CN104300586A - Intelligent area regulation and control system and method applicable to distributed photovoltaic power stations - Google Patents
Intelligent area regulation and control system and method applicable to distributed photovoltaic power stations Download PDFInfo
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- CN104300586A CN104300586A CN201410548654.8A CN201410548654A CN104300586A CN 104300586 A CN104300586 A CN 104300586A CN 201410548654 A CN201410548654 A CN 201410548654A CN 104300586 A CN104300586 A CN 104300586A
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- 230000033228 biological regulation Effects 0.000 title abstract description 22
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- 239000013307 optical fiber Substances 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 3
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- 238000012544 monitoring process Methods 0.000 abstract 3
- 238000010276 construction Methods 0.000 description 5
- 239000006185 dispersion Substances 0.000 description 5
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- 238000005457 optimization Methods 0.000 description 3
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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 an intelligent area regulation and control system and method applicable to distributed photovoltaic power stations. A regulating mode of hierarchical control is adopted, power regulating tasks sent down to a photovoltaic monitoring master station by a dispatching center are allocated to a plurality of intelligent area regulation and control units according to a certain allocation algorithm, each intelligent regulation and control unit completes the corresponding power regulation task in the area in the charge of the intelligent regulation and control unit, and meanwhile, power regulation results are sent up to the photovoltaic monitoring master station in real time. The regulation mode can solve the problems caused when group series inverters are very large in number and arranged dispersedly, the regulation load of the monitoring master station is relieved, meanwhile, each intelligent regulation and control unit is only in charge of the power regulation in the corresponding area, all the areas are regulated at the same time, the regulation speed can be greatly increased, the regulation accuracy can be greatly improved, and therefore the system and method can have more extensive engineering application value.
Description
Technical field
The invention belongs to new forms of energy control technology field, be specifically related to a kind of the region intelligent control system and the method that are applicable to distributed photovoltaic power station.
Background technology
In recent years, under the support energetically of national governments, distributed generation technology obtains and develops fast, especially has the photovoltaic generation of clean environment firendly, the advantage such as pollution-free, widely distributed, renewable.Under the support energetically of national policy, China's distributed photovoltaic power plant construction has the wide market space.
Distributed photovoltaic power generation installs mainly with dispersion roof greatly or architecture-integral is main, the principle using on the spot and reduce loss is accessed on the spot based on the simplicity connected up and the energy, in urban distribution network photovoltaic access will be dispersion and unordered, a large amount of accesses of distributed photovoltaic change original single supply structure, and single power distribution network becomes many power supply architectures.
Along with the change of distributed photovoltaic power plant construction subsidy patterns, namely subsidize the subsidy of degree of changing to electricity by original power plant construction, user then pays close attention to generating efficiency and the energy output of photovoltaic plant more.And group string inverter (being not more than 60kW) adopts modularized design, maximal power tracing function can be realized in the DC terminal of each photovoltaic group string combining inverter, and not by module difference between group string and the impact hiding shadow, decrease photovoltaic module best operating point and the unmatched situation of inverter simultaneously, substantially increase energy output; Group string inverter also can solve different from, the low efficiency problem that causes of different angle, zones of different in addition, also can solve to maximize to reduce array off resonance loss to the impact of generating efficiency; Header box, DC cabinet can be saved during the string of employing group simultaneously inverter, decrease two failsafe links, substantially increase the reliability of system.Therefore, in distributed photovoltaic power station, employing group string inverter carries out dispersion inversion, concentrates grid-connected pattern can greatly improve generating efficiency and energy output.
But such construction mode brings a series of problem to the power adjustments of photovoltaic plant, the increasing number of group string inverter in such as whole station, group string inverter arrangements compares dispersion, and power adjustments control strategy is more complicated; Data acquisition and control is carried out to inverter and becomes difficulty and poor reliability etc.
Summary of the invention
The object of this invention is to provide a kind of region intelligent control system being applicable to distributed photovoltaic power station, to solve the series of problems that employing group string inverter carries out disperseing inverter, concentrating grid-connected construction mode to bring to the power adjustments in power station, provide a kind of regulate and control method using regulator control system simultaneously.
In order to realize above object, the technical scheme that the region intelligent control system that the present invention is applicable to distributed photovoltaic power station adopts is as follows:
Photovoltaic master station, for carrying out power division calculating after the power adjustment instruction that receiving scheduling center issues and result of calculation being handed down to the region intelligent control unit of each correspondence;
Region intelligent control unit, comprising: data acquisition and procession module, and the data gathering photovoltaic plant equipment are on the spot gone forward side by side row relax; Protocol transform module, carries out protocol transform to the data of the equipment on the spot gathered, for power adjustments, gives photovoltaic master station simultaneously; Power conditioning module, the power adjustment instruction according to the correspondence received carries out power adjustments to the group string inverter in be responsible for region, jointly completes the power adjustments task that control centre issues.
Communication is carried out by optical fiber and Ethernet between described region intelligent control unit and photovoltaic master station.
The process of data acquisition and procession module to the photovoltaic plant the collected data of equipment on the spot comprises filtering, precision checking, validity check.
The region intelligent control method that the present invention is applicable to distributed photovoltaic power station comprises the steps:
(1), after the dispatch command that photovoltaic master station receiving scheduling center issues, the data according to each region intelligent control unit being delivered to master station calculate meritorious regulating command to be allocated;
(2) power adjustment instruction that power division calculates each region intelligent control unit is carried out in meritorious regulating command to be allocated;
(3) each region intelligent control unit carries out power adjustments according to the power adjustment instruction of correspondence to the group string inverter in be responsible for region, jointly completes the power adjustments task that control centre issues.
Photovoltaic master station carries out power division to meritorious regulating command to be allocated and calculates employing variable capacity pro rate algorithm, according to the variable capacity of each intelligent control unit calculated in real time, carry out the distribution of power adjustment instruction according to the principle that the region allocation active power that maximum variable capacity is large is many, computing formula is as follows:
In formula: P
jreffor the to be allocated meritorious regulating command of a jth region intelligent control unit;
P
mjfor the active power adjustable capacity of a jth region intelligent control unit;
Σ P
marfor the active power adjustable capacity sum of regional control unit each in whole station;
P
dreffor the meritorious regulating command that photovoltaic plant is to be allocated.
Described region intelligent control unit is exerted oneself according to inverter each in this region current, between optimized working zone, the governing speed regulating command that distributes each inverter makes it output to desired value.
Photovoltaic master station is delivered on when described step (3) also comprises the fructufy of each region intelligent control unit by power adjustments.
The present invention is applicable to the region intelligent control system in distributed photovoltaic power station and the regulative mode of method employing hierarchical control, power adjustments task control centre being handed down to photovoltaic master station distributes to multiple regions intelligent control unit according to certain allocation algorithm, and each intelligent control unit completes the power adjustments task be responsible for separately in region more respectively.This regulative mode can solve group string inverter quantity huge many, arrange the problem that dispersion brings to the power adjustments in power station, alleviate the adjustment burden of master station, each intelligent control unit is only responsible for the power adjustments in this region simultaneously, regional regulates simultaneously, can greatly improve governing speed and degree of regulation, thus there is engineer applied value widely.
Accompanying drawing explanation
Fig. 1 is the network structure of distributed grid-connected photovoltaic plant;
Fig. 2 is the flow chart of intelligent control power adjustments of the present invention.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, the present invention is described further.
Be illustrated in figure 1 the network structure that the present invention is applicable to the region intelligent control system embodiment in distributed photovoltaic power station, relate to a kind of distributed grid-connected photovoltaic plant of multizone, as seen from the figure, this system comprises: photovoltaic master station, for carrying out power division calculating after the power adjustment instruction that receiving scheduling center issues and result of calculation being handed down to the region intelligent control unit of each correspondence; Region intelligent control unit, comprise: data acquisition and procession module, gather the data such as analog quantity, switching value, electricity that photovoltaic plant organizes the equipment such as string inverter, kilowatt-hour meter, protection supervisory equipment on the spot, and be correspondingly processed (as filtering, precision checking, validity check etc.); Protocol transform module, carries out protocol transform to the data of the equipment on the spot gathered, for power adjustments, gives photovoltaic master station simultaneously; Power conditioning module, the power adjustment instruction according to the correspondence received carries out power adjustments to the group string inverter in be responsible for region, issues the order such as remote regulating, start and stop, jointly complete the power adjustments task that control centre issues to group string inverter.
Region of the present invention intelligent control unit mainly establishes bridge between equipment on the spot at photovoltaic master station and region, plays the effect of " forming a connecting link ", has important engineer applied and be worth in distributed photovoltaic power station.
According to Fig. 1, the equipment Relatively centralized in each region, but distant between each region, therefore carry out communication by optical fiber, and each region intelligent control unit carries out data acquisition to equipment on the spot, then arrives at a station on interior host exchange by Optical Fiber Transmission; After the power adjustment instruction at photovoltaic master station receiving scheduling center, also give each region intelligent control unit by fiber distribution.
Present invention also offers a kind of region intelligent control method being applicable to distributed photovoltaic power station, the method comprises the steps:
(1), after the dispatch command that photovoltaic master station receiving scheduling center issues, the data according to each region intelligent control unit being delivered to master station calculate meritorious regulating command to be allocated;
The power division of the present embodiment calculates and adopts variable capacity pro rate algorithm, according to the variable capacity of each intelligent control unit calculated in real time, carry out the distribution of power adjustment instruction according to the principle that the region allocation active power that maximum variable capacity is large is many, computing formula is as follows:
In formula: P
jreffor the to be allocated meritorious regulating command of a jth region intelligent control unit;
P
mjfor the active power adjustable capacity of a jth region intelligent control unit;
Σ P
marfor the active power adjustable capacity sum of regional control unit each in whole station;
P
dreffor the meritorious regulating command that photovoltaic plant is to be allocated.
(2) power adjustment instruction that power division calculates each region intelligent control unit is carried out in meritorious regulating command to be allocated;
(3) each region intelligent control unit carries out power adjustments according to the power adjustment instruction of correspondence to the group string inverter in be responsible for region, jointly completes the power adjustments task that control centre issues.
Region intelligent control unit carries out power adjustments to each inverter and adopts a kind of intelligent optimization regulation strategy, intelligent control unit receives the power adjustment instruction that master station issues, exert oneself according to inverter each in this region current, the factor such as (unloaded or full load conversion efficiency reduces), governing speed between optimized working zone, make optimizing regulation strategy, inverter presses the optimizing regulation strategy adjustment power stage of formulation to desired value.
Be described with concrete example below: suppose that the capacity in distributed photovoltaic power station is 4MWp, be divided into 3 regions intelligent control unit (RICU), be respectively RICU1, RICU2, RICU3, its capacity is respectively 1MWp, 1.5MWp, 1.5MWp, be divided into 8 generator units, the installed capacity of each generator unit is 0.5MWp, adopts the group string inverter of the 20kW of same specification.
Suppose that the meritorious of this distributed photovoltaic power station current is exerted oneself as 2.5M, current meritorious the exerting oneself of 3 RICU is respectively 600kW, 1000kW, 900kW, the power allowances of the next one 5 minutes point that dispatching patcher issues is 3.7M, control interval is 60s, 1min rate of change of gaining merit is 1000kW, 10min rate of change of gaining merit is 10000kW, and degree of regulation is 100kW.
As shown in Figure 2, after the instruction of photovoltaic master station receiving scheduling, first calculating meritorious regulating command to be allocated according to the related data each intelligent control unit being delivered to master control is 1200kW, and the power adjustment instruction then calculating 3 RICU according to power distribution algorithm is: P
1ref=320kW, P
2ref=400kW, P
3ref=480kW.
Each RICU according to intelligent optimization regulation strategy, consider each inverter in this region currently to exert oneself, regulating command that best effort interval, the factor such as governing speed distribute each inverter.In such as RICU1 region, the inverter maximum output of 2 generator units is 19kW, then can set the inverter 1-1 wherein exerted oneself as 19kW is mark post inverter, the capacitance-adjustable gone up of RICU1 is (19*50-600)=350kW, be greater than power adjustment instruction, then the rise command assignment of 320kW given 2 generator units in this region.According to same intelligent optimization regulation strategy, RICU2 also can a rise instruction having taken turns 400kW.But because 1min rate of change is 1000kW, by the restriction of power variation rate, although RICU3 still has the inverter that can raise, but due to the restriction that the 1min rate of change of scheduling requires, epicycle adjustment is maximum can only raise 1000kW, therefore RICU3 can only raise 280kW in the first round, can raise 280kW to 1180kW, now the exerting oneself as 3.5M of power station.After then first round adjustment terminates, still have the power difference of 200kW (3.7M-3.5M), be greater than degree of regulation 100kW, the raised ability of three intelligent control unit is respectively: 80kW, 100kW, 320kW, then when second takes turns adjustment, raised ability due to RICU3 is maximum and its rise ability can meet power difference, therefore RICU3 takes turns in adjustment second and still distributes to the generator unit with rise ability according to the optimizing regulation strategy preset, adjustment task can be completed, master station is delivered on simultaneously during the fructufy of each region intelligent control unit by adjustment.
Above embodiment only understands core concept of the present invention for helping; the present invention can not be limited with this; for those skilled in the art; every according to thought of the present invention; the present invention is modified or equivalent replacement; any change done in specific embodiments and applications, all should be included within protection scope of the present invention.
Claims (7)
1. be applicable to the region intelligent control system in distributed photovoltaic power station, it is characterized in that, comprising:
Photovoltaic master station, for carrying out power division calculating after the power adjustment instruction that receiving scheduling center issues and result of calculation being handed down to the region intelligent control unit of each correspondence;
Region intelligent control unit, comprising: data acquisition and procession module, and the data gathering photovoltaic plant equipment are on the spot gone forward side by side row relax; Protocol transform module, carries out protocol transform to the data of the equipment on the spot gathered, for power adjustments, gives photovoltaic master station simultaneously; Power conditioning module, the power adjustment instruction according to the correspondence received carries out power adjustments to the group string inverter in be responsible for region, jointly completes the power adjustments task that control centre issues.
2. the region intelligent control system being applicable to distributed photovoltaic power station according to claim 1, is characterized in that: carry out communication by optical fiber and Ethernet between described region intelligent control unit and photovoltaic master station.
3. the region intelligent control system being applicable to distributed photovoltaic power station according to claim 1 and 2, is characterized in that: the process of data acquisition and procession module to the photovoltaic plant the collected data of equipment on the spot comprises filtering, precision checking, validity check.
4. be applicable to the region intelligent control method in distributed photovoltaic power station, it is characterized in that, the method comprises the steps:
(1), after the dispatch command that photovoltaic master station receiving scheduling center issues, the data according to each region intelligent control unit being delivered to master station calculate meritorious regulating command to be allocated;
(2) power adjustment instruction that power division calculates each region intelligent control unit is carried out in meritorious regulating command to be allocated;
(3) each region intelligent control unit carries out power adjustments according to the power adjustment instruction of correspondence to the group string inverter in be responsible for region, jointly completes the power adjustments task that control centre issues.
5. the region intelligent control method being applicable to distributed photovoltaic power station according to claim 4, it is characterized in that: photovoltaic master station carries out power division to meritorious regulating command to be allocated and calculates employing variable capacity pro rate algorithm, according to the variable capacity of each intelligent control unit calculated in real time, carry out the distribution of power adjustment instruction according to the principle that the region allocation active power that maximum variable capacity is large is many, computing formula is as follows:
In formula: P
jreffor the to be allocated meritorious regulating command of a jth region intelligent control unit;
P
mjfor the active power adjustable capacity of a jth region intelligent control unit;
Σ P
marfor the active power adjustable capacity sum of regional control unit each in whole station;
P
dreffor the meritorious regulating command that photovoltaic plant is to be allocated.
6. the region intelligent control method being applicable to distributed photovoltaic power station according to claim 4, is characterized in that: described region intelligent control unit is exerted oneself according to inverter each in this region current, between optimized working zone, the governing speed regulating command that distributes each inverter makes it output to desired value.
7. the region intelligent control method being applicable to distributed photovoltaic power station according to claim 4 ~ 6 any one, is characterized in that: deliver to photovoltaic master station on when described step (3) also comprises the fructufy of each region intelligent control unit by power adjustments.
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Cited By (6)
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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 |
| CN106532783A (en) * | 2016-11-04 | 2017-03-22 | 东北电力大学 | Distributed photovoltaic coordinated 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 |
| CN113452082A (en) * | 2021-06-17 | 2021-09-28 | 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 |
| CN114498936A (en) * | 2022-02-11 | 2022-05-13 | 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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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| 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 |
| CN113452082A (en) * | 2021-06-17 | 2021-09-28 | 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 |
| 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 |
| CN114498936A (en) * | 2022-02-11 | 2022-05-13 | 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 |
| 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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| CN104300586B (en) | 2018-01-16 |
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