CN106058915B - A kind of active based on the more microgrids of single three-phase is grid-connected to leave net method for handover control - Google Patents
A kind of active based on the more microgrids of single three-phase is grid-connected to leave net method for handover control Download PDFInfo
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- H02J3/383—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
Abstract
Net method for handover control is left the invention discloses a kind of active based on the more microgrids of single three-phase is grid-connected, when this method is actively detached from distribution for more microgrids caused by the access of single-phase microgrid the problem of three-phase current unbalance, sets up single-phase microgrid dominant eigenvalues adjusting and three-phase microgrid interconnection adjusts two modules.Single-phase microgrid dominant eigenvalues are adjusted limits single-phase photovoltaic output according to tri-phase unbalance factor, and three-phase balance is kept after making more microgrid off-networks.Three-phase microgrid interconnection is adjusted adjusts target adjustment energy storage power according to dominant eigenvalues, and the dominant eigenvalues between more microgrids and distribution is made to be adjusted to close to zero.The present invention is simple and practical, and the control to dominant eigenvalues can be realized by limitation photovoltaic output and coordination three-phase energy-storage system output.It proposes that a kind of active based on the more microgrids of single three-phase is grid-connected to leave net switchover policy, solves the more microgrids of single three-phase actively grid-connected dominant eigenvalues imbalance problem when leaving network operation.
Description
Technical field
The invention belongs to microgrid and off-network switching field, more particularly to a kind of grid-connected turn of actives based on the more microgrids of single three-phase
Off-network method for handover control.
Background technology
Microgrid is a kind of small-sized electric system combining micro battery, load and power electronic equipment etc..It is micro-
Tie of the power grid as power distribution network and distributed generation resource so that power distribution network need not be directly facing type difference, substantial amounts, dispersion
Access even intermittent distributed generation resource, is the effective way of distributed energy access.Micro-capacitance sensor can be operated in it is grid-connected and
Off-network both of which：The grid-connect mode being incorporated into the power networks with regular distribution net；It is not connected with external bulk power grid or because of certain reason
It disconnects the connection with bulk power grid and is transferred to independently operated off-network pattern.
Switching of the microgrid between simultaneously/two kinds of off-network operational mode will directly affect the safety and stability of micro-capacitance sensor, therefore such as
What ensure micro-capacitance sensor simultaneously/transient stability of off-network handoff procedure and meet power quality and require to be micro-capacitance sensor operation control technology
Critical issue.
It finding by prior art documents, micro-grid system is grid-connected/islet operation pattern seamless switching control strategy
(Chen Jie, Chen Xin, Feng Zhiyang, wait micro-grid systems it is grid-connected/islet operation pattern seamless switching control strategy [J] China motor work
Journey journal, 2014.) propose the improvement Voltage loop adjuster based on law of conservation of energy, alleviate microgrid and during leave because
The problems such as microgrid busbar voltage caused by the saturation of energy accumulation current converter Voltage loop output vibrates.Micro-capacitance sensor fortune based on composite energy storage
(micro-capacitance sensor operational modes of Liu Zhiwen, Xia Wenbo, Liu Ming the wave based on composite energy storage takes over seamlessly the switching control of row mode smooth
Control [J] electric power network techniques, 2013.) power shortage problem unplanned for microgrid and during leaving, it proposes super electricity
Container group and accumulator group are impacted and are vibrated caused by effectively reducing microgrid pattern switching instant as composite energy storage mode.
(Zhang Xuesong, Zhao Bo, Li Peng wait based on the micro- of multi layer control to micro-capacitance sensor operational mode seamless switching strategy based on multi layer control
Operation of power networks pattern seamless switching strategy [J] Automation of Electric Systems, 2015.) based on multi layer control proposition microgrid operational mode
The top level control strategy of switching, and by stringent time cooperation, the grid-connected switch motion moment is made to be cut with microgrid main power source pattern
It is synchronized at the time of changing, to realize the seamless switching of microgrid operational mode.Micro-capacitance sensor takes over seamlessly control method and strategy (Zheng Jing
Macro, Wang Yanting, Li Xingwang wait micro-capacitance sensors to take over seamlessly control method and strategy [J] Automation of Electric Systems, and 2011.) it is directed to
And when leaving in the case of microgrid power shortage is excessive, three segment smoothing switchover policy are proposed, pass through the measure for cutting off secondary load
To ensure seamlessly transitting for handoff procedure.(Li Peng opens with pattern switching control strategy for more more grid entry point structure microgrid designs of microgrid
Deodar, Zhao Bo wait the more grid entry point structure microgrid designs of the more microgrids of and pattern switching control strategy [J] Automation of Electric Systems,
2015.) the more grid entry point structures of more microgrids for containing two micro-capacitance sensors based on three layers of control design case, elaborate 24 of more microgrids
The switchover policy and switching flow of the method for operation, and the islands Lu Xi microgrid demonstration project is combined to carry out policy validation.Distribution network failure
In the case of the analysis of more microgrid interconnection capabilities (in thunder, Chen Qifang, Duan Liming wait more microgrid interconnection capabilities in the case of distribution network failures
Analysis [J] electric power network techniques, 2015.) propose two interconnection criterions based on frequency stabilization and spare capacity regulating power, to
The interconnection capability of more microgrids in the case of assessment distribution network failure.Above-mentioned document is all based on more microgrids of three phase supply standard structure
Pair and off-network switching control strategy study, be directed to the more microgrids of light storage type containing single three-phase and off-network switchover policy expansion
Corresponding theoretical research and experimental verification.
For the above deficiency, the three-phase electricity when present invention is actively detached from distribution for more microgrids caused by the access of single-phase micro-capacitance sensor
Unbalanced problem is flowed, single-phase microgrid dominant eigenvalues is set up and adjusts and three-phase microgrid interconnection two modules of adjusting.It is single-phase micro-
Net dominant eigenvalues are adjusted limits single-phase photovoltaic output according to tri-phase unbalance factor, and three-phase electricity levelling is kept after making more microgrid off-networks
Weighing apparatus.Three-phase microgrid interconnection is adjusted adjusts target adjustment energy storage power according to dominant eigenvalues, makes the connection between more microgrids and distribution
Winding thread power is adjusted to close to zero.
Invention content
The purpose of the present invention is to solve above-mentioned the shortcomings of the prior art, provide a kind of based on single three-phase
The active of more microgrids is grid-connected to leave net method for handover control, and the more microgrid three-phase current unbalance degree of off-network can be made in tolerance interval
It is interior, and switching moment distribution and more microgrids dominant eigenvalues close to zero, leave net to ensure that more microgrids are actively grid-connected
The safety and stability of handoff procedure.
A kind of active based on the more microgrids of single three-phase is grid-connected to leave net method for handover control, includes the following steps：
(1) it is respectively PVnum to set A, B, C phase microgrid photovoltaic quantity in more microgridsA、PVnumB、PVnumC；A, B, C phase are micro-
The interconnection general power of net is respectivelyEach phase interconnection general power, which is sized, isWherein x, y, z ∈ [A, B, C], Pline,minFor in each phase interconnection general power
Minimum value, it is q to enable x phase microgrid photovoltaics numberx, 1≤qx≤PVnumx, qxInitial value be 1；
(2) limitation x phase microgrids qxThe power of a photovoltaic, limits value areIts
InFor x phase microgrids qxThe power allocation factor of a photovoltaic；
(3) judge qxWhether PVnum is greater than or equal tox；If more than or equal to PVnumx, then set photovoltaic in y phase microgrids and compile
Number be qy, 1≤qy≤PVnumy, qyInitial value be 1；If being less than PVnumx, then make qxIncrease by 1, return to step (2) continues to limit
X phase microgrids qxA photovoltaic power；
(4) limitation y phase microgrids qyThe power of a photovoltaic, limits value areIts
InFor y phase microgrids qyThe power allocation factor of a photovoltaic；
(5) judge qyWhether PVnum is greater than or equal toy；If more than or equal to PVnumy, then three-phase microgrid PQ (permanent work(is set
Rate) energy storage number is k, the initial value of k is 1；If being less than PVnumy, then make qyIncrease by 1, return to step (4) limits y phases microgrid the
qyA photovoltaic power；
(6) setting three-phase k-th of PQ energy storage power of microgrid is PBSset,k=βk·Pline,dn, wherein βkFor three-phase microgrid kth
A PQ energy storage power allocation factor, Pline,dnFor the dominant eigenvalues between distribution and more microgrids；K is set to add 1；
(7) judge whether k is more than the quantity of three-phase microgrid PQ energy storageIf k is more thanOnce Pline,dn
Less than setting value Pline,set, then the contact wiretap between more microgrids and distribution is disconnected, while more microgrids will store up preset three-phase
It can be set as off-network main power source, and switch to VF control models, maintain the stabilization of electric voltage frequency after more microgrid off-networks；If k is less thanThen return to step (6) continues the output that three-phase k-th of PQ energy storage of microgrid is arranged.
Further, it is assumed that three-phase microgrid internal loading three-phase equilibrium, when microgrid being taken to power outward dominant eigenvalues be just, if
The dominant eigenvalues of each A phases microgrid are respectivelyA phase microgrid interconnection general powers areWherein,For
I-thAThe sum of all energy storage power in a A phases microgrid,It is i-thAThe sum of all photovoltaic powers in a A phases microgrid,It is i-thAThe sum of all load powers in a A phases microgrid；The dominant eigenvalues of each B phases microgrid are respectivelyB phase microgrid interconnection general powers areWherein,It is i-thBAll energy storage work(in a B phases microgrid
The sum of rate,It is i-thBThe sum of all photovoltaic powers in a B phases microgrid,It is i-thBIt is all negative in a B phases microgrid
The sum of lotus power；The dominant eigenvalues of each C phases microgrid are respectivelyC phase microgrid interconnection general powers
ForWherein,For
I-thCThe sum of all energy storage power in a C phases microgrid,It is i-thCThe sum of all photovoltaic powers in a C phases microgrid,It is i-thCThe sum of all load powers in a C phases microgrid.
Further, in step (2), since x phase microgrids have multiple photovoltaics, photovoltaic limits value by following factor distribute to
Each photovoltaic, power allocation factor are determined by following formula：
Wherein, PVnumxFor the quantity of x phase microgrid photovoltaics,For x phase microgrids qxReal-time work(before a photovoltaic adjusting
Rate.
Further, in step (4), due to there are multiple photovoltaics in y phase microgrids, photovoltaic limits value is distributed by following factor
To each photovoltaic, power allocation factor is determined by following formula：
Wherein, PVnumyFor y phase microgrid photovoltaic quantity,For y phase microgrids qyRealtime power before a photovoltaic adjusting.
Further, in step (6), when k-th of PQ energy storage power of three-phase microgrid is arranged, k-th of the PQ storage of three-phase microgrid
Energy power allocation factor is determined by following formula：
Wherein,For three-phase microgrid PQ energy storage quantity；PBS,kFor k-th of PQ energy storage realtime power；PBSnorm,kIt is
The rated power of k PQ energy storage, if distribution is powered to more microgrids, PBSnorm,kTake the nominal discharge power of k-th of PQ energy storageIf more microgrids, to supplying power allocation, which takes the specified charge power of k-th of PQ energy storagePBSset,kUp and down
Limit value is respectively：
Compared with prior art, the present invention has the following effects that：Actively for more microgrids caused by the access of single-phase micro-capacitance sensor
When being detached from distribution the problem of three-phase current unbalance, sets up single-phase microgrid dominant eigenvalues and adjust and the adjusting of three-phase microgrid interconnection
Two modules.Single-phase microgrid dominant eigenvalues are adjusted limits single-phase photovoltaic output according to tri-phase unbalance factor, makes more microgrid off-networks
After keep three-phase balance.Three-phase microgrid interconnection is adjusted adjusts target adjusting energy storage power according to dominant eigenvalues, makes more
Dominant eigenvalues between microgrid and distribution are adjusted to close to zero.
Description of the drawings
Fig. 1, which is that active is grid-connected, leaves net control flow chart；
Fig. 2 is more microgrid experiment porch topological diagrams；
Fig. 3 is that actively grid-connected leave nets single-phase microgrid waveform；
Fig. 4, which is that active is grid-connected, leaves voltage and current waveform at net three-phase microgrid interconnection；
Fig. 5, which is that active is grid-connected, leaves net three-phase microgrid tank voltage and current waveform.
Specific implementation mode
With reference to embodiment and attached drawing, the present invention is described in further detail, but embodiments of the present invention are not
It is limited to this.
The first step：The active of this example is grid-connected, and to leave net control flow chart as shown in Figure 1.It is assumed that the load in three-phase microgrid
Three-phase equilibrium, dominant eigenvalues are just, if the dominant eigenvalues of each A phases microgrid are respectively when microgrid being taken to power outwardA phase microgrid interconnection general powers areWherein,1≤iA≤nA, the dominant eigenvalues of each B phases microgrid are respectivelyB phase microgrid interconnection general powers areWherein,1≤iB≤nB, the dominant eigenvalues of each C phases microgrid are respectivelyC phase microgrid interconnection general powers areWherein,1≤iC≤nC, set A, B, C phase microgrid photovoltaic of the single-phase microgrid of more microgrids
Quantity be respectively PVnumA、PVnumB、PVnumC；A, the interconnection general power of B, C phase microgrid is respectivelyEach phase interconnection general power, which is sized, is
Wherein x, y, z ∈ [A, B, C], Pline,minFor the minimum value in each phase interconnection general power；
Second step：The dominant eigenvalues of the microgrid of x phases are adjusted to Pline,min.Limit each photovoltaic power of x phase microgrids, limitation
Value is For x phase microgrid photovoltaic power allocation factors, determined by following formula：
Wherein, PVnumxFor x phase microgrid photovoltaic quantity,For x phase microgrids qxRealtime power before a photovoltaic adjusting；
Third walks：The dominant eigenvalues of y phase microgrids are adjusted to Pline,min.Limit each photovoltaic power of y phase microgrids, limits value
ForWhereinFor y phase microgrids qyA photovoltaic power allocation factor is by following formula
It determines：
Wherein, PVnumyFor y phase microgrid photovoltaic quantity,For y phase microgrids qyRealtime power before a photovoltaic adjusting；
4th step：Dominant eigenvalues between more microgrids and distribution are adjusted to close to zero.Three-phase k-th of PQ energy storage of microgrid is set
It is P to contributeBSset,k=βk·Pline,dn, wherein βkFor three-phase energy storage power allocation factor, determined by following formula：
Wherein,For three-phase microgrid PQ energy storage quantity；PBS,kFor k-th of PQ energy storage realtime power；PBSnorm, kIt is
The rated power of k PQ energy storage, if distribution is powered to more microgrids, PBSnorm,kTake the nominal discharge power of k-th of PQ energy storageIf more microgrids, to supplying power allocation, which takes the specified charge power of k-th of PQ energy storagePBSset,kUp and down
Limit value is respectively：
5th step：When dominant eigenvalues adjusting makes more microgrids be less than setting value P with distribution dominant eigenvaluesline,setWhen, it is fast
Between more microgrids and distribution and off-network switching switch is opened in quick-break, while the scheduled three-phase energy storage of more microgrids is set as main power source, cuts
VF control models are shifted to, the electric voltage frequency of the support more microgrids of isolated island is stablized.
Being based on single more microgrids of three-phase to the one kind proposed based on more microgrid experiment porch, actively the grid-connected net that leaves switches control
Method processed is verified.Before active off-network, distribution is filled to more microgrid transmission power 2kW, three-phase photovoltaic power 7kW, three-phase energy storage
Electrical power 5kW, three-phase load power 6kW.Single-phase microgrid is to three-phase microgrid busbar transmission power 2kW.
As shown in Figure 3：It is zero by limiting single-phase photovoltaic power to adjust single-phase microgrid dominant eigenvalues.
From Fig. 4,5：It is 1kW by the way that three-phase energy storage charge power is arranged, makes the interconnection between three-phase microgrid and distribution
Power is close to zero.
When three-phase microgrid and the dominant eigenvalues of distribution are less than setting value, micro-capacitance sensor central controller sends separating brake and refers to
It enables, while to preset three-phase energy storage sending mode conversion instruction, switching to VF control models.Actively switch known to Fig. 4,5
Process is smaller to the electric voltage frequency impact of more microgrids.
Simulation result confirms that institute extracting method the more microgrids of single three-phase can be solved that actively grid-connected to leave net dominant eigenvalues uneven
Problem.
It is grid-connected to a kind of active based on the more microgrids of single three-phase provided by the present invention above to leave net method for handover control
It is described in detail, principle and implementation of the present invention are described for specific case used herein, the above reality
The explanation for applying example is merely used to help understand the method and its core concept of the present invention；Meanwhile for the general technology of this field
Personnel, according to the thought of the present invention, there will be changes in the specific implementation manner and application range, in conclusion this theory
Bright book content should not be construed as limiting the invention.
Claims (5)
1. a kind of active based on the more microgrids of single three-phase is grid-connected to leave net method for handover control, it is characterised in that including walking as follows
Suddenly：
(1) it is respectively PVnum to set A, B, C phase microgrid photovoltaic quantity in more microgridsA、PVnumB、PVnumC；A, B, C phase microgrid
Interconnection general power is respectivelyEach phase interconnection general power, which is sized, isWherein x, y, z ∈ [A, B, C], Pline,minFor in each phase interconnection general power
Minimum value, it is q to enable x phase microgrid photovoltaics numberx, 1≤qx≤PVnumx, qxInitial value be 1；
(2) limitation x phase microgrids qxThe power of a photovoltaic, limits value areWhereinFor x phase microgrids qxThe power allocation factor of a photovoltaic；
(3) judge qxWhether PVnum is greater than or equal tox；If more than or equal to PVnumx, then photovoltaic number q in y phase microgrids is enabledy, 1
≤qy≤PVnumy, qyInitial value be 1；If being less than PVnumx, then make qxIncrease by 1, return to step (2) continues to limit x phase microgrids
QxA photovoltaic power；
(4) limitation y phase microgrids qyThe power of a photovoltaic, limits value areWhereinFor y phase microgrids qyThe power allocation factor of a photovoltaic；
(5) judge qyWhether PVnum is greater than or equal toy；If more than or equal to PVnumy, then three-phase microgrid PQ energy storage number is set
Initial value for k, k is 1；If being less than PVnumy, then make qyIncrease by 1, return to step (4) continues to limit y phase microgrids qyA photovoltaic
Power；
(6) setting three-phase k-th of PQ energy storage power of microgrid is PBSset,k=βk·Pline,dn, wherein βkFor k-th of PQ of three-phase microgrid
Energy storage power allocation factor, Pline,dnFor the dominant eigenvalues between distribution and more microgrids；K is set to add 1；
(7) judge whether k is more than the quantity of three-phase microgrid PQ energy storageIf k is more thanOnce Pline,dnIt is less than
Setting value Pline,set, then disconnect the contact wiretap between more microgrids and distribution, at the same more microgrids using preset three-phase energy storage as
Off-network main power source switches to VF control models, maintains the stabilization of electric voltage frequency after more microgrid off-networks；If k is less thanThen
Return to step (6) continues the power that three-phase k-th of PQ energy storage of microgrid is arranged.
2. a kind of active based on the more microgrids of single three-phase according to claim 1 is grid-connected to leave net method for handover control, feature
It is：In step (1), it is assumed that three-phase microgrid internal loading three-phase equilibrium, dominant eigenvalues are just, if each A phases when microgrid being taken to power outward
The dominant eigenvalues of microgrid are respectivelyA phase microgrid interconnection general powers are
Wherein, It is i-thAAll storages in a A phases microgrid
The sum of energy power,It is i-thAThe sum of all photovoltaic powers in a A phases microgrid,It is i-thAOwn in a A phases microgrid
The sum of load power；The dominant eigenvalues of each B phases microgrid are respectivelyB phase microgrid interconnection total works
Rate isWherein,
It is i-thBThe sum of all energy storage power in a B phases microgrid,It is i-thBThe sum of all photovoltaic powers in a B phases microgrid,It is i-thBThe sum of all load powers in a B phases microgrid；The dominant eigenvalues of each C phases microgrid are respectivelyC phase microgrid interconnection general powers areWherein, It is i-thCAll energy storage work(in a C phases microgrid
The sum of rate,It is i-thCThe sum of all photovoltaic powers in a C phases microgrid,It is i-thCIt is all negative in a C phases microgrid
The sum of lotus power.
3. a kind of active based on the more microgrids of single three-phase according to claim 1 is grid-connected to leave net method for handover control,
It is characterized in that：In step (2), since x phase microgrids there are multiple photovoltaics, photovoltaic limits value is distributed by following factor to each light
Volt, power allocation factor are determined by following formula：
Wherein, PVnumxFor the quantity of x phase microgrid photovoltaics,For x phase microgrids qxRealtime power before a photovoltaic adjusting.
4. a kind of active based on the more microgrids of single three-phase according to claim 1 is grid-connected to leave net method for handover control,
It is characterized in that：In step (4), due to there are multiple photovoltaics in y phase microgrids, photovoltaic limits value is distributed by following factor to each light
Volt, power allocation factor are determined by following formula：
Wherein, PVnumyFor y phase microgrid photovoltaic quantity,For y phase microgrids qyRealtime power before a photovoltaic adjusting.
5. a kind of active based on the more microgrids of single three-phase according to claim 1 is grid-connected to leave net method for handover control,
It is characterized in that：In step (6), when k-th of PQ energy storage power of three-phase microgrid is arranged, k-th of PQ energy storage power of three-phase microgrid point
It is determined by following formula with factor：
Wherein, PBS,kFor k-th of PQ energy storage realtime power；PBSnorm,kFor the rated power of k-th of PQ energy storage, if distribution is to mostly micro-
Net is powered, then PBSnorm,kTake the nominal discharge power of k-th of PQ energy storageIf more microgrids take to supplying power allocation, the value
The specified charge power of k-th of PQ energy storagePBSset,kUpper lower limit value is respectively：
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| CN201610372969.0A CN106058915B (en) | 2016-05-30 | 2016-05-30 | A kind of active based on the more microgrids of single three-phase is grid-connected to leave net method for handover control |
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Application publication date: 20161026 Assignee: Guangzhou Development Zone Yuedian new energy Co.,Ltd. Assignor: SOUTH CHINA University OF TECHNOLOGY Contract record no.: X2023980036273 Denomination of invention: A Control Method for Active Grid to Grid Off Switching Based on Single Three Phase Multiple Microgrids Granted publication date: 20180914 License type: Common License Record date: 20230615 |