grid side bus, and one end and microgrid side of second switch are female
Line connection, the other end of first switch and the other end of second switch simultaneously connect to form grid entry point, the inversion side joint of AC/DC converters
The grid entry point, the direct current side joint super capacitor of AC/DC converters.
As consider grid entry point afterflow microgrid is seamless and off-network switching system advanced optimizes scheme, first switch and
Second switch is the high-speed switch for having the function of to be remotely controlled folding.
As consider grid entry point afterflow microgrid is seamless and off-network switching system advanced optimizes scheme, AC/DC transformation
Device is single stage type converter or stage type converter.
As consider grid entry point afterflow microgrid is seamless and off-network switching system advanced optimizes scheme, super capacitor
Model GMCC-SC-003R0-650.
The utility model uses above-mentioned technical proposal, has the advantages that：The utility model is in microgrid and power grid
Grid entry point accesses AC/DC converters and super capacitor, and AC/DC converters actively and in off-network handoff procedure are being used as power good
Microgrid power-balance and and maintenance voltage stablize, improve actively and the success rate of off-network switching, AC/DC converters are passively simultaneously
Short circuit current is provided for electric network fault point as power supply in off-network handoff procedure and clamp down on microgrid voltage, ensure simultaneously off-network switching
Time improves the success rate of passive and off-network switching.
Description of the drawings
Fig. 1 be consider grid entry point afterflow microgrid is seamless and the topological diagram of off-network switching system.
Specific embodiment
The technical solution of utility model is described in detail below in conjunction with the accompanying drawings.
The utility model is related to microgrid is seamless and off-network switching system as shown in Figure 1, including：First switch K0, second
K1, AC/DC converters, super capacitor in sagging operating status are switched, one end and the power grid side bus of first switch K0 connect
It connects, one end of second switch K1 is connect with microgrid side bus, and the other end of first switch K0 and the other end of second switch K1 are simultaneously
It connects to form grid entry point, the inverter side of AC/DC converters connects grid entry point by power line, and the DC side of AC/DC converters passes through electricity
The line of force connects super capacitor.
When microgrid and power grid are incorporated into the power networks, first switch K0, second switch K1 are closed, in sagging operating status
AC/DC converters charge to after can will being direct current from the AC rectification that grid entry point acquires as charger to super capacitor
Target SOC.
During actively simultaneously off-network switches, for because caused by load or the fluctuation of generator unit inside microgrid
Power imbalances, the direct current that the AC/DC converters in sagging operating status can store super capacitor as main power source are inverse
Microgrid is transmitted to after change to stablize the power-balance of microgrid and maintenance voltage stabilization, after microgrid power-balance, first is disconnected and opens
K0, second switch K1 are closed, ensure that actively the simultaneously success rate of off-network switching.
During the switching of passive and off-network, the AC/DC converters in sagging operating status can be used as main power source
Power grid and microgrid will be transmitted to after the DC inverter of super capacitor storage, short circuit current can be provided to electric network fault point and clamped
Microgrid voltage processed after microgrid power-balance, disconnects first switch K0, second switch K1, ensure that the time of simultaneously off-network switching,
Improve the success rate of passive and off-network switching.
Above-described embodiment of the utility model is only intended to clearly illustrate the utility model example, and is not pair
The restriction of the utility model embodiment.For those of ordinary skill in the art, on the basis of the above description also
It can make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all
The all any modification, equivalent and improvement made within the spirit and principles of the utility model should be included in the utility model power
Within the protection domain of profit requirement.
Claims (4)
1. a kind of microgrid for considering grid entry point afterflow is seamless and off-network switching system, which is characterized in that including：First switch,
Two switches, AC/DC converters, super capacitor, one end of the first switch are connect with power grid side bus, one end of second switch
It is connect with microgrid side bus, the other end of first switch and the other end of second switch simultaneously connect to form grid entry point, AC/DC converters
Inversion side joint described in grid entry point, the direct current side joint super capacitor of AC/DC converters.
2. according to claim 1 it is a kind of consider grid entry point afterflow microgrid is seamless and off-network switching system, which is characterized in that
First switch and second switch are the high-speed switch for having the function of to be remotely controlled folding.
3. according to claim 1 it is a kind of consider grid entry point afterflow microgrid is seamless and off-network switching system, which is characterized in that
The AC/DC converters are single stage type converter or stage type converter.
4. according to claim 1 it is a kind of consider grid entry point afterflow microgrid is seamless and off-network switching system, which is characterized in that
The model GMCC-SC-003R0-650 of the super capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721792378.5U CN207603234U (en) | 2017-12-20 | 2017-12-20 | A kind of microgrid for considering grid entry point afterflow is seamless and off-network switching system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721792378.5U CN207603234U (en) | 2017-12-20 | 2017-12-20 | A kind of microgrid for considering grid entry point afterflow is seamless and off-network switching system |
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| CN207603234U true CN207603234U (en) | 2018-07-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108899935A (en) * | 2018-08-16 | 2018-11-27 | 广州供电局有限公司 | And off-network switching equipment and system |
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2017
- 2017-12-20 CN CN201721792378.5U patent/CN207603234U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108899935A (en) * | 2018-08-16 | 2018-11-27 | 广州供电局有限公司 | And off-network switching equipment and system |
| CN108899935B (en) * | 2018-08-16 | 2019-10-18 | 广州供电局有限公司 | And off-network switching equipment and system |
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