CN104300586B - A kind of region intelligent control system and method suitable for photovoltaic power station - Google Patents
A kind of region intelligent control system and method suitable for photovoltaic power station Download PDFInfo
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- CN104300586B CN104300586B CN201410548654.8A CN201410548654A CN104300586B CN 104300586 B CN104300586 B CN 104300586B CN 201410548654 A CN201410548654 A CN 201410548654A CN 104300586 B CN104300586 B CN 104300586B
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- 230000033228 biological regulation Effects 0.000 claims abstract description 22
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- 238000004364 calculation method Methods 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000003750 conditioning effect Effects 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 239000013307 optical fiber Substances 0.000 claims description 3
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- 230000003827 upregulation Effects 0.000 description 5
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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
- H02J3/46—Controlling of the sharing of output between the 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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00019—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using optical means
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- H02J13/0096—
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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
- Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/12—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation
- Y04S10/123—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation the energy generation units being or involving renewable energy sources
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a kind of region intelligent control system and method suitable for photovoltaic power station, using the regulative mode of hierarchical control, the power adjusting task that control centre is handed down to photovoltaic master station distributes to multiple region intelligent control units according to certain allocation algorithm, each intelligent control unit is respectively completed the power adjusting task being each responsible in region again, while will deliver to photovoltaic master station on during the fructufy of power adjusting.This regulative mode can solve the problems, such as that the huge more, arrangement of group string inverter quantity disperses to bring to the power adjusting in power station, mitigate the regulation burden of master station, each intelligent control unit is only responsible for the power adjusting in the region simultaneously, regional is adjusted simultaneously, governing speed and degree of regulation are greatly improved, so as to have wider engineering application value.
Description
Technical field
The invention belongs to new forms of energy control technology field, and in particular to a kind of region intelligence suitable for photovoltaic power station
Can regulator control system and method.
Background technology
In recent years, under the support energetically of national governments, distributed generation technology has obtained quick development, especially has
There are clean environment firendly, pollution-free, widely distributed, renewable photovoltaic generation.Under the support energetically of national policy, China
Photovoltaic power station construction has the wide market space.
Distributed photovoltaic power generation is mostly based on scattered roof installation or architecture-integral, simplicity and energy based on wiring
Source is accessed on the spot using the principle for reducing loss on the spot, in urban distribution network the access of photovoltaic will be scattered and unordered, it is distributed
A large amount of accesses of photovoltaic change original single supply structure, and single power distribution network becomes more power supply architectures.
As photovoltaic power station builds the change of subsidy patterns, i.e., degree of being changed to electricity is subsidized by original power plant construction
Subsidy, user then focus more on the generating efficiency and generated energy of photovoltaic plant.And organize string inverter (being not more than 60kW) and use mould
Blockization is designed, and maximal power tracing function can be realized in the DC terminal of each photovoltaic group string combining inverter, and not between by group string
Module difference and the influence for hiding shadow, while reduce photovoltaic module best operating point and the unmatched situation of inverter, carry significantly
High generated energy；Group string inverter can also solve different directions, different angle, low efficiency problem caused by different zones in addition,
Also can solve to maximize the influence for reducing array off resonance loss to generating efficiency；It can save and conflux when simultaneously using group string inverter
Case, DC cabinet, reduce two failsafe links, substantially increase the reliability of system.Therefore, adopted in photovoltaic power station
Scattered inversion is carried out with group string inverter, concentrates grid-connected pattern to be greatly improved generating efficiency and generated energy.
But such construction mode brings to the power adjusting of photovoltaic plant and string is organized in a series of problem, such as whole station
The increasing number of inverter, group string inverter arrangements are more dispersed, and power adjusting control strategy is more complicated；Inverter is carried out
Data acquisition and control becomes difficult and poor reliability etc..
The content of the invention
It is an object of the invention to provide a kind of region intelligent control system suitable for photovoltaic power station, to solve to adopt
Scattered inverter is carried out with group string inverter, concentrates grid-connected construction mode to be asked to series caused by the power adjusting in power station
Topic, while a kind of regulation and control method using regulator control system is provided.
In order to realize the above object used by the present invention is applied to the region intelligent control system of photovoltaic power station
Technical scheme is as follows：
Photovoltaic master station, power distribution calculating is carried out after the power adjustment instruction issued for receiving control centre and will
Result of calculation is handed down to each corresponding region intelligent control unit；
Region intelligent control unit, including：Data acquisition and procession module, collection photovoltaic plant on the spot equipment data simultaneously
Handled；Stipulations modular converter, stipulations conversion is carried out to the data of the equipment on the spot of collection, for power adjusting, while on
Give photovoltaic master station；Power conditioning module, according to the corresponding power adjustment instruction received in be responsible for region
Group string inverter carry out power adjusting, the common power adjusting task completed control centre and issued.
Communicated between the region intelligent control unit and photovoltaic master station by optical fiber and Ethernet.
Processing of the data acquisition and procession module to the photovoltaic plant that collects data of equipment on the spot includes filtering, precision
Verification, validity check.
The region intelligent control method that the present invention is applied to photovoltaic power station comprises the following steps：
(1) after photovoltaic master station receives the dispatch command that control centre issues, according on each region intelligent control unit
The data for delivering to master station calculate active regulating command to be allocated；
(2) active regulating command progress power distribution to be allocated is calculated to the work(of each region intelligent control unit
Rate regulating command；
(3) each region intelligent control unit corresponding to power adjustment instruction to the group string inverter in be responsible for region
Carry out power adjusting, the common power adjusting task completed control centre and issued.
Photovoltaic master station carries out power distribution to active regulating command to be allocated and calculated using variable capacity ratio point
With algorithm, according to the variable capacity of each intelligent control unit calculated in real time, distributed according to the big region of maximum variable capacity
Principle more than active power carries out the distribution of power adjustment instruction, and calculation formula is as follows：
In formula：PjrefFor the active regulating command to be allocated of j-th of region intelligent control unit；
PmjFor the active power adjustable capacity of j-th of region intelligent control unit；
ΣPmarFor the active power adjustable capacity sum of each regional control unit in whole station；
PDrefFor the active regulating command that photovoltaic plant is to be allocated.
The region intelligent control unit according in the region between the current output of each inverter, optimized working zone, adjust
The regulating command of the section each inverter of Speed allotment makes it be output to desired value.
The step (3), which also includes each region intelligent control unit, to deliver to photovoltaic monitoring on during the fructufy of power adjusting
Main website.
The present invention is applied to the region intelligent control system of photovoltaic power station and method uses the regulation of hierarchical control
Mode, the power adjusting task that control centre is handed down to photovoltaic master station distribute to multiple areas according to certain allocation algorithm
Domain intelligent control unit, each intelligent control unit are respectively completed the power adjusting task being each responsible in region again.This regulation
Mode can solve the problems, such as that the huge more, arrangement of group string inverter quantity disperses to bring to the power adjusting in power station, mitigate master station
Regulation burden, while each intelligent control unit is only responsible for the power adjusting in the region, and regional is adjusted simultaneously, can be significantly
Governing speed and degree of regulation are improved, so as to have wider engineering application value.
Brief description of the drawings
Fig. 1 is the network structure of distributed grid-connected photovoltaic plant；
Fig. 2 is the flow chart of intelligent control power adjusting of the present invention.
Embodiment
Below in conjunction with the accompanying drawings and the present invention is described further specific embodiment.
It is applied to the network knot of the region intelligent control system embodiment of photovoltaic power station for the present invention as shown in Figure 1
Composition, it is related to a kind of distributed grid-connected photovoltaic plant of multizone, as seen from the figure, the system includes：Photovoltaic master station, is used for
Power distribution calculating is carried out after receiving the power adjustment instruction that control centre issues and result of calculation is handed down to each corresponding area
Domain intelligent control unit；Region intelligent control unit, including：Data acquisition and procession module, collection photovoltaic plant organize string on the spot
The data such as the analog quantitys of the equipment such as inverter, kilowatt-hour meter, protection supervisory equipment, switching value, electricity, and be correspondingly processed
(such as filtering, precision checking, validity check)；Stipulations modular converter, stipulations turn are carried out to the data of the equipment on the spot of collection
Change, for power adjusting, while on give photovoltaic master station；Power conditioning module, adjusted according to the corresponding power received
Section instruction carries out power adjusting to the group string inverter in be responsible for region, and the life such as remote regulating, start and stop is issued to a group string inverter
Order, the common power adjusting task completed control centre and issued.
The region intelligent control unit of the present invention mainly establishes bridge between photovoltaic master station and region on the spot equipment
Beam, play a part of " forming a connecting link ", there is important engineering application value in photovoltaic power station.
It can be seen from Fig. 1, the equipment Relatively centralized in each region, but the distance between each region is farther out, therefore pass through light
Fibre is communicated, and each region intelligent control unit carries out data acquisition to equipment on the spot, is then transmitted by optical fiber in arriving at a station
On host exchange；After the power adjustment instruction that photovoltaic master station receives control centre, each region is given also by fiber distribution
Intelligent control unit.
Present invention also offers a kind of region intelligent control method suitable for photovoltaic power station, this method is included such as
Lower step：
(1) after photovoltaic master station receives the dispatch command that control centre issues, according on each region intelligent control unit
The data for delivering to master station calculate active regulating command to be allocated；
The power distribution of the present embodiment calculates and uses variable capacity pro rate algorithm, according to each intelligence calculated in real time
Regulate and control the variable capacity of unit, refer to according to the principle progress power adjusting more than the big region distribution active power of maximum variable capacity
The distribution of order, calculation formula are as follows：
In formula：PjrefFor the active regulating command to be allocated of j-th of region intelligent control unit；
PmjFor the active power adjustable capacity of j-th of region intelligent control unit；
ΣPmarFor the active power adjustable capacity sum of each regional control unit in whole station；
PDrefFor the active regulating command that photovoltaic plant is to be allocated.
(2) active regulating command progress power distribution to be allocated is calculated to the work(of each region intelligent control unit
Rate regulating command；
(3) each region intelligent control unit corresponding to power adjustment instruction to the group string inverter in be responsible for region
Carry out power adjusting, the common power adjusting task completed control centre and issued.
Region intelligent control unit is carried out power adjusting to each inverter and adjusted using a kind of intelligent optimization regulation strategy, intelligence
Control unit receives the power adjustment instruction that master station issues, according to current output, the optimal work of each inverter in the region
Make the factors such as section (unloaded or full load conversion efficiency reduces), governing speed, make optimizing regulation strategy, inverter is by system
Fixed optimizing regulation strategy adjustment power output is to desired value.
Illustrated below with specific example：Assuming that the capacity of photovoltaic power station is 4MWp, it is divided into 3 region intelligence
Unit (RICU), respectively RICU1, RICU2, RICU3 can be regulated and controled, its capacity is respectively 1MWp, 1.5MWp, 1.5MWp, is divided into 8
Individual generator unit, the installed capacity of each generator unit is 0.5MWp, using the 20kW of same specification group string inverter.
Assuming that the active power output of the current photovoltaic power station is 2.5M, 3 RICU current active power output is respectively
600kW, 1000kW, 900kW, the power allowances for next 5 minutes point that scheduling system issues are 3.7M, and control interval is
The active rate of change of 60s, 1min is 1000kW, and the active rates of change of 10min are 10000kW, degree of regulation 100kW.
As shown in Fig. 2 after photovoltaic master station receives dispatch command, master control is delivered to according on each intelligent control unit first
Related data to calculate active regulating command to be allocated be 1200kW, be then calculated 3 according to power distribution algorithm
RICU power adjustment instruction is：P1ref=320kW, P2ref=400kW, P3ref=480kW.
Each RICU adjusts strategy according to intelligent optimization, considers the current output of each inverter in the region, most
The factors such as good operation interval, governing speed distribute the regulating command of each inverter.Such as 2 generator units in RICU1 regions
Inverter EIAJ be 19kW, then it is mark post inverter that can set the inverter 1-1 that wherein output is 19kW, RICU1
Capacitance-adjustable of going up be (19*50-600)=350kW, more than power adjustment instruction, then 320kW up-regulation instruction is distributed to this
2 generator units in region.Adjust strategy according to same intelligent optimization, RICU2 also can a wheel complete 400kW up-regulation
Instruction.But because 1min rates of change are 1000kW, limited by power variation rate, although RICU3 still has the inversion that can be raised
Device, but the limitation of the 1min rates of change requirement due to scheduling, epicycle regulation maximum can only raise 1000kW, therefore RICU3 is the
280kW can only be raised in one wheel, you can up-regulation 280kW to 1180kW, now the output in power station is 3.5M.Then first round regulation knot
Shu Hou, still there is 200kW (3.7M-3.5M) power difference, more than degree of regulation 100kW, three intelligent control units can on
Tune ability is respectively：80kW, 100kW, 320kW, then in the second wheel regulation, due to RICU3 raise ability it is maximum and its
Up-regulation ability can meet power difference, therefore RICU3 is still distributed in the second wheel regulation according to optimizing regulation strategy set in advance
To the generator unit with up-regulation ability, you can complete regulation task, while each region intelligent control unit is by the result of regulation
Master station is delivered in real time.
Above example is only used for helping the core concept for understanding the present invention, it is impossible to the present invention is limited with this, for ability
The technical staff in domain, every thought according to the present invention, the present invention is modified or equivalent substitution, in embodiment
And any change done in application, it should be included in the scope of the protection.
Claims (6)
- A kind of 1. region intelligent control system suitable for photovoltaic power station, it is characterised in that including：Photovoltaic master station, according to each region intelligent control unit after the power adjustment instruction issued for receiving control centre The data sent carry out power distribution calculating and result of calculation are handed down into each corresponding region intelligent control unit；According to real-time meter The variable capacity of the regional intelligent control unit of calculation, the principle more than power is assigned according to the big region of maximum variable capacity Carry out the distribution of power adjustment instruction；Region intelligent control unit, including：Data acquisition and procession module, gather the photovoltaic plant data of equipment and progress on the spot Processing；Stipulations modular converter, stipulations conversion is carried out to the data of the equipment on the spot of collection, for power adjusting, while on give Photovoltaic master station；Power conditioning module, according to the corresponding power adjustment instruction received to the group in be responsible for region Inverter of going here and there carries out power adjusting, and region intelligent control unit is according to the current output of each inverter, optimal work in region Section and governing speed, optimizing regulation strategy is made, the common power adjusting task completed control centre and issued.
- 2. the region intelligent control system according to claim 1 suitable for photovoltaic power station, it is characterised in that：Institute State and communicated between region intelligent control unit and photovoltaic master station by optical fiber and Ethernet.
- 3. the region intelligent control system according to claim 1 or 2 suitable for photovoltaic power station, its feature exists In：Processing of the data acquisition and procession module to the photovoltaic plant that collects data of equipment on the spot include filtering, precision checking, Validity check.
- A kind of 4. region intelligent control method suitable for photovoltaic power station, it is characterised in that this method includes following step Suddenly：(1) after photovoltaic master station receives the dispatch command that control centre issues, delivered to according on each region intelligent control unit The data of master station calculate active regulating command to be allocated；(2) power that active regulating command progress power distribution to be allocated is calculated to each region intelligent control unit is adjusted Section instruction；According to the variable capacity of the regional intelligent control unit calculated in real time, according to the big region of maximum variable capacity It is assigned the distribution that the principle more than power carries out power adjustment instruction；(3) each region intelligent control unit power adjustment instruction corresponding to is carried out to the group string inverter in be responsible for region Power adjusting, the common power adjusting task completed control centre and issued；The region intelligent control unit according in the region between the current output of each inverter, optimized working zone, regulation speed Degree makes optimizing regulation strategy and distributing the regulating command of each inverter makes it be output to desired value.
- 5. the region intelligent control method according to claim 4 suitable for photovoltaic power station, it is characterised in that：Light Volt master station carries out power distribution calculating to active regulating command to be allocated and uses variable capacity pro rate algorithm, according to The variable capacity of each intelligent control unit calculated in real time, more than the big region distribution active power of maximum variable capacity Principle carries out the distribution of power adjustment instruction, and calculation formula is as follows：<mrow> <msub> <mi>P</mi> <mrow> <mi>j</mi> <mi>r</mi> <mi>e</mi> <mi>f</mi> </mrow> </msub> <mo>=</mo> <mfrac> <msub> <mi>P</mi> <mrow> <mi>m</mi> <mi>j</mi> </mrow> </msub> <mrow> <msub> <mi>&Sigma;P</mi> <mrow> <mi>m</mi> <mi>a</mi> <mi>r</mi> </mrow> </msub> </mrow> </mfrac> <mo>&CenterDot;</mo> <msub> <mi>P</mi> <mrow> <mi>D</mi> <mi>r</mi> <mi>e</mi> <mi>f</mi> </mrow> </msub> </mrow>In formula：PjrefFor the active regulating command to be allocated of j-th of region intelligent control unit；PmjFor the active power adjustable capacity of j-th of region intelligent control unit；ΣPmarFor the active power adjustable capacity sum of each regional control unit in whole station；PDrefFor the active regulating command that photovoltaic plant is to be allocated.
- 6. the region intelligent control method suitable for photovoltaic power station according to claim 4~5 any one, its It is characterised by：The step (3), which also includes each region intelligent control unit, to deliver to photovoltaic prison on during the fructufy of power adjusting Control main website.
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| CN105958547A (en) * | 2016-04-28 | 2016-09-21 | 中国电力科学研究院 | Electric power balance scheduling method considering thermoelectric unit limit values |
| CN106532783B (en) * | 2016-11-04 | 2020-04-07 | 东北电力大学 | Distributed photovoltaic coordination control system |
| CN108539801A (en) * | 2018-05-15 | 2018-09-14 | 中国电力科学研究院有限公司 | Power distribution network over-voltage suppressing method and system based on active power High Limit algorithm |
| CN109687481A (en) * | 2018-12-27 | 2019-04-26 | 国网青海省电力公司电力科学研究院 | Photovoltaic plant based on principal and subordinate's coordinated control participates in primary frequency modulation implementation method |
| CN113452082B (en) * | 2021-06-17 | 2023-02-28 | 南方电网科学研究院有限责任公司 | Multi-level power control method for string type photovoltaic power station |
| CN114498936B (en) * | 2022-02-11 | 2024-02-23 | 国网江苏省电力有限公司电力科学研究院 | Distributed power supply regulation and control system, method and device |
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| CN101510686A (en) * | 2009-03-26 | 2009-08-19 | 上海交通大学 | Micro electric network coordination control system based on multi-proxy technology |
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