CN108462211A - A method of it improving distributed photovoltaic system and generates power for their own use rate - Google Patents
A method of it improving distributed photovoltaic system and generates power for their own use rate Download PDFInfo
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- CN108462211A CN108462211A CN201810443026.1A CN201810443026A CN108462211A CN 108462211 A CN108462211 A CN 108462211A CN 201810443026 A CN201810443026 A CN 201810443026A CN 108462211 A CN108462211 A CN 108462211A
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000004146 energy storage Methods 0.000 claims abstract description 48
- 238000010248 power generation Methods 0.000 claims abstract description 27
- 230000005611 electricity Effects 0.000 claims abstract description 18
- 238000007599 discharging Methods 0.000 claims abstract description 5
- 238000009825 accumulation Methods 0.000 claims description 19
- 239000004744 fabric Substances 0.000 description 3
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 2
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- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005779 cell damage Effects 0.000 description 1
- 208000037887 cell injury Diseases 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000003828 downregulation Effects 0.000 description 1
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Classifications
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- H02J3/385—
-
- 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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
-
- 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
- H02J3/48—Controlling the sharing of the in-phase component
-
- 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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
-
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
A method of it improving distributed photovoltaic system and generates power for their own use rate.By the way that energy-storage units are added in distributed photovoltaic system, energy-storage units are adjusted to contribute, daytime is to accumulator automatic charging, night is to battery discharging, and distributed photovoltaic system grid connection point invariable power electricity consumption is made using PI controllers, on the basis of ensureing battery, by the mode of energy balancing signal, it realizes that the generated energy of distributed photovoltaic power generation unit is most of to be dissolved by distributed photovoltaic internal system load, improves distributed photovoltaic system and generate power for their own use rate.
Description
Technical field
The present invention relates to a kind of energy storage adjusting methods.
Background technology
As energy problem becomes increasingly conspicuous, photovoltaic industry is grown rapidly.Since photovoltaic energy density is low, centralized photovoltaic electric
It stands mostly in West Region Development, and China's economic center, high power load concentrate on the central and east, directly result in a large amount of photovoltaics in west
Portion influences bulk power grid operation due to sending difficulty outside, abandons optical phenomenon and takes place frequently, serious waste of resources.Standard is renewable to this present situation
The development need of the energy is more focused on dissolving nearby, local use, therefore as photovoltaic installed capacity increases, distributed photovoltaic system
System becomes the direction of photovoltaic development.Distributed photovoltaic system online pattern include：It generates power for their own use, remaining electricity online；Online in full.
But with the sustained down-regulation of mark post rate for incorporation into the power network, distributed photovoltaic system fully surf the Internet income reduction.According to statistics, most domestic
The income that area is fully surfed the Internet, which is generally less than, generates power for their own use, remaining electricity online income, for the high commercial user of electricity price and big industry
User, income of generating power for their own use are higher than remaining electricity online income；So if such user will improve income, it is necessary to improve from from
With rate.And distributed photovoltaic power generation unit installed capacity at present accesses item by user using soil (roof) area and power grid
Part determines that photovoltaic generation is concentrated the daylight preferable period at noon, and the distribution of industry and commerce customer charge whole day is relatively uniform, in this way
Application present situation to directly result in distributed photovoltaic system rate of generating power for their own use low, on photovoltaic generation peak period major part electricity
Net.
To solve the above problems, being currently available that method includes increasing load or increasing energy storage to adjust.Increase load for
The user's operation difficulty of firm demand is larger；And energy storage cost is generally excessively high, but with energy storage cost on the market at present
It constantly reduces, the rate of generating power for their own use of distributed photovoltaic system is improved using energy storage becomes trend.The rate of generating power for their own use refers to point
Distributed photovoltaic power generation unit gross generation subtracts system electricity volume divided by distributed photovoltaic power generation list in cloth photovoltaic system
First gross generation.But in adjusting the application that distributed photovoltaic system generates power for their own use rate by energy storage, currently used method needs
Increase central control system, photovoltaic and energy storage are controlled by coordination contributes and improve distributed photovoltaic system and generate power for their own use rate, calculate
Method is complicated, and cost is higher, and battery is mostly used with filling with the mode put, and so that accumulator is in partial state of charge operation, to storing
Cell damage is larger, reduces service lifetime of accumulator.
Invention content
It is an object of the invention to overcome current distributed photovoltaic system rate of generating power for their own use low, carried using energy storage with filling with putting
The high method from from rate injures great present situation to battery, proposes that a kind of distributed photovoltaic system that improves is generated power for their own use the side of rate
Method.The present invention not only can guarantee battery life but also can improve distributed photovoltaic system and generated power for their own use rate.The present invention is by adjusting energy storage
It contributes and improves distributed photovoltaic system and generate power for their own use rate, steps are as follows：
(1) photovoltaic DC-to-AC converter is controlled, distributed photovoltaic power generation unit maximum power is made to run；
(2) judge whether distributed photovoltaic system time is daytime, and basis for estimation is the distributed photovoltaic current time in system
It is less than or equal to more than or equal to 6 points at 18 points；
If daytime, first determine whether battery tension sets less than battery tension after self discharge in energy-storage units
If value carries out automatic charging, until storing by energy accumulation current converter less than battery tension setting value after self discharge to accumulator
Until battery is full of, accumulator after each discharge can it is at full charge after discharge again, by distributed photovoltaic power generation unit on daytime
The generated energy that cannot be consumed by load is stored in energy-storage units；
If night, the generated energy of distributed photovoltaic power generation unit is zero at this time, makes night point by adjusting energy storage output
Cloth photovoltaic system grid entry point electric power is constant；
It is as follows：
Grid entry point realtime power P is acquired by ammeter firstpcc, then by grid entry point power given value Ppcc_SETWith ammeter
Acquire grid entry point realtime power PpccCompare, comparison result is grid entry point power limitation control error E rr：
Err=Ppcc_SET-Ppcc
When completely dispensing with power grid power supply, grid entry point power given value Ppcc_SETIt is set as 0；
Grid entry point power limitation control error E rr is inputted into digital PI controller, calculates energy accumulation current converter work(in energy-storage units
Rate given value Pb：
Pb=Pb1+kp*(Err-Err1)+ki*Err
In above formula, Pb1For upper controlling cycle energy accumulation current converter power given value, Err1For upper controlling cycle grid entry point
Power limitation control error, kpFor proportionality coefficient, kiFor integral coefficient；
By adjusting energy-storage units output Pb, keep distributed photovoltaic system grid connection point electric power constant in grid entry point power
Given value Ppcc_SET；After energy-storage units electric discharge, judge whether battery tension is less than blanking voltage, if less than if blanking voltage
Accumulator automatic charging is given, until accumulator is full of, ensures that accumulator is only put, protects accumulator；Night is to accumulator
Electric discharge, keeps grid entry point electric power constant, realizes the electricity for storing photovoltaic daytime by energy-storage units, is transferred to night load
It uses, improves distributed photovoltaic system and generate power for their own use rate.
The distributed photovoltaic system is made of distributed photovoltaic power generation unit, load, busbar and grid entry point；Described
Distributed photovoltaic power generation unit and load are connected on busbar, and busbar connects grid entry point, and grid entry point is connect with power grid；It is described
Busbar refer generally to ac bus；The grid entry point refers to the tie point of busbar and power grid in distributed photovoltaic system；Described
Distributed photovoltaic power generation unit is made of photovoltaic module and photovoltaic DC-to-AC converter, photovoltaic component DC side and photovoltaic DC-to-AC converter DC side
Connection, photovoltaic DC-to-AC converter exchange side are connect with busbar；It is negative that the load refers to normal domestic load, Commercial Load or big industry
Lotus；The method improves distributed photovoltaic system and generates power for their own use rate to realize the present invention, needs in distributed photovoltaic system
Energy-storage units are added；The energy-storage units are made of accumulator and energy accumulation current converter, accumulator DC side and energy accumulation current converter
DC side connects, and energy accumulation current converter exchange side is connect with busbar；The rate of generating power for their own use refers to distribution in distributed photovoltaic system
Formula photovoltaic generation unit gross generation subtracts distributed photovoltaic system electricity volume divided by distributed photovoltaic power generation unit always generates electricity
Amount；The automatic charging refers to carries out modified constant-voltage charge to accumulator.
The beneficial effects of the invention are as follows：
This method uses accumulator by the way of discharging again after completely filling, and avoids the operation of battery section state-of-charge,
Improve service lifetime of accumulator.It is charged to accumulator by daytime, it cannot be by distributed photovoltaic system by photovoltaic generation unit
The part of load consumption is stored in energy-storage units.By night to battery discharging, electricity night that energy-storage units are stored daytime
It gives distributed photovoltaic internal system load to use again, energy balancing signal is realized with this, makes the distributed photovoltaic of distributed photovoltaic system
The generated energy of generator unit is most of to be dissolved by distributed photovoltaic internal system load, is improved distributed photovoltaic system and is generated power for their own use
Rate.
Description of the drawings
Fig. 1 is the distributed photovoltaic system topological figure of the present invention；
Fig. 2 is distributed photovoltaic+energy-storage system topological diagram of the present invention；
Fig. 3 is the operational flow diagram of the present invention；
Fig. 4 is the distributed photovoltaic+energy-storage system energy on daytime force and velocity of a current figure of the present invention；
Fig. 5 is the PI controller principle figures of the present invention；
Fig. 6 is distributed photovoltaic+energy-storage system night energy force and velocity of a current figure of the present invention.
Specific implementation mode
It is further illustrated the present invention below in conjunction with the drawings and specific embodiments.
Existing distributed photovoltaic system includes distributed photovoltaic power generation unit, busbar, grid entry point and load, distributed light
Volt system is connect with power grid by grid entry point, as shown in Figure 1.Energy storage list is increased using the distributed photovoltaic system of the present invention
Member, as shown in Figure 2.The distributed photovoltaic system daytime of the present invention is by energy-storage units by the extra electricity of distributed photovoltaic power generation unit
Amount is filled with accumulator, and ensures that battery is full of, and night uses the energy of storage to load, by way of energy balancing signal, carries
High distribution photovoltaic system is generated power for their own use rate.
The distributed photovoltaic system is made of distributed photovoltaic power generation unit, load, busbar and grid entry point；Described
Distributed photovoltaic power generation unit and load are connected on busbar, and busbar connects grid entry point, and grid entry point is connect with power grid；It is described
Busbar refer generally to ac bus；The grid entry point refers to the tie point of busbar and power grid in distributed photovoltaic system；Described
Distributed photovoltaic power generation unit is made of photovoltaic module and photovoltaic DC-to-AC converter, photovoltaic component DC side and photovoltaic DC-to-AC converter DC side
Connection, photovoltaic DC-to-AC converter exchange side are connect with busbar；It is negative that the load refers to normal domestic load, Commercial Load or big industry
Lotus；The method improves distributed photovoltaic system and generates power for their own use rate to realize the present invention, needs in distributed photovoltaic system
Energy-storage units are added；The energy-storage units are made of accumulator and energy accumulation current converter, accumulator DC side and energy accumulation current converter
DC side connects, and energy accumulation current converter exchange side is connect with busbar；The rate of generating power for their own use refers to distribution in distributed photovoltaic system
Formula photovoltaic generation unit gross generation subtracts distributed photovoltaic system electricity volume divided by distributed photovoltaic power generation unit always generates electricity
Amount；The automatic charging refers to carries out modified constant-voltage charge to accumulator.
As shown in figure 3, the step of the method for the present invention, is as follows：
(1) control photovoltaic DC-to-AC converter makes distributed photovoltaic power generation unit maximum power run；
(2) judge whether distributed photovoltaic system time is daytime, and basis for estimation is the distributed photovoltaic current time in system
It is less than or equal to more than or equal to 6 points at 18 points；
If daytime, first determine whether battery tension sets less than battery tension after self discharge in energy-storage units
If value carries out automatic charging, until storing by energy accumulation current converter less than battery tension setting value after self discharge to accumulator
Until battery is full of, accumulator after each discharge can it is at full charge after discharge again, by distributed photovoltaic power generation unit on daytime
The generated energy that cannot be consumed by load is stored in energy-storage units, and energy flow gesture is as shown in Figure 4 in distributed photovoltaic system；
If night, the generated energy of distributed photovoltaic power generation unit is zero at this time, makes night point by adjusting energy storage output
Cloth photovoltaic system grid entry point electric power is constant, and controller uses PI controllers, as shown in Figure 5；
It is as follows：
Grid entry point realtime power P is acquired by ammeter firstpcc, then by grid entry point power given value Ppcc_SETWith ammeter
Acquire grid entry point realtime power PpccCompare, comparison result is grid entry point power limitation control error E rr：
Err=Ppcc_SET-Ppcc
When completely dispensing with power grid power supply, grid entry point power given value Ppcc_SETIt is set as 0；
Grid entry point power limitation control error E rr inputs digital PI controller, calculates energy accumulation current converter power in energy-storage units
Given value Pb：
Pb=Pb1+kp*(Err-Err1)+ki*Err
In above formula, Pb1For upper controlling cycle energy accumulation current converter power given value, Err1For upper controlling cycle grid entry point
Power limitation control error, kpFor proportionality coefficient, kiFor integral coefficient；
By adjusting energy-storage units output Pb, keep distributed photovoltaic system grid connection point electric power constant in grid entry point power
Given value Ppcc_SET；After energy-storage units electric discharge, judge whether battery tension is less than blanking voltage, is given if being less than blanking voltage
Accumulator automatic charging ensures that accumulator is only put, protects accumulator until accumulator is full of；Night puts accumulator
Electricity keeps grid entry point electric power constant, realizes the electricity for storing photovoltaic daytime by energy-storage units, being transferred to night load makes
With improving distributed photovoltaic system and generate power for their own use rate, energy flow gesture is as shown in Figure 6 in distributed photovoltaic system.
The above control strategy execution period 2S is primary, and the grid entry point power collecting period, 1S was primary, and the above strategy becomes in energy storage
It is realized on stream device touch screen；
Make the electricity that distributed photovoltaic power generation unit is sent out substantially all by distributed photovoltaic internal system by above method
Load dissolves, and improves the rate of generating power for their own use of distributed photovoltaic system.
At present in the application for rate of being generated power for their own use by energy storage adjusting distributed photovoltaic system, currently used method needs
Increase central control system, photovoltaic and energy storage are controlled by coordination contributes and improve distributed photovoltaic system and generate power for their own use rate, calculate
Method is more complex, and cost is higher, and battery is mostly used with filling with the mode put, and accumulator is in partial state of charge recycling,
It is larger to accumulator damage, reduce service lifetime of accumulator.Operation reserve of the present invention is simple, it is easy to accomplish, specific strategy can
To realize in energy accumulation current converter, do not have in addition increase equipment.Generally, method using the present invention, cost is relatively low, reliability
Height, fault point is less, on the basis of raising distributed photovoltaic system generates power for their own use rate, by discharging again after completely being filled to accumulator
Occupation mode, can effectively improve service lifetime of accumulator.
Claims (3)
- A kind of method of rate 1. raising distributed photovoltaic system is generated power for their own use, which is characterized in that the method includes following step Suddenly：(1) photovoltaic DC-to-AC converter is controlled, distributed photovoltaic power generation unit maximum power is made to run；(2) judge whether distributed photovoltaic system time is daytime, and basis for estimation is to be more than the distributed photovoltaic current time in system It is less than or equal to equal to 6 points at 18 points；If daytime, first determine whether that whether battery tension is less than battery tension setting value after self discharge in energy-storage units, if Less than battery tension setting value after self discharge, then automatic charging is carried out to accumulator by energy accumulation current converter, until accumulator Until being full of, accumulator after each discharge can it is at full charge after discharge again, cannot by distributed photovoltaic power generation unit on daytime Energy-storage units are stored in by the generated energy of load consumption；If night, the generated energy of distributed photovoltaic power generation unit is zero at this time, keeps night distributed by adjusting energy storage output Photovoltaic system grid entry point electric power is constant.
- The method of rate 2. raising distributed photovoltaic system according to claim 1 is generated power for their own use, which is characterized in that the step In (2), make night distributed photovoltaic system grid connection point electric power is constant to be as follows by adjusting energy storage output suddenly：Grid entry point realtime power P is acquired by ammeter firstpcc, then by grid entry point power given value Ppcc_SETSimultaneously with ammeter acquisition Site realtime power PpccCompare, comparison result is grid entry point power limitation control error E rr：Err=Ppcc_SET-PpccWhen completely dispensing with power grid power supply, grid entry point power given value Ppcc_SETIt is set as 0；Grid entry point power limitation control error E rr is inputted into digital PI controller, energy accumulation current converter power in energy-storage units is calculated and gives Definite value Pb：Pb=Pb1+kp*(Err-Err1)+ki*ErrIn above formula, Pb1For upper controlling cycle energy accumulation current converter power given value, Err1For upper controlling cycle grid entry point perseverance work( Rate controls error, kpFor proportionality coefficient, kiFor integral coefficient；By adjusting energy-storage units output Pb, keep distributed photovoltaic system grid connection point electric power constant given in grid entry point power Value Ppcc_SET；After energy-storage units electric discharge, judge whether battery tension is less than blanking voltage, electric power storage is given if being less than blanking voltage Pond automatic charging ensures that accumulator is only put, protects accumulator until accumulator is full of；Night to battery discharging, makes Grid entry point electric power is constant.
- The method of rate 3. raising distributed photovoltaic system according to claim 1 or 2 is generated power for their own use, which is characterized in that institute The distributed photovoltaic system stated is made of distributed photovoltaic power generation unit, load, busbar and grid entry point；The distributed photovoltaic Generator unit and load are connected on busbar, and busbar connects grid entry point, and grid entry point is connect with power grid；The busbar is general Refer to ac bus；The grid entry point refers to the tie point of busbar and power grid in distributed photovoltaic system；The distributed photovoltaic Generator unit is made of photovoltaic module and photovoltaic DC-to-AC converter, and photovoltaic component DC side is connect with photovoltaic DC-to-AC converter DC side, photovoltaic Inverter ac side is connect with busbar；The load refers to normal domestic load, Commercial Load or big industrial load；To realize this The invention method improves distributed photovoltaic system and generates power for their own use rate, needs that energy storage list is added in distributed photovoltaic system Member；The energy-storage units are made of accumulator and energy accumulation current converter, and accumulator DC side is connect with energy accumulation current converter DC side, Energy accumulation current converter exchange side is connect with busbar；The rate of generating power for their own use refers to distributed photovoltaic power generation list in distributed photovoltaic system First gross generation subtracts distributed photovoltaic system electricity volume divided by distributed photovoltaic power generation unit gross generation；Described is automatic Charging refers to carries out modified constant-voltage charge to accumulator.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109256786A (en) * | 2018-09-21 | 2019-01-22 | 国网青海省电力公司 | A kind of active control method for coordinating of smooth electricity storage station and system |
| CN109494796A (en) * | 2018-11-28 | 2019-03-19 | 北京科诺伟业科技股份有限公司 | A kind of light stores up network control method on the invariable power of micro-grid system |
| CN112531773A (en) * | 2020-11-27 | 2021-03-19 | 合肥阳光新能源科技有限公司 | New energy power generation system and energy regulation and control method and device thereof |
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| US20120262960A1 (en) * | 2009-10-14 | 2012-10-18 | Acciona Energia, S.A. | Solar generation method and system |
| CN103872784A (en) * | 2012-12-07 | 2014-06-18 | 北汽福田汽车股份有限公司 | Energy storage power supply cabinet and on-grid and off-grid power supply systems comprising the same |
| CN104779645A (en) * | 2014-05-08 | 2015-07-15 | 阳光电源股份有限公司 | Photovoltaic power generation system and control method thereof |
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| CN101345500A (en) * | 2008-05-16 | 2009-01-14 | 广东志成冠军集团有限公司 | Photovoltaic power generation system with grid-connected generation, independent power generation and UPS function |
| US20120262960A1 (en) * | 2009-10-14 | 2012-10-18 | Acciona Energia, S.A. | Solar generation method and system |
| CN103872784A (en) * | 2012-12-07 | 2014-06-18 | 北汽福田汽车股份有限公司 | Energy storage power supply cabinet and on-grid and off-grid power supply systems comprising the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109256786A (en) * | 2018-09-21 | 2019-01-22 | 国网青海省电力公司 | A kind of active control method for coordinating of smooth electricity storage station and system |
| CN109256786B (en) * | 2018-09-21 | 2023-08-11 | 国网青海省电力公司 | Active coordination control method and system for optical storage station |
| CN109494796A (en) * | 2018-11-28 | 2019-03-19 | 北京科诺伟业科技股份有限公司 | A kind of light stores up network control method on the invariable power of micro-grid system |
| CN112531773A (en) * | 2020-11-27 | 2021-03-19 | 合肥阳光新能源科技有限公司 | New energy power generation system and energy regulation and control method and device thereof |
| CN112531773B (en) * | 2020-11-27 | 2023-06-30 | 阳光新能源开发股份有限公司 | New energy power generation system and energy regulation and control method and device thereof |
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